Physics Question and Answers

1. A mortar fires a bomb of mass $M$ at an angle $q$ with initial speed $v _0$. The bomb explodes at the top of trajectory and breaks into two equal bombs A and B. Bomb A lands close to the mortar. In the same time bomb B lands away from the mortar. The ratio of speed of bomb A to that of bomb B just after the explosion at the top is

System of Particles and Rotational Motion

2. A pendulum is suspended from the ceiling of the cart as shown in the figure. Find the horizontal acceleration of the cart for which pendulum will become equally inclined from the horizontal and vertical :-

Laws of Motion

3. If a school bus, on it's way to school, covers half the distance with velocity $v_1$ and other half with velocity $v_2$. The average velocity of the school bus would be:

Kinematics

4. Two charged sphere A and B, shown below are isolated conductors, A having +Q charge and $B$ having $+4 Q$ charge and radius $r_A=1 / 2 r_B$. OX, is a straight line passing through their centres.

The potential ‘$V$’ at any point on $OX$, plotted against the distance ‘$x$’ of the point from $O$, will be nearly

Electrostatic Potential and Capacitance

5. Half-life of radioactive substance is $3.20 \,h$. What is the time taken for a $75\%$ of substance to be used ?

Bihar CECE 2001 Nuclei

6. A monatomic ideal gas, initially at temperature $T_1$, is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature $T_2$ by releasing the piston suddenly. If $L_1$ and $L_2$ are the length of the gas column before and after expansion respectively, then $\frac{T_1}{T_2}$ is given by

Thermodynamics

7. If the tension and diameter of a sonometer wire of fundamental frequency $n$ is doubled and density is halved then its fundamental frequency will become

Waves

8. Two coherent point sources $S_1$ and $S_2$ are separated by a small distance ' $d$ ' as shown in figure. The fringes obtained on the screen will be

Wave Optics

9. A bar magnet has coercivity of $4 \times 10^3 A m ^{-1}$. It is desired to demagnetise it by inserting it inside a solenoid $12\, cm$ long and having $60$ turns. The current that should be sent through the solenoid is

Magnetism and Matter

10. The electric field in a certain region is acting radially outward and is given by $E=$ Ar. The charge contained in a sphere of radius '$a$' centred at the origin of the field, will be given by :

Electric Charges and Fields

11. A plane is flying horizontally at $98m/s$ and releases an object which reaches the ground in $10$ sec. The angle made by object while
hitting the ground is :

NTA Abhyas 2020

12. A copper wire and a steel wire of the same diameter and length are joined end to end and a force is applied which stretches their combined length by $1 \,cm$. Then the two wires will have

Manipal 2008 Mechanical Properties of Solids

13. Monochromatic light of wavelength $3000 $ is incident on a surface area $4\, cm^ 2$. If intensity of light is $150 \, m\,W/m^2$, then rate at which photons strike the target is

BITSAT 2007

14. If $\vec{A}=\hat{i}+2 \hat{j}-\hat{k}, \vec{B}=-\hat{i}+\hat{j}-2 \hat{k}$, then angle between $\vec{A}$ and $\vec{B}$ is

Motion in a Plane

15. An ideal gas is taken through the cycle $ A\to B\to C\to A, $ as shown in figure. If the net heat supplied to the gas in the cycle is $5 \,J$, the work done by the gas in the process. $ C\to A $ is

Rajasthan PMT 2007 Thermodynamics

16. An ammeter reads up to $1$ ampere. Its internal resistance is $0.81\, ohm$. To increase the range to $10\, A$ the value of the required shunt ( in ohm) is

KCET 2022

17. A potentiometer has a uniform wire of length $5\,m$. A battery of emf $10\,V$ and negligible internal resistance is connected between its ends. A secondary cell connected to the circuit gives balancing length at $200 \,cm$. The emf of the secondary cell is

KCET 2020 Current Electricity

18. An electric potential difference will be induced between ends of the conductor as shown in the diagram, when the conductor moves in the direction

Electromagnetic Induction

19. The relative permeability is represented by $\mu_r$ and the susceptibility is denoted by $\chi$ for a magnetic substance. Then for a paramagnetic substance

Magnetism and Matter

20. What does the term 'relaxation time' refer to in the context of electron motion?

Current Electricity

21. A rotating wheel changes angular speed from $1800 \, rpm$ to $3000 \, rpm$ in $20 \, s$ . What is the angular acceleration assuming it to be uniform?

NTA Abhyas 2020 Laws of Motion

22. A plano convex lens of $\left(\right.f=20 \, cm\left.\right)$ is silvered at plane surface. New $f$ will be

NTA Abhyas 2020 Ray Optics and Optical Instruments

23. Statement I: The speed of sound in solids is maximum though their density is larger than liquid.
Statement II: The coefficient of elasticity of solid is large.

Waves

24. Centre of mass of three particles of masses $1\, kg, 2\, kg$ and $3\, kg$ lies at the point $(1,2,3)$ and centre of mass of another system of particles $3\, kg$ and $2\, kg$ lies at the point $(-1,3,-2)$. Where should we put a particle of mass $5\, kg$ so that the centre of mass of entire system lies at the centre of mass of first system?

System of Particles and Rotational Motion

25. A street car moves rectilinearly from station $A$ (here car stops) to the next station $B$ (here also car stops) with an acceleration varying according to the law $f=a-b x$, where $a$ and $b$ are positive constants and $x$ is the distance from station A. The distance between the two stations & the maximum velocity are:

Oscillations

26. A permanent magnet attracts

AIIMS 1996 Magnetism and Matter

27. Statement I : For the planets orbiting around the sun, angular speed, linear speed, K.E. changes with time, but angular momentum remains constant.
Statement II : No torque is acting on the rotating planet. So its angular momentum is constant.

Gravitation

28. The electrical cable of copper has just one wire of radius $9\, mm$ its resistance is $10\,\Omega$ . This single copper wire is replaced by $3$ different well insulated copper wires each of radius $3\, mm$. The total resistance of the cable will now be equal to :

Haryana PMT 2002

29. Assuming that the human pupil has a radius of $\text{0.25} \, cm$ and a comfortable viewing distance of $25 \, cm$ . The minimum separation between two point objects that the human eye can resolve for the light of wavelength $500 \, nm$ is

NTA Abhyas 2020 Wave Optics

30. Units commonly used for measuring wavelength of light and distance between neutron and proton of an atom are

Physical World, Units and Measurements

Physics Questions

Physics Questions

2. A pendulum is suspended from the ceiling of the cart as shown in the figure. Find the horizontal acceleration of the cart for which pendulum will become equally inclined from the horizontal and vertical :-

3. If a school bus, on it's way to school, covers half the distance with velocity $v_1$ and other half with velocity $v_2$. The average velocity of the school bus would be:

5. Half-life of radioactive substance is $3.20 \,h$. What is the time taken for a $75\%$ of substance to be used ?

7. If the tension and diameter of a sonometer wire of fundamental frequency $n$ is doubled and density is halved then its fundamental frequency will become

8. Two coherent point sources $S_1$ and $S_2$ are separated by a small distance ' $d$ ' as shown in figure. The fringes obtained on the screen will be

9. A bar magnet has coercivity of $4 \times 10^3 A m ^{-1}$. It is desired to demagnetise it by inserting it inside a solenoid $12\, cm$ long and having $60$ turns. The current that should be sent through the solenoid is

10. The electric field in a certain region is acting radially outward and is given by $E=$ Ar. The charge contained in a sphere of radius '$a$' centred at the origin of the field, will be given by :

11. A plane is flying horizontally at $98m/s$ and releases an object which reaches the ground in $10$ sec. The angle made by object while
hitting the ground is :

12. A copper wire and a steel wire of the same diameter and length are joined end to end and a force is applied which stretches their combined length by $1 \,cm$. Then the two wires will have

13. Monochromatic light of wavelength $3000 $ is incident on a surface area $4\, cm^ 2$. If intensity of light is $150 \, m\,W/m^2$, then rate at which photons strike the target is

14. If $\vec{A}=\hat{i}+2 \hat{j}-\hat{k}, \vec{B}=-\hat{i}+\hat{j}-2 \hat{k}$, then angle between $\vec{A}$ and $\vec{B}$ is

15. An ideal gas is taken through the cycle $ A\to B\to C\to A, $ as shown in figure. If the net heat supplied to the gas in the cycle is $5 \,J$, the work done by the gas in the process. $ C\to A $ is

16. An ammeter reads up to $1$ ampere. Its internal resistance is $0.81\, ohm$. To increase the range to $10\, A$ the value of the required shunt ( in ohm) is

17. A potentiometer has a uniform wire of length $5\,m$. A battery of emf $10\,V$ and negligible internal resistance is connected between its ends. A secondary cell connected to the circuit gives balancing length at $200 \,cm$. The emf of the secondary cell is

18. An electric potential difference will be induced between ends of the conductor as shown in the diagram, when the conductor moves in the direction

19. The relative permeability is represented by $\mu_r$ and the susceptibility is denoted by $\chi$ for a magnetic substance. Then for a paramagnetic substance

20. What does the term 'relaxation time' refer to in the context of electron motion?

21. A rotating wheel changes angular speed from $1800 \, rpm$ to $3000 \, rpm$ in $20 \, s$ . What is the angular acceleration assuming it to be uniform?

22. A plano convex lens of $\left(\right.f=20 \, cm\left.\right)$ is silvered at plane surface. New $f$ will be

23. Statement I: The speed of sound in solids is maximum though their density is larger than liquid.
Statement II: The coefficient of elasticity of solid is large.

26. A permanent magnet attracts

27. Statement I : For the planets orbiting around the sun, angular speed, linear speed, K.E. changes with time, but angular momentum remains constant.
Statement II : No torque is acting on the rotating planet. So its angular momentum is constant.

28. The electrical cable of copper has just one wire of radius $9\, mm$ its resistance is $10\,\Omega$ . This single copper wire is replaced by $3$ different well insulated copper wires each of radius $3\, mm$. The total resistance of the cable will now be equal to :

29. Assuming that the human pupil has a radius of $\text{0.25} \, cm$ and a comfortable viewing distance of $25 \, cm$ . The minimum separation between two point objects that the human eye can resolve for the light of wavelength $500 \, nm$ is

30. Units commonly used for measuring wavelength of light and distance between neutron and proton of an atom are

Physics Questions

Physics Questions

2. A pendulum is suspended from the ceiling of the cart as shown in the figure. Find the horizontal acceleration of the cart for which pendulum will become equally inclined from the horizontal and vertical :-

3. If a school bus, on it's way to school, covers half the distance with velocity $v_1$ and other half with velocity $v_2$. The average velocity of the school bus would be:

5. Half-life of radioactive substance is $3.20 \,h$. What is the time taken for a $75\%$ of substance to be used ?

7. If the tension and diameter of a sonometer wire of fundamental frequency $n$ is doubled and density is halved then its fundamental frequency will become

8. Two coherent point sources $S_1$ and $S_2$ are separated by a small distance ' $d$ ' as shown in figure. The fringes obtained on the screen will be

9. A bar magnet has coercivity of $4 \times 10^3 A m ^{-1}$. It is desired to demagnetise it by inserting it inside a solenoid $12\, cm$ long and having $60$ turns. The current that should be sent through the solenoid is

10. The electric field in a certain region is acting radially outward and is given by $E=$ Ar. The charge contained in a sphere of radius '$a$' centred at the origin of the field, will be given by :

11. A plane is flying horizontally at $98m/s$ and releases an object which reaches the ground in $10$ sec. The angle made by object while hitting the ground is :

12. A copper wire and a steel wire of the same diameter and length are joined end to end and a force is applied which stretches their combined length by $1 \,cm$. Then the two wires will have

13. Monochromatic light of wavelength $3000 $ is incident on a surface area $4\, cm^ 2$. If intensity of light is $150 \, m\,W/m^2$, then rate at which photons strike the target is

14. If $\vec{A}=\hat{i}+2 \hat{j}-\hat{k}, \vec{B}=-\hat{i}+\hat{j}-2 \hat{k}$, then angle between $\vec{A}$ and $\vec{B}$ is

15. An ideal gas is taken through the cycle $ A\to B\to C\to A, $ as shown in figure. If the net heat supplied to the gas in the cycle is $5 \,J$, the work done by the gas in the process. $ C\to A $ is

16. An ammeter reads up to $1$ ampere. Its internal resistance is $0.81\, ohm$. To increase the range to $10\, A$ the value of the required shunt ( in ohm) is

17. A potentiometer has a uniform wire of length $5\,m$. A battery of emf $10\,V$ and negligible internal resistance is connected between its ends. A secondary cell connected to the circuit gives balancing length at $200 \,cm$. The emf of the secondary cell is

18. An electric potential difference will be induced between ends of the conductor as shown in the diagram, when the conductor moves in the direction

19. The relative permeability is represented by $\mu_r$ and the susceptibility is denoted by $\chi$ for a magnetic substance. Then for a paramagnetic substance

20. What does the term 'relaxation time' refer to in the context of electron motion?

21. A rotating wheel changes angular speed from $1800 \, rpm$ to $3000 \, rpm$ in $20 \, s$ . What is the angular acceleration assuming it to be uniform?

22. A plano convex lens of $\left(\right.f=20 \, cm\left.\right)$ is silvered at plane surface. New $f$ will be

23. Statement I: The speed of sound in solids is maximum though their density is larger than liquid. Statement II: The coefficient of elasticity of solid is large.

26. A permanent magnet attracts

27. Statement I : For the planets orbiting around the sun, angular speed, linear speed, K.E. changes with time, but angular momentum remains constant. Statement II : No torque is acting on the rotating planet. So its angular momentum is constant.

28. The electrical cable of copper has just one wire of radius $9\, mm$ its resistance is $10\,\Omega$ . This single copper wire is replaced by $3$ different well insulated copper wires each of radius $3\, mm$. The total resistance of the cable will now be equal to :

29. Assuming that the human pupil has a radius of $\text{0.25} \, cm$ and a comfortable viewing distance of $25 \, cm$ . The minimum separation between two point objects that the human eye can resolve for the light of wavelength $500 \, nm$ is

30. Units commonly used for measuring wavelength of light and distance between neutron and proton of an atom are

11. A plane is flying horizontally at $98m/s$ and releases an object which reaches the ground in $10$ sec. The angle made by object while
hitting the ground is :

23. Statement I: The speed of sound in solids is maximum though their density is larger than liquid.
Statement II: The coefficient of elasticity of solid is large.

27. Statement I : For the planets orbiting around the sun, angular speed, linear speed, K.E. changes with time, but angular momentum remains constant.
Statement II : No torque is acting on the rotating planet. So its angular momentum is constant.