Biology
1. Which of the following root modifications is observed in maize? 2. Which of the following chemical intermediates are products of light in photosynthesis?
3. Which of the following organisms produce Cry proteins?
4. A hypothetical plant species shows two flower colour phenotypes- red and white. Red is dominant over white. In a populat 5. Troponin controls binding of actin to myosin motor, thereby regulating muscle contraction. Binding of which metal ions t 6. The following word diagram depicts a food chain in a forest.
$$ \text { Trees (Aspen, willow) } \rightarrow \text { Herb 7. Which of the following is the correct description of interferon?
8. Which of the following products are expected when lipase acts on diglycerides?
9. Radial symmetry is NOT found in which of the following taxa?
10. Reabsorption of which of these molecules in kidney occurs via passive transport?
11. $$ \text { Match the human cell types or (column I) to the number of chromatids (column II) } $$
.tg {border-collaps 12. Which of the following processes is NOT involved in functionalisation of mRNA (from hnRNA) in eukaryotes?
13. Which of the following processes increases the uptake of water and minerals by roots in legumes?
14. Which of the following graphs correctly represents the relationship between population growth rate $(\mathrm{dN} / \math 15. Which of the following processes gives rise to new organisms from unfertilized ova in some species of plants and animal
Chemistry
1. $$ \text { How many atoms are present in a hexagonal close-packed unit cell? } $$ 2. The molar conductivity of 0.00241 M acetic acid is $32.87 \mathrm{Scm}^2 \mathrm{~mol}^{-1}$. If the limiting molar cond 3. $$ \text { What is the most appropriate Lewis structure of } \mathrm{NO}_2 \mathrm{~F} \text { ? } $$ 4. Common disaccharide sucrose is held together by a glycosidic linkage between
5. Select the correct option based on the increasing order of boiling point of the molecules given below.
6. Identify the major product that forms easily and faster in the following reaction. (Tetrahydrofuran= solvent)
7. A first-order reaction is found to have a half-life of one second (sec). What will be the time required for $99.9 \%$ co 8. The total number of nodes for a given principal quantum number $n$, and azimuthal quantum number $\ell$, are
9. Which among the following is NOT correct?
10. Which among the following is NOT correct regarding the first ionization potential $\left(\mathrm{IP}_1\right)$ of period 11. Which one of the following aqueous solutions gives the most intense colour?
12. What is the correct relation between the heat capacity at constant volume $\left(C_v\right)$ and heat capacity at consta 13. $$ \text { The number of unpaired electron(s) in the square planar complex }[\text{Ni}(\text{CN})_4]^{2-} \text { is/ar 14. $$ \text { Select the most appropriate compound I and the reagents for the synthesis of compound II } $$
15. $$ \text { Identify the final major product III in the following reaction sequence: } $$
Mathematics
1. If S is the set of all points $(x, y)$ satisfying the equation $\sin x=\cos y$, then which of the following statements i 2. If $A=\left[\begin{array}{lll}1 & a & 0 \\ 0 & 1 & b \\ 0 & 0 & 1\end{array}\right]$, then the determinant of $I-A+A^2-A 3. Let $S=\{(a, b): a, b \in Q\}$ and $\ell$ be the line $y=m x+c$. Which of the following statements is not correct?
4. If $p(t)=\frac{t(t-1) \cdots(t-2019)}{2019!}$, then the value of
$$ \int_0^1\left(\frac{1}{t+1}+\frac{1}{t+2}+\cdots+\fr 5. Let $a, b$ be nonzero real numbers. If $p(x)=x^n+c_{n-1} x^{n-1}+\cdots+c_0$, where $c_{n-1}, \ldots, c_0$ are integers 6. The number of skew-symmetric matrices $A=\left[a_i j\right]_{3 \times 3}$, where $a_i j \in\{-3,-2,-1,0,1,2,3\}$ is:
7. $$ \text { Define binary operation * on } Q \text { by } a * b=a+b-3 \text {. The inverse of } 2 \text { with respect t 8.
Let $[x]$ denote the greatest integer less than or equal to $x$. The number of positive integer solutions of the equati 9. Let $f: \mathbb{R} \rightarrow \mathbb{R}$ and $g: \mathbb{R} \rightarrow \mathbb{R}$ be two functions such that
$$ g \c 10. $F(x)=\int_0^{e^x}\left(t^3+2 t^2-t-2\right) d t$, then for how many real numbers $x$ does $F^{\prime}(x)=0$ ? 11. Let $C$ be a circle which passes through $(-2,1)$ and $(0,3)$ and whose centre lies on the line $y-x=1$. Then which of t 12. For what value of $t$ does $f(x)=x^3+t x^2+(2-t) x-3$ have only real roots?
13. If $f(x)=a x^2+b x+c$ and $f\left(\frac{1}{n}\right)=\frac{n+1}{n^2}$ for all $n \in N$, then what is the value of $\lim 14. A bag contains 8 balls, of which 5 are green and 3 are red. The probability that two balls chosen at random are of the s 15. Consider the differential equation $f^{\prime \prime}+p f^{\prime}+q f=0$ where $p$ and $q$ are constants, $p^2=4 q$ and
Physics
1. The potential energy of a point particle of mass $m$ undergoing rectilinear motion along the $x$-axis is given by
$$ V(x 2. Two identical containers kept at the same temperature carry the same gas with different molecular mean free paths $l_1$ 3. Consider the circuit with a Zener diode whose breakdown voltage $V_z=4 \mathrm{~V}$. What is the voltage $V_0$ if $V_i=2 4. Consider a mass-pulley system as shown in the figure. There is a wedge of mass $M$ and equal wedge angles $\theta$ lying 5. What is the maximum angle of incidence $\theta_i$ in the figure for which the ray would satisfy the condition for total 6. $$ \text { What is the equivalent resistance between the points } A \text { and } B \text { in the figure? } $$
7. Consider a solid rod of mass $m$ and uniform density resting against a vertical wall and horizontal floor as shown in th 8. The charge distribution inside a sphere of radius $R=2 a / b$ is given by the volume charge density $\rho=a r^2-b r^3$, 9. The acceleration due to earth's gravity on a point particle at a height $h$ above the surface of the earth is denoted by 10. Consider an infinite one-dimensional wire carrying a uniform current $I$ as shown in the figure. A square loop of side $ 11. The electric field of an electromagnetic wave is given by $\vec{E}(x, t)=E_0 \hat{z} \cos (a x+b t)$
If $c$ is the speed 12. An electron of mass $m_e$ has a speed $u_n$ in the $n^{\text {th }}$ Bohr orbit of a hydrogen atom. The normalized speed 13. In the photoelectric effect experiment, the frequency of the incident light is changed from red to blue while keeping t 14. An ideal rigid diatomic gas undergoes expansion at constant pressure when $\Delta Q$ heat is added to it. What is the r 15. The fundamental constants are given to be permittivity constant $\left(\epsilon_0\right)$, Planck's constant $(h)$, velo
1
IAT (IISER) 2020
MCQ (Single Correct Answer)
+4
-1
Troponin controls binding of actin to myosin motor, thereby regulating muscle contraction. Binding of which metal ions to troponin is crucial for this purpose?
A
$N a$
B
$K$
C
$M g$
D
Ca
2
IAT (IISER) 2020
MCQ (Single Correct Answer)
+4
-1
The following word diagram depicts a food chain in a forest.
$$ \text { Trees (Aspen, willow) } \rightarrow \text { Herbivore (Elk) } \rightarrow \text { Predator (Wolf) } $$
Which is the most likely outcome of depletion in predator population?
A
Increased browsing by the herbivores stimulates the plant growth leading to increased primary productivity
B
Overgrowth of herbivore population causing reduction in tree populations and therefore, if the process continues the entire ecosystem will breakdown
C
No change in the ecosystem as the herbivore and the tree populations will continue to maintain equilibrium
D
Overgrowth of herbivore population without any change in the remaining part of the ecosystem
3
IAT (IISER) 2020
MCQ (Single Correct Answer)
+4
-1
Which of the following is the correct description of interferon?
A
A synthetic neurotransmitter used to treat neuronal diseases
B
A class of proteins secreted by B-lymphocytes that categorically attack and destroy virusinfected cells
C
Signalling molecules that interfere with its own synthesis inside a secretory cell
D
A class of proteins secreted by virus infected cells and are involved in protecting uninfected cells
4
IAT (IISER) 2020
MCQ (Single Correct Answer)
+4
-1
Which of the following products are expected when lipase acts on diglycerides?
A
Fatty acids and glucose
B
Glucose and galactose
C
Fatty acids and glycerol
D
Monoglycerides and glycerol
Paper analysis
Total Questions
Biology
15
Chemistry
15
Mathematics
15
Physics
15
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IAT (IISER)
Papers
2020