AP EAPCET 2025 - 23rd May Morning Shift
Paper was held on Fri, May 23, 2025 3:30 AM
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Chemistry

1

The radius of fourth orbit in $\mathrm{He}^{+}$ion is ' $R_1{ }^{\prime} \mathrm{pm}$ and radius of third orbit in $\mathrm{Li}^{2+}$ ion is ' $R_2{ }^{\prime} \mathrm{pm}$. The value of ( $R_1-R_2$ ) in pm is

2

The de-Broglie wavelengths of two fast moving particles $X, Y$ are $1 \mathrm{~nm}, 3 \mathrm{~nm}$ respectively. Mass of $X$ is nine times the mass of $Y$. The ratio of kinetic energies of $X, Y$ is

3

Electronic configurations of four elements $A, B, C, D$ are given below

(A) $1 s^2 2 s^2 2 p^6 3 s^1$

(B) $1 s^2 2 s^2 2 p^6 3 s^2 3 p^1$

(C) $1 s^2 2 s^2 2 p^6 3 s^2$

(D) $1 s^2 2 s^2 2 p^6 3 s^2 3 p^2$

The correct order of first ionisation enthalpy of these elements is

4

A molecules has T -shape. The total number of electron pairs in the valence shell of central atom of it is

5
The sum of bond order values of $\mathrm{C}_2$ and $\mathrm{O}_2^{2+}$ is $x$, which is equal to sum of bond order values of $a, b$ and $c$. What are $a, b$ and $c$ ?
6
At $27^{\circ} \mathrm{C}$ kinetic energy of 4 g of $\mathrm{H}_2$ is $x \mathrm{~J}$. What is the kinetic energy (in J ) of 6.4 g of oxygen at $127^{\circ} \mathrm{C}$ ?
7

At $T(\mathrm{~K})$, hydrogen and oxygen gases are mixed in the ratio of $1: 2$ by mass in a closed vessel of volume ' $V$ ' litres. If the total pressure of gaseous mixture is ' $p$ ' atm, the partial pressure of oxygen (in atm) is

8

Which one of the following reactions is not feasible?

9

For which reaction $\Delta H \neq \Delta U ?$

10

At $298 \mathrm{~K}, \Delta_r U^{\ominus}$ and $\Delta_r S^{\ominus}$ for the following reaction are -10.5 kJ and $+44.1 \mathrm{JK}^{-1} ; 2 X(\mathrm{~g})+Y(\mathrm{~g}) \longrightarrow 2 Z(\mathrm{~g})$ What is $\Delta_r G^{\ominus}$ (in kJ ) for this reaction? $\left(R=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}\right)$

11

Consider the following gaseous equilibrium reactions (I), (II) and (III) with equilibrium constants $K_1, K_2$ and $K_3$ respectively

(I) $\frac{1}{2} \mathrm{~N}_2+\frac{3}{2} \mathrm{H}_2 \rightleftharpoons \mathrm{NH}_3$

(II) $2 \mathrm{NO} \rightleftharpoons \mathrm{N}_2+\mathrm{O}_2$

(III) $\mathrm{H}_2+\frac{1}{2} \mathrm{O}_2 \rightleftharpoons \mathrm{H}_2 \mathrm{O}$

The correct expression for the equilibrium constant for the gaseous equilibrium reaction

$$ 2 \mathrm{NH}_3+\frac{5}{2} \mathrm{O}_2 \rightleftharpoons 2 \mathrm{NO}+3 \mathrm{H}_2 \mathrm{O} \text { is } $$

12
When 30 mL of $0.2 \mathrm{M} \mathrm{NH}_4 \mathrm{OH}$ is added to 30 mL of $2 \mathrm{M} \mathrm{NH}_4 \mathrm{Cl}$ solution. If the pH of the buffer formed is 8.2, what is the $\mathrm{p} K_b$ of $\mathrm{NH}_4 \mathrm{OH}$ ?
13
Which set of elements form electron precise hydrides?
14
The correct order of density of $\mathrm{Be}, \mathrm{Mg}, \mathrm{Ca}, \mathrm{Sr}$ is
15

Identify the reaction in which diborane is produced on industrial scale?

16
Which of the following properties is not correct for silicones?
17

$$ \text { Match the following } $$

List-I
(Pollutant concentration limit in water)
List-II
(Effect)
(A) $$
\mathrm{Pb}>50 \mathrm{ppm}
$$
(I) Brown mottling of teeth
(B) $$
\mathrm{SO}_4^{2-}>500 \mathrm{ppm}
$$
(II) 'Blue baby' syndrome
(C) $$
\mathrm{NO}_3^{-}>50 \mathrm{ppm}
$$
(III) Laxative effect
(D) $$
\mathrm{F}^{-}>2 \mathrm{ppm}
$$
(IV) Liver damage
The correct answer is
18
The element whose percentage composition in an organic compound can be determined by Carius method is
19
' $x$ ' mg of an organic compound was analysed by Kjeldahl method. The ammonia evolved was absorbed in 50 mL of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{SO}_4$. The unused acid required 60 mL of 0.5 M NaOH solution for complete neutralisation. If the percentage of nitrogen in the compound is 56 , the value of $x$ is
20
The composition of a sample of wustite is $\mathrm{Fe}_{0.93} \mathrm{O}_{1.00}$. Percentage of iron in the form of $\mathrm{Fe}^{3+}$ ion is nearly
21
A solution of urea in water has a boiling point or $100.18^{\circ} \mathrm{C}$. What is the freezing point of the same solution, if $K_f$ and $K_b$ of water are 1.86 and 0.52 K kg $\mathrm{mol}^{-1}$.
22

At $T(\mathrm{~K})$, the vapour pressure of pure benzene and toluene are 75 and 22 mm Hg respectively. 23.4 g of benzene and 64.4 g of toluene are mixed to form an ideal solution. If the vapours are in equilibrium with the liquid mixture, the mole fraction of toluene in vapour phase (At.wt. of $\mathrm{C}=12, \mathrm{H}=1$ )

23

At 298 K , the following reaction takes place for a cell at the hydrogen electrode

$$ \mathrm{H}^{+}(a q)+e^{-} \longrightarrow \frac{1}{2} \mathrm{H}_2 \text { (1 bar) } $$

The solution pH is 10.0 . What is the hydrogen electrode potential in volts?

$$ \left(\frac{2303 R T}{F}=0.06 \mathrm{~V}\right) $$

24
$A \rightarrow B$ is a first order reaction. The concentration of $A$ is decreased from $x \mathrm{~mol} \mathrm{~L}^{-1}$ to $y \mathrm{~mol} \mathrm{~L}^{-1}$ in 100 min . What is the average velocity of the reaction in $\mathrm{mol} \mathrm{L}^{-1} \min ^{-1}$ ?
25
The adsorption of a gas on a solid surface follows Freundlich adsorption isotherm. At $T(\mathrm{~K})$, the gas pressure is 2 atm . What is the value of $\frac{x}{m} ?(n=2$ and $k=$ constant $)$
26
Which one of the following acts as autocatalyst during titration of $\mathrm{KMnO}_4$ and oxalic acid in presence of dilute $\mathrm{H}_2 \mathrm{SO}_4$ ?
27

Consider the following.

Statement-I In the extraction of Al by Hall-Heroult process, pure $\mathrm{Al}_2 \mathrm{O}_3$ mixed with $\mathrm{Na}_3 \mathrm{AlF}_6$ lowers its melting point and increases conductivity.

Statement-II Zirconium metal is purified by zone refining method.

The correct answer is

28

Which of the following is not correct?

29
The amphoteric oxide of vanadium ( V ) reacts with alkali and forms an oxo ion ' $X$ ' and with acid forms an oxo ion $Y$. The oxidation states of ' V ' in $X$ and $Y$ are respectively
30

In which one of the following complexes the metal ion has $t_{2 g}^3 e_g^2$ configuration?

31

$$ \text { Match the following. } $$

AP EAPCET 2025 - 23rd May Morning Shift Chemistry - Polymers Question 4 English 1AP EAPCET 2025 - 23rd May Morning Shift Chemistry - Polymers Question 4 English 2

Correct answer is

32

Consider the following

Statement-I Primary structure of protein represents its constitution.

Statement-II $\alpha$-Helix and $\beta$-pleated sheet structure of protein represent tertiary structure of it.

Correct answer is

33

The structure of the product ' $Z$ ' in the reaction sequence is

AP EAPCET 2025 - 23rd May Morning Shift Chemistry - Aldehyde and Ketone Question 7 English
34

$$ \text { Match the following. } $$

$$ \begin{array}{llll} \hline & \text { List-I (Drugs) } & & \text { List-II (Effect) } \\ \hline \text { (A) } & \text { Equanil } & \text { (I) } & \text { Hypnotic } \\ \hline \text { (B) } & \text { Furacine } & \text { (II) } & \text { Antacid } \\ \hline \text { (C) } & \text { Tegamet } & \text { (III) } & \text { Antiseptic } \\ \hline \text { (D) } & \text { Veronal } & \text { (IV) } & \text { To control hypertension } \\ \hline \end{array} $$

Correct answer is

35

The reaction of benzene diazonium chloride with Cu and HCl is known as

36
Identify the correct set from the following
37

In the given reaction sequence, conversion of $X$ to $Y$ is an example of

AP EAPCET 2025 - 23rd May Morning Shift Chemistry - Aldehyde and Ketone Question 8 English
38
IUPAC names of mesityl oxide and oxalic acid are respectively.
39

Which one of the following compounds does not give benzoic acid when treated with alkaline $\mathrm{KMnO}_4$ ?

40

The sequence of reagents required to convert aniline to benzoic acid is

Mathematics

1

The range of the real valued function $f(x)=\cos ^{-1}\left(\frac{3}{\sqrt{9 x^2-12 x+22}}\right)$ is

2

$$ \text { Consider the following statements. } $$

$$ \begin{array}{cl} \hline \text { Statement I } & \begin{array}{l} \text { A function } f: A \rightarrow B \text { is said to be one-one if and } \\ \text { only if } f(x) \neq f(y) \Rightarrow x \neq y \end{array} \\ \hline \text { Statement II } & \begin{array}{l} \text { A relation } f: A \rightarrow B \text { is said to be a function if } x \neq y \\ \Rightarrow f(x) \neq f(y) \end{array} \\ \hline \end{array} $$

Then, which one of the following is true?

3

If $t_n=\frac{1}{4}(n+2)(n+3), n \in N$, then which one of the following is true?

Assertion (A) $\frac{1}{t_1}+\frac{1}{t_2}+\ldots+\frac{1}{t_{2003}}=\frac{2003}{3009}$

Reason (R) $\frac{1}{t_1}+\frac{1}{t_2}+\ldots+\frac{1}{t_n}=\frac{4 n}{(2 n+3)}$

4

  • $A=\left[\begin{array}{ccc}0 & k & k \\ k & -4 & -6 \\ k & -3 & -5\end{array}\right]$ is a singular matrix for
  • 5

    If $A=\left[\begin{array}{ccc}1 & 2 & x \\ 4 & -1 & 7 \\ 2 & 4 & -6\end{array}\right]$ and the rank of $A$ is 2 , then the value of $x$ is equal to

    6

    $$ \left|\begin{array}{ll} 2 & 1 \\ 3 & 1 \end{array}\right|+\left|\begin{array}{cc} 1 & \frac{1}{3} \\ 3 & 1 \end{array}\right|+\left|\begin{array}{cc} \frac{1}{2} & \frac{1}{9} \\ 3 & 1 \end{array}\right|+\left|\begin{array}{cc} \frac{1}{4} & \frac{1}{27} \\ 3 & 1 \end{array}\right|+\ldots \infty= $$

    7

    For any two non-zero complex numbers $z_1$ and $z_2$, if $\left|z_1+z_2\right|^2=\left|z_1\right|^2+\left|z_2\right|^2$, then

    8

    If $1, \omega, \omega^2$ are the cube roots of unity, then

    $$ 1\left(2+\frac{1}{\omega}\right)\left(2+\frac{1}{\omega^2}\right)+2\left(3+\frac{1}{\omega}\right)\left(3+\frac{1}{\omega^2}\right) +3\left(4+\frac{1}{\omega}\right)\left(4+\frac{1}{\omega^2}\right)+\ldots 10 \text { terms }= $$

    9

    $$ (1+\sqrt{3} i)^6-(\sqrt{3}+i)^6= $$

    10

    If $\alpha, \beta$ are the roots of the equation $x^2+b x+c=0$ satisfying the conditions $\alpha+\beta=5$ and $\alpha^3+\beta^3=60$, then $3 c+2=$

    11

    If $\frac{1}{2} \leq \frac{x^2+x+a}{x^2-x+a} \leq 2 \forall x \in R$, then $a=$

    12

    If $\alpha, \beta, \gamma$ are the roots of the equation,

    $$ \begin{aligned} & x^3+a x^2+b x+c=0, \text { then }(\alpha+\beta-2 \gamma) \\ & (\beta+\gamma-2 \alpha)(\gamma+\alpha-2 \beta)= \end{aligned} $$

    13

    If the sum of two roots of the equation $x^4+2 x^3-7 x^2-8 x+12=0$ is zero, then the sum of the squares of the other two roots is

    14

    If 3 sisters and 8 brothers are together playing a game, then the number of ways in which all the sisters and brothers are to be seated around a circle such that all the three sisters are not seated together is

    15

    Out of 8 students in a classroom, 4 of them are chosen and they are arranged around a table.

    If the remaining 4 are arranged in a row, then the total number of arrangements that can be made with those 8 students is

    16

    The sum of all integers between 1 and 100 (both inclusive) which are divisible by 5 or 13 is

    17

    If the coefficients of $x^{10}$ and $x^{11}$ in the expansion of $\left(1+\alpha x+\beta x^2\right)(1+x)^{11}$ are 396 and 144 respectively, then $\alpha^2+\beta^2=$

    18

    If $-\frac{2}{3} < x < \frac{2}{3}$, then the value of the 5 th term in the expansion of $\frac{1}{\sqrt[3]{2-3 x}}$ when $x=\frac{1}{2}$ is

    19

    If $x>\sqrt{3}$ and $\frac{x^2+1}{\left(x^2+2\right)\left(x^2+3\right)}$ is expanded in terms of powers of $x$, then the coefficient of $x^{-8}$ is

    20

    If $\alpha$ is the maximum value and $\beta$ is the minimum value of $\cos ^2 \frac{x}{4}+\sin \frac{x}{4}, x \in R$, then $\alpha-\beta=$

    21

    If $A$ and $B$ are positive acute angles satisfying $3 \cos ^2 A+2 \cos ^2 B=4$ and $\frac{3 \sin A}{\sin B}=\frac{2 \cos B}{\cos A}$, then $A+2 B=$

    22

    If $\sin x-\sin y=\frac{27}{65}$ and $\cos x-\cos y=\frac{-21}{65}$, then $\sin (x+y)=$

    23

    The number of solutions of the equation $\sec x \cdot \cos 5 x+1=0$ in the interval $[0,2 \pi]$ is

    24

    If the equation $2 \cot ^{-1}\left(x^2+2 x+k\right)=\pi-3 \tan ^{-1} \left(x^2+2 x+k\right)$ has two distinct real solutions, then all the values of $k$ lie in the interval

    25

    $$ \sec h^{-1}(\sin \alpha)= $$

    26

    In $\triangle A B C$ if $\cos A \cos B+\sin A \sin B \sin C=1$, then $\sin A+\sin B+\sin C=$

    27
    In $\triangle A B C$, if $a: b: c=4: 5: 6$, then $\frac{\cos A+3 \cos C}{\cos B}=$
    28

    In $\triangle A B C$, if $a=6, b=8$ and $c=10$, then $\frac{2 r_2 r_3}{r r_1}=$

    29

    If the vectors $2 \hat{\mathbf{i}}+3 \hat{\mathbf{j}}+l \hat{\mathbf{k}},-3 \hat{\mathbf{i}}-2 \hat{\mathbf{j}}-4 l \hat{\mathbf{k}}$ and $\hat{\mathbf{i}}-\hat{\mathbf{j}}+3 / \hat{\mathbf{k}}$ form a right-angled triangle for a positive value of $l$, then the length of its hypotenuse is

    30

    A unit vector that is perpendicular to the vector $2 \hat{\mathbf{i}}-\hat{\mathbf{j}}+2 \hat{\mathbf{k}}$ and coplanar with the vectors $\hat{\mathbf{i}}+\hat{\mathbf{j}}-\hat{\mathbf{k}}$ and $2 \hat{\mathbf{i}}+2 \hat{\mathbf{j}}-\hat{\mathbf{k}}$ is

    31
    If the vectors $2 \hat{\mathbf{i}}-\hat{\mathbf{j}}+3 \hat{\mathbf{k}}, \hat{\mathbf{i}}+4 \hat{\mathbf{j}}+\hat{\mathbf{k}}, 4 \hat{\mathbf{i}}+p \hat{\mathbf{j}}+\hat{\mathbf{k}}$ are coplanar, then $p=$
    32

    If the magnitudes of $\mathbf{a}, \mathbf{b}$ and $\mathbf{a}+\mathbf{b}$ are respectively 3,4 and 5 , then the magnitude of $\mathbf{a}-\mathbf{b}$ is

    33

    If $\hat{\mathbf{i}}+\hat{\mathbf{j}}-\hat{\mathbf{k}},-\hat{\mathbf{i}}+2 \hat{\mathbf{j}}+\hat{\mathbf{k}}, \hat{\mathbf{j}}+2 \hat{\mathbf{k}}, 2 \hat{\mathbf{i}}-\hat{\mathbf{j}}+2 \hat{\mathbf{k}}$ are the position vectors of four points $A, B, C, D$ respectively, then the shortest distance between the lines $A B$ and $C D$ is

    34

    The mean and variance of the observations $x_1, x_2, x_3 \ldots x_{15}$ are respectively 2 and 4 . If the mean and variance of the observations $y_1, y_2 \ldots, y_{10}$ are respectively 2 and 5 , then the variance of the observations $x_1, x_2 \ldots, x_{15}, y_1, y_2 \ldots, y_{10}$ is

    35
    If 3 squares are chosen at random from the 64 squares of a chess board, then the probability that all of them lie along the same diagonal line is
    36

    Three letters are chosen at random from the letters of the word VARIABLE and all possible three letter words (with or without meaning) are formed with them.

    Then, the probability of getting a three letter word having a consonent as its middle letter is

    37
    In a shoe rack there are 4 pairs of shoes and 4 shoes. are drawn one after the other at random without replacement. Then, the probability of getting atleast one correct pair of shoes among the four shoes drawn is
    38
    A rational number is selected at random from the distinct rational numbers of the form $p / q$ formed with $p$ and $q$ belonging to the set $\{1,2,3,4,5,6\}$. The probability that the rational number selected is a proper fraction, is
    39

    The probability distribution of a discrete random variable $X$ is given below

    $$ \begin{array}{lllll} \hline X=x & -1 & 0 & 1 & 2 \\ \hline P(X=x) & \frac{1}{3} & \frac{1}{6} & \frac{1}{6} & \frac{1}{3} \\ \hline \end{array} $$

    Then, the value of $6 \sum\left(x^2\right) P(X=x)-\operatorname{var}(X)=$

    40

    If the average number of accidents occurring at a particular junction on a highway in a week is 5 , then the probability that atmost one accident occurs in a particular week is

    41

    Let $A(5,4)$ and $B(5,-4)$ be two points.

    If $P$ is a point in the coordinate plane such that $\sqrt{A P B}=\frac{\pi}{4}$, then the point $P$ lies on the curve

    42

    When the axes are rotated through an angle $\theta$ about origin in anti-clockwise direction and then translated to the new origin $(2,-2)$, if the transformed equation the equation of $x^2+y^2=4$ is $X^2+Y^2+a X+b Y+c=0$ then $a+b+c=$

    43

    If the perpendicular distances from the points $(2,3)$, $(4, a)$ and $(\alpha, \beta)$ on to the line $3 x+4 y-3=0$ are equal and $4 \alpha-3 \beta+1=0$, then sum of all possible values of $a, \alpha$ and $\beta$ is

    44

    The equation of the base of an equilateral triangle is $x+y=2$ and its opposite vertex is $(2,1)$. If $m_1, m_2$ are the slopes of the other two sides and the length of its side is $a$, then $\left|m_1-m_2\right|+a \sqrt{2}=$

    45

    The triangle formed by the lines $2 x^2+x y-6 y^2=0$ and $x+y-1=0$ is

    46
    If $\left(\frac{2}{3}, 0\right)$ is the centroid of the triangle formed by the lines $4 x^2-y^2=0$ and $l x+m y+n=0$, then, $l+m+n=$
    47

    From a point $P(-4,0)$, two tangents are drawn to the circle $x^2+y^2-4 x-6 y-12=0$ touching the circle at $A$ and $B$. If the equation of the circle passing through $P, A$ and $B$ is $x^2+y^2+2 g x+2 f y+c=0$, then $(g, f)=$

    48

    If the equation of the polar of the point $(\alpha,-1)$ with respect to the circle $x^2+y^2-4 x-6 y-12=0$ is $y=\beta$, then $4(\alpha+\beta)=$

    49

    If $\theta$ is the angle between the tangents drawn from the point $(-1,-1)$ to the circle $x^2+y^2-4 x-6 y+c=0$ and $\cos \theta=-\frac{7}{25}$, then the radius of the circle is

    50

    If the power of the point $(1,6)$ with respect to the circle $x^2+y^2+4 x-6 y-a=0$ is -16 , then $a=$

    51

    The radius of the circle passing through the points of intersection of the circles $x^2+y^2+2 x+4 y+1=0$, $x^2+y^2-2 x-4 y-4=0$ and intersecting the circle $x^2+y^2=6$ orthogonally is

    52

    The lengths of the two focal chords of the parabola $y^2=16 x$ is 25 units each. If these two chords cut the parabola at $A, B, C$ and $D$, then the area (in sq. units) of the quadrilateral formed by $A, B, C$ and $D$ is

    53
    If the tangents drawn from a point $P$ to the ellipse $4 x^2+9 y^2-16 x+54 y+61=0$ are perpendicular, then the locus of $P$ is
    54

    $x+y+3=0,2 x-y+1=0$ are the equations of the asymptotes of a hyperbola.

    If $(1,-2)$ is a point on this hyperbola, then the equation of its conjugate hyperbola is

    55

    If $\theta$ is the acute angle between the tangents drawn from the point $(1,1)$ to the hyperbola $4 x^2-5 y^2-20=0$, then $\tan \theta=$

    56

    If $A(2,-1,1), B(2,5,1)$ and $C(0,-2,3)$ are the vertices of a triangle. If $D$ is the point of intersection of the side $B C$ and the internal angular bisector of angle $A$, then $A D=$

    57

    A line segment $P Q$ has the length 63 and direction ratios $(3,-2,6)$. If this line makes an obtuse angle with $X$-axis, then the components of the vector $\mathbf{P Q}$ are

    58

    A plane $\pi$ given by $a x+b y+11 z+d=0$ is perpendicular to the planes $2 x-3 y+z=4$, $3 x+y-z=5$ and the perpendicular distance from the origin to the plane $\pi$ is $\sqrt{6}$ units. If all the intercepts made by the plane $\pi$ on the coordinate axes are positive, then $d=$

    59
    The quadratic equation whose roots are $l=\lim\limits_{\theta \rightarrow 0}\left(\frac{3 \sin \theta-4 \sin ^3 \theta}{\theta}\right)$ and $m=\lim\limits_{\theta \rightarrow 0}\left(\frac{2 \tan \theta}{\theta\left(1-\tan ^2 \theta\right)}\right)$ is
    60

    $$ \mathop {\lim }\limits_{x \to \infty } \frac{3 x+4 \cos ^2 x}{\sqrt{x^2-5 \sin ^2 x}}= $$

    61

    If a function,

    $$ f(x)=\left\{\begin{array}{cc} \frac{\sqrt[3]{1+a x^2+b x^3}-\sqrt[3]{1-a x^2-b x^3}}{x^2}, & x<0 \\ 5, & x=0 \\ \frac{\tan 3 x-\sin 3 x}{b x^3}, & x>0 \end{array}\right. $$

    is continuous at $x=0$, then the geometric mean of $a$ and $b$ is

    62

    If $y=\log \left(\sec \left(\tan ^{-1} x\right)\right)(x>0)$, then $\frac{d y}{d x}$ at $x=1$ is

    63

    If $y=\sin ^{-1} \frac{\sqrt{1+\sin x}+\sqrt{1-\sin x}}{\sqrt{1+\sin x}-\sqrt{1-\sin x}}$ and $\frac{-3 \pi}{2}

    64

    If $x=\sqrt{2} e^t(\sin t-\cos t)$ and $y=\sqrt{2} e^t(\sin t+\cos t)$, then $\left(\frac{d^2 y}{d x^2}\right)_{t=\frac{\pi}{4}}=$

    65
    $P$ and $Q$ are the ends of a diameter of the circle $x^2+y^2=a^2\left(a>\frac{1}{\sqrt{2}}\right) . s$ and $t$ are the lengths of the perpendiculars drawn from $P$ and $Q$ onto the line $x+y=1$ respectively. When the product st is maximum, the greater value among $s, t$ is
    66
    Let $P(x)=x^4+a x^3+b x^2+c x+d$ be such that $x=0$ is the only real root of $P^1(x)=0$. If $P(-1)
    67

    If the volume of a sphere is increasing at the rate of 12 c.c. $/ \mathrm{sec}$, then the rate (in $\mathrm{sq} . \mathrm{cm} / \mathrm{sec}$ ) at which its surface area is increasing, when the diameter of the sphere is 12 cm is

    68

    If the lengths of the tangent, subtangent, normal and subnormal for the curve $y=x^2+x-1$ at the point $(1,1)$ are $a, b, c$ and $d$ respectively, then their increasing order is

    69

    $$ \int \frac{x+1}{x^3-1} d x= $$

    70

    $$ \int \frac{x^4-16 x^2+2 x+8}{x^3-4 x^2+2} d x= $$

    71

    $$ \int \frac{\sec ^2 x}{(\sec x+\tan x)^{\frac{5}{2}}} d x= $$

    72

    $$ \int \frac{1}{\cos x}\left[\frac{1}{\sin x}-\frac{1}{\sin x+3 \cos x}\right] d x= $$

    73

    $$ \int \cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right) d x= $$

    74

    $$ \int_0^x \frac{t^2}{\sqrt{a^2+t^2}} d t= $$

    75
    The area (in sq. units) of the region bounded by the lines $x=0, x=\frac{\pi}{2}$ and $f(x)=\sin x, g(x)=\cos x$ is
    76

    $$ \int_{\frac{5}{6}}^\pi \cos ^{-4} x d x= $$

    77

    $$ \int\limits_0^{\frac{3 \pi}{2}} \frac{\cos ^3 x}{\cos ^3 x+\sin ^3 x} d x= $$

    78

    The general solution of the differential equation $\sec (x-y+1) d y=d x$ is

    79
    The differential equation for which $y^2=4 a(x+a)$ ( $a$ is the parameter) is the general solution is
    80
    The general solution of the differential equation $\frac{d y}{d x}=\frac{2 x y-4 x+y-2}{2 x y+x-4 y-2}$ is

    Physics

    1

    Of the following, the pair of physical quantities not having the same dimensional formula is

    2

    If the distance travelled by a freely falling body in the last but one second of its motion is 5 m , then the last second is

    (Acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )

    3

    The angle of projection of a projectile whose path is shown in the given figure is

    AP EAPCET 2025 - 23rd May Morning Shift Physics - Motion in a Plane Question 5 English
    4

    If the equation of motion of a projectile is $y=A x-B x^2$, then the ratio of the maximum height reached and the range of the projectile is

    5

    A wire of length 2.5 m is fixed at one end and a box of mass 4 kg is tied at the other end. If the wire rotates in a horizontal circle about the fixed end with $\frac{2}{\pi}$ rotations per second, then the tension in the wire is

    6

    If the tension in the horizontal wire shown in the figure is 30 N , then the weight $W$ and tension in the wire $O A$ are respectively

    AP EAPCET 2025 - 23rd May Morning Shift Physics - Laws of Motion Question 3 English
    7

    A car of mass 2000 kg is accelerating from rest. If its engine is supplying constant power of 10 kW , then the velocity of the car at a time of 10 s is

    8

    A body of mass ' $M$ ' is moving with a uniform speed of ' $V^{\prime}$ on a frictionless horizontal surface under the influence of two forces $F_1$ and $F_2$ as shown in the figure. The net power of the system is

    AP EAPCET 2025 - 23rd May Morning Shift Physics - Work, Energy and Power Question 6 English
    9

    Radius of gyration of a thin uniform rod of length ' $L$ ' about an axis passing through its centre and perpendicular to its length is

    10

    A thin circular ring and a circular disc of equal mass are rolling without sliding. If their linear velocities are equal and the total kinetic energy of the disc is 6 J , then the total kinetic energy of the ring is

    11

    A body of mass 4 kg attached to a spring of force constant $64 \mathrm{Nm}^{-1}$ executes simple harmonic motion on a frictionless horizontal surface. The time period of oscillation is

    12

    A particle is executing simple harmonic motion with amplitude $A$. At a distance ' $x$ ' from the mean position, when the particle is moving towards extreme position it receives a blow in the direction of motion which instantaneously doubles its velocity. The new amplitude of the particle is

    (Frequency is constant during the motion)

    13

    A mass of $6 \times 10^{24} \mathrm{~kg}$ is to be compressed in the form of a solid sphere such that the escape velocity from its surface is $3 \times 10^4 \mathrm{~ms}^{-1}$. The radius of the sphere is

    (Universal gravitational constant $=6.66 \times 10^{-11} \mathrm{~N} \mathrm{~m}^2 \mathrm{~kg}^{-2}$ )

    14

    If the pressure on a body is increased from 200 kPa to 250 kPa , the volume of the body decreases by $0.25 \%$. The compressibility of the material of the body is (in $\mathrm{m}^2 \mathrm{~N}^{-1}$ )

    15
    A mercury drop of radius 1 cm is divided into $10^6$ droplets of equal size. If surface tension of mercury is $35 \times 10^{-3} \mathrm{Nm}^{-1}$, then the change in surface energy in the process is
    16
    Steam at $100^{\circ} \mathrm{C}$ is passed into 114 g of water at $30^o$ The mass of water present in the mixture when the temperature of the water becomes $70^{\circ} \mathrm{C}$ is (Latent heat of steam $=540 \mathrm{cal} \mathrm{g}^{-1}$, Specific heat capacity of water $=1 \mathrm{cal} \mathrm{g}^{-1}{ }^{\circ} \mathrm{C}^{-1}$ )
    17

    In a Carnot engine if the work done during isothermal expansion is $25 \%$ more than the work done during isothermal compression, then the efficiency of the engine is

    18

    The work done to increase the volume of 2 moles of an ideal gas from V to 2 V at a constant temperature $T$ is W . The work to be done to increase the volume of 2 moles of the same gas from 2 V to 4 V at the same constant temperature $T$ is

    19

    If the given graph shows the logarithmic values of pressure ( $p$ ) and volume ( $V$ ) of an ideal gas, then the ratio of the specific heat capacities of the gas is

    AP EAPCET 2025 - 23rd May Morning Shift Physics - Heat and Thermodynamics Question 11 English
    20

    The internal energy of one mole of a rigid diatomic gas at absolute temperature $T$ is

    21

    In a closed organ pipe, the number of nodes formed in fifth and ninth harmonics are respectively

    22

    A light ray falls on a rectangular glass slab as shown in the figure. If total internal reflection occurs at the vertical face of the slab at point $B$, the refractive index of glass is

    AP EAPCET 2025 - 23rd May Morning Shift Physics - Ray Optics Question 3 English
    23
    In Young's double slit experiment, the distance between the slits is 0.2 cm , the distance between the screen and the slits is 1 m . If the wavelength of light used in the experiment is $5000 \mathop {\rm{A}}\limits^{\rm{o}}$, then the distance between two consecutive dark fringes on the screen is
    24
    A particle of mass 0.2 g and charge 2 C is released from rest in a uniform electric field of $20 \mathrm{NC}^{-1}$. The kinetic energy of the particle after moving a distance of 20 cm is
    25

    If 27 indentical charged conducting spheres each of capacitance $10 \mu \mathrm{~F}$ combine to form a big sphere, then the capacitance of the big sphere is

    26

    The capacitance of a spherical capacitor is 100 pF . If the spacing between the two spheres is 1 cm , then the radius of the inner sphere of the capacitor is

    27

    A wire of resistance ' $R$ ' is bent in the form of a circular loop. Two points on the circle seperated by a quarter circumference are connected to a battery of emf ' $E$ ' and negligible internal resistance. The heat generated in the wire per second is

    28

    When a wire is connected in the left gap of a metre bridge, the balancing point is at 40 cm from the left end of the bridge wire. If the wire in the left gap is stretched so that its length is doubled and again connected in the same gap, then the balancing point from the left end of the bridge wire is

    29

    If a charged particle enters a uniform magnetic field normally with certain velocity, then the time period of revolution of the particle

    30

    A long straight wire of circular cross-section of radius ' $a$ ' is carrying a steady current. The current is distributed uniformly across the cross-section of the wire. The ratio of the magnetic fields at points $0.5 a$ and $1.5 a$ from the centre of the wire is

    31
    Materials suitable for permanent magnets should have
    32

    If a wheel with 24 metallic spokes each 40 cm long is rotated with a speed of $180 \mathrm{rev} / \mathrm{min}$ in a plane normal to the horizontal component of Earth's magnetic field, the emf induced between the axle and the rim of the wheel is $E$. If the number of spokes is made 12 and the wheel is rotated with a speed of $90 \mathrm{rev} / \mathrm{min}$ in the same field, the induced emf is

    33

    If a resistor of resistance $4 \Omega$, a capacitor of capacitive reactance $6 \Omega$ and an inductor of inductive reactance $9 \Omega$ are connected in series with an AC source, then the impedance of the circuit is

    34

    The ratio of the magnitudes of the electric field and $10^8$ times the magnetic field of a plane electromagnetic wave is

    35
    If a proton and an alpha particle are accelerated through the same potential difference, then the ratio of their de-Broglie wavelengths is
    36

    Of the following, Bohr's atomic model is applicable to

    37

    The ratio of the orders of the spacings of nuclear energy levels and atomic energy levels is

    38

    The voltage gain and the current amplification factor of a transistor in common emitter configuration are 300 and 60 respectively. If the collector resistance is $5 \mathrm{k} \Omega$, then the base resistance is

    39

    The logic gate equivalent to the circuit shown in the figure is

    AP EAPCET 2025 - 23rd May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 7 English
    40
    If the maximum and minimum amplitudes of a modulated wave are 25 V and 5 V respectively, then the modulation index is