Other Physics · JEE Main previous year questions

2025 15 questions

1. Q422025 · 4 Apr 2025 · Shift 2

   There are ' $n$ ' number of identical electric bulbs, each is designed to draw a power $p$ independently from the mains supply. They are now joined in series across the mains supply. The total power drawn by the combination is :

   1. A.$np$
   2. B.$p$
   3. C.$\frac{p}{n^2}$
   4. D.$\frac{p}{n}$
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   Answer: D

2. Q322025 · 3 Apr 2025 · Shift 1

   Consider a completely full cylindrical water tank of height $1.6\mathrm{m}$ and of cross-sectional area $0.5{\mathrm{m}}^2$. It has a small hole in its side at a height $90\mathrm{cm}$ from the bottom. Assume, the cross-sectional area of the hole to be negligibly small as compared to that of the water tank. If a load $50\mathrm{kg}$ is applied at the top surface of the water in the tank then the velocity of the water coming out at the instant when the hole is opened is: $(g=10m/{\mathrm{s}}^2)$

   1. A.$2m/s$
   2. B.$5m/s$
   3. C.$3m/s$
   4. D.$4m/s$
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   Answer: D

3. Q362025 · 3 Apr 2025 · Shift 1
   
   1. A.$2.5m/{\mathrm{s}}^2$
   2. B.$3.5m/{\mathrm{s}}^2$
   3. C.$0.25m/{\mathrm{s}}^2$
   4. D.$0.35m/{\mathrm{s}}^2$
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   Answer: B

4. Q402025 · 3 Apr 2025 · Shift 2

   Pressure of an ideal gas, contained in a closed vessel, is increased by $0.4\%$ when heated by $1^{\circ }\mathrm{C}$. Its initial temperature must be:

   1. A.$2500\mathrm{K}$
   2. B.$25^{\circ }\mathrm{C}$
   3. C.$250^{\circ }\mathrm{C}$
   4. D.$250\mathrm{K}$
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   Answer: D

5. Q352025 · 2 Apr 2025 · Shift 1
   
   1. A.10 N
   2. B.0 (zero)
   3. C.$10\sqrt{2}\text{ N}$
   4. D.20 N
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   Answer: A

6. Q372025 · 2 Apr 2025 · Shift 2
   
   1. A.$1\mathrm{V}$
   2. B.$\frac{1}{4}\mathrm{V}$
   3. C.$\frac{3}{4}\mathrm{V}$
   4. D.$\frac{2}{5}\mathrm{V}$
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   Answer: D

7. Q292025 · 29 Jan 2025 · Shift 2

   The difference of temperature in a material can convert heat energy into electrical energy. To harvest the heat energy, the material should have

   1. A.low thermal conductivity and high electrical conductivity
   2. B.low thermal conductivity and low electrical conductivity
   3. C.high thermal conductivity and high electrical conductivity
   4. D.high thermal conductivity and low electrical conductivity
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   Answer: A

8. Q332025 · 29 Jan 2025 · Shift 2

   A cup of coffee cools from $90^{\circ }\mathrm{C}$ to $80^{\circ }\mathrm{C}$ in $t$ minutes when the room temperature is $20^{\circ }\mathrm{C}$. The time taken by the similar cup of coffee to cool from $80^{\circ }\mathrm{C}$ to $60^{\circ }\mathrm{C}$ at the same room temperature is:

   1. A.$\frac{13}{5}t$
   2. B.$\frac{10}{13}t$
   3. C.$\frac{5}{13}t$
   4. D.$\frac{13}{10}t$
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   Answer: A

9. Q472025 · 29 Jan 2025 · Shift 2· Numerical answer

   Two cars P and Q are moving on a road in the same direction. Acceleration of car P increases linearly with time whereas car Q moves with a constant acceleration. Both cars cross each other at time t = 0, for the first time. The maximum possible number of crossing(s) (including the crossing at t = 0) is ________.

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   Answer: 3

10. Q292025 · 24 Jan 2025 · Shift 2

    The temperature of a body in air falls from $40^{\circ }\mathrm{C}$ to $24^{\circ }\mathrm{C}$ in 4 minutes. The temperature of the air is $16^{\circ }\mathrm{C}$. The temperature of the body in the next 4 minutes will be :

    1. A.${\frac{28}{3}}^{\circ }\mathrm{C}$
    2. B.${\frac{56}{3}}^{\circ }\mathrm{C}$
    3. C.${\frac{42}{3}}^{\circ }\mathrm{C}$
    4. D.${\frac{14}{3}}^{\circ }\mathrm{C}$
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    Answer: B

11. Q312025 · 24 Jan 2025 · Shift 2
    
    1. A.zero
    2. B.$40\pi$
    3. C.$5\pi$
    4. D.$10\pi$
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    Answer: C

12. Q382025 · 24 Jan 2025 · Shift 2
    
    1. A.
    2. B.
    3. C.
    4. D.
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    Answer: D

13. Q422025 · 24 Jan 2025 · Shift 2

    The position vector of a moving body at any instant of time is given as $\vec{r}=\left(5t^2\hat{i}-5t\hat{j}\right)\text{m}$. The magnitude and direction of velocity at $t=2s$ is,

    1. A.$5\sqrt{17}\text{ m/s}$, making an angle of ${\tan }^{-1}4$ with - ve Y axis
    2. B.$5\sqrt{15}\text{ m/s}$, making an angle of ${\tan }^{-1}4$ with + ve X axis
    3. C.$5\sqrt{17}\text{ m/s}$, making an angle of ${\tan }^{-1}4$ with + ve X axis
    4. D.$5\sqrt{15}\text{ m/s}$, making an angle of ${\tan }^{-1}4$ with $-\text{ve }Y$ axis
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    Answer: A

14. Q492025 · 24 Jan 2025 · Shift 2· Numerical answer

    Acceleration due to gravity on the surface of earth is ' $g$ '. If the diameter of earth is reduced to one third of its original value and mass remains unchanged, then the acceleration due to gravity on the surface of the earth is ________ g.

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    Answer: 9

15. Q292025 · 22 Jan 2025 · Shift 1

    Two spherical bodies of same materials having radii 0.2 m and 0.8 m are placed in same atmosphere. The temperature of the smaller body is 800 K and temperature of the bigger body is 400 K . If the energy radiated from the smaller body is E, the energy radiated from the bigger body is (assume, effect of the surrounding temperature to be negligible),

    1. A.64 E
    2. B.16 E
    3. C.E
    4. D.256 E
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    Answer: C