1
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

A flask contains argon and chlorine in the ratio of $2: 1$ by mass. The temperature of the mixture is $27^{\circ} \mathrm{C}$. The ratio of root mean square speed of the molecules of the two gases $\left(\frac{V_{\mathrm{rms}}^{\mathrm{Ar}}}{V_{\mathrm{rms}}^{\mathrm{Cl}}}\right)$ is:

(Atomic mass of argon $=40.0 \mathrm{u}$ and molecular mass of chlorine $=70.0 \mathrm{u}$ )

A

$\frac{\sqrt{7}}{2}$

B

$\frac{7}{4}$

C

$\frac{7}{2}$

D

$\frac{2}{\sqrt{7}}$

2
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

A ray of monochromatic light is passing through an equilateral prism $(A B C)$ as shown in the figure. The refracted ray $(Q R)$ is parallel to its base $(B C)$ and the angle of incidence $(i)$ is $50^{\circ}$. Then the angle of deviation $(\delta)$ is:

NEET 2026 Physics - Geometrical Optics Question 1 English

A

$45^{\circ}$

B

$35^{\circ}$

C

$40^{\circ}$

D

$55^{\circ}$

3
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

$$ \text { Match List I with List II. } $$

$$
\text { List-I }
$$
$$
\text { List-II }
$$
A. $E=h v$ I. de Broglie wavelength
B. Diffraction and Interference II. Particle nature of light
C. $\lambda=h / p$ III. Wave nature of light
D. Compton effect IV. Energy of photon
A

A-IV, B-I, C-II, D-III

B

A-IV, B-III, C-II, D-I

C

A-I, B-IV, C-III, D-II

D

A-IV, B-III, C-I, D-II

4
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

In the first excited state of hydrogen atom, the energy of its electron is -3.4 eV . The radial distance of the electron from the hydrogen nucleus in this case is approximately:

(Take $1 \mathrm{eV}=1.6 \times 10^{-19} \mathrm{~J}, \mathrm{e}=1.6 \times 10^{-19} \mathrm{C}$ and $\frac{1}{4 \pi \varepsilon_0}=9 \times 10^9 \mathrm{~N} \mathrm{~m}^2 / \mathrm{C}^2$ )

A

$2.1 \times 10^{-9} \mathrm{~m}$

B

$2.1 \times 10^{-8} \mathrm{~m}$

C

$2.1 \times 10^{-10} \mathrm{~m}$

D

$2.1 \times 10^{-11} \mathrm{~m}$