Other Physics · JEE Main previous year questions

2024 52 questions

1. Q402024 · 9 Apr 2024 · Shift 2
   
   1. A.a solar cell
   2. B.a transistor which can be used as an amplifier
   3. C.a diode which can be used as a rectifier
   4. D.a zener diode which can be used as a voltage regulator
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   Answer: D

2. Q512024 · 9 Apr 2024 · Shift 2· Numerical answer

   The resultant of two vectors $\vec{A}$ and $\vec{B}$ is perpendicular to $\vec{A}$ and its magnitude is half that of $\vec{B}$. The angle between vectors $\vec{A}$ and $\vec{B}$ is ____${}^{\circ }$.

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   Answer: 150

3. Q312024 · 8 Apr 2024 · Shift 1

   A stationary particle breaks into two parts of masses $m_A$ and $m_B$ which move with velocities $v_A$ and $v_B$ respectively. The ratio of their kinetic energies $(K_B:K_A)$ is :

   1. A.$v_B:v_A$
   2. B.$1:1$
   3. C.$m_B{v}_B:m_A{v}_A$
   4. D.$m_B:m_A$
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   Answer: A

4. Q352024 · 8 Apr 2024 · Shift 1

   In an expression $a\times 10^b$ :

   1. A.$a$ is order of magnitude for $b\le 5$
   2. B.$b$ is order of magnitude for $a\le 5$
   3. C.$b$ is order of magnitude for $a\ge 5$
   4. D.$b$ is order of magnitude for $5<a\le 10$
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   Answer: B

5. Q362024 · 8 Apr 2024 · Shift 1

   A clock has $75\text{ cm},60\text{ cm}$ long second hand and minute hand respectively. In 30 minutes duration the tip of second hand will travel $x$ distance more than the tip of minute hand. The value of $x$ in meter is nearly (Take $\pi =3.14$) :

   1. A.$118.9$
   2. B.$140.5$
   3. C.$139.4$
   4. D.$220.0$
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   Answer: C

6. Q382024 · 8 Apr 2024 · Shift 1

   A player caught a cricket ball of mass $150\text{ g}$ moving at a speed of $20\text{ m/s}$. If the catching process is completed in $0.1\text{ s}$, the magnitude of force exerted by the ball on the hand of the player is:

   1. A.$150\text{ N}$
   2. B.$3\text{ N}$
   3. C.$30\text{ N}$
   4. D.$300\text{ N}$
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   Answer: C

7. Q392024 · 8 Apr 2024 · Shift 1

   Three bodies A, B and C have equal kinetic energies and their masses are $400\text{ g},1.2\text{ kg}$ and $1.6\text{ kg}$ respectively. The ratio of their linear momenta is :

   1. A.$1:\sqrt{3}:2$
   2. B.$\sqrt{3}:\sqrt{2}:1$
   3. C.$1:\sqrt{3}:\sqrt{2}$
   4. D.$\sqrt{2}:\sqrt{3}:1$
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   Answer: A

8. Q532024 · 8 Apr 2024 · Shift 1· Numerical answer
   
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   Answer: 3

9. Q322024 · 6 Apr 2024 · Shift 2

   A body projected vertically upwards with a certain speed from the top of a tower reaches the ground in $t_1$. If it is projected vertically downwards from the same point with the same speed, it reaches the ground in $t_2$. Time required to reach the ground, if it is dropped from the top of the tower, is :

   1. A.$\sqrt{t_1+t_2}$
   2. B.$\sqrt{t_1{t}_2}$
   3. C.$\sqrt{\frac{t_1}{t_2}}$
   4. D.$\sqrt{t_1-t_2}$
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   Answer: B

10. Q342024 · 6 Apr 2024 · Shift 2

    A body of weight $200\mathrm{N}$ is suspended from a tree branch through a chain of mass $10\mathrm{kg}$. The branch pulls the chain by a force equal to (if $g=10m/{\mathrm{s}}^2$) :

    1. A.$300\mathrm{N}$
    2. B.$100\mathrm{N}$
    3. C.$150\mathrm{N}$
    4. D.$200\mathrm{N}$
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    Answer: A

11. Q352024 · 6 Apr 2024 · Shift 2

    The number of electrons flowing per second in the filament of a $110\mathrm{W}$ bulb operating at $220\mathrm{V}$ is : (Given $\mathrm{e}=1.6\times 10^{-19}\mathrm{C}$)

    1. A.$1.25\times 10^{19}$
    2. B.$31.25\times 10^{17}$
    3. C.$6.25\times 10^{18}$
    4. D.$6.25\times 10^{17}$
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    Answer: B

12. Q442024 · 6 Apr 2024 · Shift 2

    The longest wavelength associated with Paschen series is : (Given ${\mathrm{R}}_{\mathrm{H}}=1.097\times 10^7\mathrm{SI}\mathrm{unit}$)

    1. A.$2.973\times 10^{-6}\mathrm{m}$
    2. B.$1.876\times 10^{-6}\mathrm{m}$
    3. C.$1.094\times 10^{-6}\mathrm{m}$
    4. D.$3.646\times 10^{-6}\mathrm{m}$
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    Answer: B

13. Q482024 · 6 Apr 2024 · Shift 2

    Assuming the earth to be a sphere of uniform mass density, a body weighed $300\mathrm{N}$ on the surface of earth. How much it would weigh at $\mathrm{R}/4$ depth under surface of earth ?

    1. A.$75\mathrm{N}$
    2. B.$375\mathrm{N}$
    3. C.$300\mathrm{N}$
    4. D.$225\mathrm{N}$
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    Answer: D

14. Q372024 · 5 Apr 2024 · Shift 2

    A man carrying a monkey on his shoulder does cycling smoothly on a circular track of radius $9\mathrm{m}$ and completes 120 revolutions in 3 minutes. The magnitude of centripetal acceleration of monkey is (in $m/{\mathrm{s}}^2$) :

    1. A.$4{\pi }^2{\mathrm{ms}}^{-2}$
    2. B.$16{\pi }^2{\mathrm{ms}}^{-2}$
    3. C.$57600{\pi }^2{\mathrm{ms}}^{-2}$
    4. D.Zero
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    Answer: B

15. Q362024 · 4 Apr 2024 · Shift 1

    If a rubber ball falls from a height $h$ and rebounds upto the height of $h/2$. The percentage loss of total energy of the initial system as well as velocity of ball before it strikes the ground, respectively, are :

    1. A.$50\%,\sqrt{2\mathrm{gh}}$
    2. B.$50\%,\sqrt{\mathrm{gh}}$
    3. C.$50\%,\sqrt{\frac{\mathrm{gh}}{2}}$
    4. D.$40\%,\sqrt{2\mathrm{gh}}$
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    Answer: A

16. Q392024 · 4 Apr 2024 · Shift 1

    A body travels $102.5\mathrm{m}$ in ${\mathrm{n}}^{\mathrm{th}}$ second and $115.0\mathrm{m}$ in $(\mathrm{n}+2{)}^{\mathrm{th}}$ second. The acceleration is :

    1. A.$6.25m/{\mathrm{s}}^2$
    2. B.$5m/{\mathrm{s}}^2$
    3. C.$12.5m/{\mathrm{s}}^2$
    4. D.$9m/{\mathrm{s}}^2$
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    Answer: A

17. Q412024 · 4 Apr 2024 · Shift 1

    The co-ordinates of a particle moving in $x$-$y$ plane are given by : $x=2+4t$, $y=3t+8t^2$. The motion of the particle is :

    1. A.uniform motion along a straight line.
    2. B.non-uniformly accelerated.
    3. C.uniformly accelerated having motion along a straight line.
    4. D.uniformly accelerated having motion along a parabolic path.
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    Answer: D

18. Q482024 · 4 Apr 2024 · Shift 1
    
    1. A.
    2. B.
    3. C.
    4. D.
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    Answer: D

19. Q502024 · 4 Apr 2024 · Shift 1

    On Celsius scale the temperature of body increases by $40^{\circ }\mathrm{C}$. The increase in temperature on Fahrenheit scale is :

    1. A.$75^{\circ }\mathrm{F}$
    2. B.$70^{\circ }\mathrm{F}$
    3. C.$72^{\circ }\mathrm{F}$
    4. D.$68^{\circ }\mathrm{F}$
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    Answer: C

20. Q572024 · 4 Apr 2024 · Shift 1· Numerical answer

    Two forces ${\overline{\mathrm{F}}}_1$ and ${\overline{\mathrm{F}}}_2$ are acting on a body. One force has magnitude thrice that of the other force and the resultant of the two forces is equal to the force of larger magnitude. The angle between ${\vec{F}}_1$ and ${\vec{F}}_2$ is ${\cos }^{-1}\left(\frac{1}{n}\right)$. The value of $|n|$ is ____.

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    Answer: 6

21. Q482024 · 4 Apr 2024 · Shift 2

    An electric bulb rated $50\text{ W}-200\text{ V}$ is connected across a $100\text{ V}$ supply. The power dissipation of the bulb is:

    1. A.$100\text{ W}$
    2. B.$50\text{ W}$
    3. C.$12.5\text{ W}$
    4. D.$25\text{ W}$
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    Answer: C

22. Q522024 · 1 Feb 2024 · Shift 1· Numerical answer

    A plane is in level flight at constant speed and each of its two wings has an area of $40{\mathrm{m}}^2$. If the speed of the air is $180km/h$ over the lower wing surface and $252km/h$ over the upper wing surface, the mass of the plane is ____ kg. (Take air density to be $1\mathrm{kg}{\mathrm{m}}^{-3}$ and $\mathrm{g}=10\mathrm{m}{\mathrm{s}}^{-2}$ )

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    Answer: 9600

23. Q322024 · 1 Feb 2024 · Shift 2

    A body of mass $4\text{ kg}$ experiences two forces ${\vec{F}}_1=5\hat{i}+8\hat{j}+7\hat{k}$ and ${\vec{F}}_2=3\hat{i}-4\hat{j}-3\hat{k}$. The acceleration acting on the body is :

    1. A.$2\hat{i}+\hat{j}+\hat{k}$
    2. B.$4\hat{i}+2\hat{j}+2\hat{k}$
    3. C.$-2\hat{i}-\hat{j}-\hat{k}$
    4. D.$2\hat{i}+3\hat{j}+3\hat{k}$
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    Answer: A

24. Q372024 · 1 Feb 2024 · Shift 2

    A big drop is formed by coalescing 1000 small droplets of water. The surface energy will become :

    1. A.$\frac{1}{100}\text{ th}$
    2. B.$\frac{1}{10}\text{ th}$
    3. C.$100\text{ times}$
    4. D.$10\text{ times}$
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    Answer: B

25. Q382024 · 1 Feb 2024 · Shift 2

    A cricket player catches a ball of mass $120\text{ g}$ moving with $25\text{ m/s}$ speed. If the catching process is completed in $0.1\text{ s}$ then the magnitude of force exerted by the ball on the hand of player will be (in SI unit) :

    1. A.30
    2. B.24
    3. C.12
    4. D.25
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    Answer: A