Physics Question and Answers

1. A smooth semicircular wire track of radius $R$ is fixed in a vertical plane. One end of a massless spring of natural length $\frac{3 R}{4}$ is attached to the lowest point $O$ of the wire track. A small ring of mass $m$ which can slide on the track is attached to the other end of the spring. The ring is held stationary at point $P$ such that the spring makes an angle of $60 ^\circ $ with the vertical. The spring constant $K=\frac{m g}{R}$ . Consider the instant when the ring is released. The normal reaction on the ring by the track is

NTA Abhyas 2022

2. Following charge has maximum frequency of rotation in uniform transverse magnetic field :-

Moving Charges and Magnetism

3. Light with an energy flux of $18 \,W \,cm^{-2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 \,cm^2$, the average force exerted on the surface during a $30$ minute time span is

Electromagnetic Waves

4. A hollow metal sphere of radius $5\, cm$ is charged so that the potential on its surface is $10\, V$. The potential at the centre of the sphere is

Electrostatic Potential and Capacitance

5. The rms velocity of a gas at a certain temperature is $\sqrt{2}$ times than that of the oxygen molecules at that temperature. The gas can be

Kinetic Theory

6. An electron in an excited state of $Li ^{2+}$ ions has angular momentum $\frac{3 h}{2 \pi}$. The de Broglie wavelength of electron in this state is $P \pi a_0$ (where $a_0=$ Bohr radius). The value of $P$ is

Atoms

7. Three waves of equal frequency having amplitudes $10 \, mm$ , $4 \, mm$ , and $7 \, mm$ arrive at a given point with a successive phase difference of $\frac{\pi }{2}$ , the amplitude of the resulting wave in mm is given by

NTA Abhyas 2022

8. Two identical inductance carry currents that vary with time according to linear laws (as shown in figure). In which of two inductance is the selfinduction emf greater?

Electromagnetic Induction

9. In the above graph, what will be the average velocity of the lift?

Motion in a Straight Line

10. A parallel plate air capacitor has capacity $C$. Distance of separation between plates is $d$ and potential difference $V$ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is

Electrostatic Potential and Capacitance

11. A ring of mass m and radius R has three particle attached to the ring as shown in the figure. The centre of the ring has a speed v₀. The kinetic energy of the system is (slipping is absent).

NTA Abhyas 2022

12. In YDSE, light of wavelength $\lambda=5000\,\mathring{A}$ is used, which emerges in phase from two slits a distance $d=3 \times 10^{-7}$ $m$ apart. A transparent sheet of thickness $t=1.5 \times 10^{-7} m$, refractive index $n=1.17$, is placed over one of the slits. Where does the central maxima of the interference now appear from the center of the screen? (Find the value of $y$ ?)

Wave Optics

13. The process of negative feedback in electronics can involve returning a fraction of the output of an operational amplifier to the input. This may affect the gain and the bandwidth (the range of frequency over which the gain is constant). Which one of the following combinations of effects is correct?

Semiconductor Electronics: Materials Devices and Simple Circuits

14. A particle is projected with velocity 100 mis at 30°. Time of flight is

COMEDK 2006 Motion in a Plane

15. The charge density in a nucleus varies with distance from the centre of the nucleus according to the curve in Fig.

Nuclei

16. In an amplitude modulation with modulation index $0.5$, the ratio of the amplitude of the carrier wave to that of the side band in the modulated wave is

KEAM 2012 Communication Systems

17. Keeping the angle of banking of the road constant, the maximum speed of the vehicles is to be increased by $10\%$ . The radius of curvature of the road will have to be changed from $20 \, m$ to

NTA Abhyas 2022

18. A cup of tea cools from $80^{\circ} C$ to $60^{\circ} C$ in one minute. The ambient temperature is $30^{\circ} C$. In cooling from $60^{\circ} C$ to $50^{\circ} C$. It will take

Thermodynamics

19. Three charges $-q,+Q$ and $-q$ are placed at equal distances along a straight line. If the total P.E. of the system is zero, the ratio $\frac{Q}{q}$ becomes

KCET 2026

20. These questions consists of two statements each printed as Assertion (A) and Reason (R). While answering these question you are required to choose any one of the following four responses
Assertion (A) A particle in $X Y$-plane is governed by $x=a \sin \omega t$ and $y=a \cos \omega t$ where $a$ as well as $\omega$ are constants, then the particle will have parabolic motion.
Reason (R) A particle under the influence of mutually perpendicular velocities has curvilinear motion.

Motion in a Plane

21. A water pump driven by petrol raises water at a rate of $0.5\, m^3 / min$ from a depth of $30\, m$ . If the pump is $70 \%$ efficient, what power is developed by the engine?

Work, Energy and Power

22. The direction of the frictional force acting on a book when pressed against a rough vertical wall is:

NTA Abhyas 2020

23. In young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be $(\lambda=6000\,Å)$

Wave Optics

24. A PN junction diode cannot be used

Semiconductor Electronics: Materials Devices and Simple Circuits

25. An atom of mass $M$ which is in the state of rest emits a photon of wavelength $\lambda$. As a result, the atom will deflect with the kinetic energy equal to $(h$ is Planck's constant)

Manipal 2012 Dual Nature of Radiation and Matter

26. Sunlight reaches to us in composite form and not in it's constituent colours because

Ray Optics and Optical Instruments

27. In Young's double'sIit experiment, Let $\beta$ be the fringe width and $I_0$ be the intensity at the central bright fringe. At a distance 'x' from the central bright fringe, the intensity will be.

Wave Optics

28. A heater coil is rated $100 \,W$, $200 \,V$. It is cut into two idential parts. Both parts are connected together in parallel, to the same source of $200 \,V$. The energy liberated per second in the new combination is

Current Electricity

29. An alternating $\operatorname{emf} E=400 \sin 100 \pi t$ is applied to a circuit containing an inductance of $\frac{\sqrt{2}}{\pi} H$. If an AC ammeter is connected in the circuit, its reading will be

Alternating Current

30. Assertion (A): The electric flux through any closed surface surrounding a point charge is independent of the shape and size of the surface.
Reason (R): Gauss's law states that the total flux through a closed surface is proportional to the enclosed charge

Electric Charges and Fields

Physics Questions

Physics Questions

2. Following charge has maximum frequency of rotation in uniform transverse magnetic field :-

3. Light with an energy flux of $18 \,W \,cm^{-2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 \,cm^2$, the average force exerted on the surface during a $30$ minute time span is

4. A hollow metal sphere of radius $5\, cm$ is charged so that the potential on its surface is $10\, V$. The potential at the centre of the sphere is

5. The rms velocity of a gas at a certain temperature is $\sqrt{2}$ times than that of the oxygen molecules at that temperature. The gas can be

6. An electron in an excited state of $Li ^{2+}$ ions has angular momentum $\frac{3 h}{2 \pi}$. The de Broglie wavelength of electron in this state is $P \pi a_0$ (where $a_0=$ Bohr radius). The value of $P$ is

7. Three waves of equal frequency having amplitudes $10 \, mm$ , $4 \, mm$ , and $7 \, mm$ arrive at a given point with a successive phase difference of $\frac{\pi }{2}$ , the amplitude of the resulting wave in mm is given by

8. Two identical inductance carry currents that vary with time according to linear laws (as shown in figure). In which of two inductance is the selfinduction emf greater?

9. In the above graph, what will be the average velocity of the lift?

10. A parallel plate air capacitor has capacity $C$. Distance of separation between plates is $d$ and potential difference $V$ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is

11. A ring of mass m and radius R has three particle attached to the ring as shown in the figure. The centre of the ring has a speed v₀. The kinetic energy of the system is (slipping is absent).

14. A particle is projected with velocity 100 mis at 30°. Time of flight is

15. The charge density in a nucleus varies with distance from the centre of the nucleus according to the curve in Fig.

16. In an amplitude modulation with modulation index $0.5$, the ratio of the amplitude of the carrier wave to that of the side band in the modulated wave is

17. Keeping the angle of banking of the road constant, the maximum speed of the vehicles is to be increased by $10\%$ . The radius of curvature of the road will have to be changed from $20 \, m$ to

18. A cup of tea cools from $80^{\circ} C$ to $60^{\circ} C$ in one minute. The ambient temperature is $30^{\circ} C$. In cooling from $60^{\circ} C$ to $50^{\circ} C$. It will take

19. Three charges $-q,+Q$ and $-q$ are placed at equal distances along a straight line. If the total P.E. of the system is zero, the ratio $\frac{Q}{q}$ becomes

21. A water pump driven by petrol raises water at a rate of $0.5\, m^3 / min$ from a depth of $30\, m$ . If the pump is $70 \%$ efficient, what power is developed by the engine?

22. The direction of the frictional force acting on a book when pressed against a rough vertical wall is:

23. In young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be $(\lambda=6000\,Å)$

24. A PN junction diode cannot be used

25. An atom of mass $M$ which is in the state of rest emits a photon of wavelength $\lambda$. As a result, the atom will deflect with the kinetic energy equal to $(h$ is Planck's constant)

26. Sunlight reaches to us in composite form and not in it's constituent colours because

27. In Young's double'sIit experiment, Let $\beta$ be the fringe width and $I_0$ be the intensity at the central bright fringe. At a distance 'x' from the central bright fringe, the intensity will be.

28. A heater coil is rated $100 \,W$, $200 \,V$. It is cut into two idential parts. Both parts are connected together in parallel, to the same source of $200 \,V$. The energy liberated per second in the new combination is

29. An alternating $\operatorname{emf} E=400 \sin 100 \pi t$ is applied to a circuit containing an inductance of $\frac{\sqrt{2}}{\pi} H$. If an AC ammeter is connected in the circuit, its reading will be

30. Assertion (A): The electric flux through any closed surface surrounding a point charge is independent of the shape and size of the surface.
Reason (R): Gauss's law states that the total flux through a closed surface is proportional to the enclosed charge

Physics Questions

Physics Questions

2. Following charge has maximum frequency of rotation in uniform transverse magnetic field :-

3. Light with an energy flux of $18 \,W \,cm^{-2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 \,cm^2$, the average force exerted on the surface during a $30$ minute time span is

4. A hollow metal sphere of radius $5\, cm$ is charged so that the potential on its surface is $10\, V$. The potential at the centre of the sphere is

5. The rms velocity of a gas at a certain temperature is $\sqrt{2}$ times than that of the oxygen molecules at that temperature. The gas can be

6. An electron in an excited state of $Li ^{2+}$ ions has angular momentum $\frac{3 h}{2 \pi}$. The de Broglie wavelength of electron in this state is $P \pi a_0$ (where $a_0=$ Bohr radius). The value of $P$ is

7. Three waves of equal frequency having amplitudes $10 \, mm$ , $4 \, mm$ , and $7 \, mm$ arrive at a given point with a successive phase difference of $\frac{\pi }{2}$ , the amplitude of the resulting wave in mm is given by

8. Two identical inductance carry currents that vary with time according to linear laws (as shown in figure). In which of two inductance is the selfinduction emf greater?

9. In the above graph, what will be the average velocity of the lift?

10. A parallel plate air capacitor has capacity $C$. Distance of separation between plates is $d$ and potential difference $V$ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is

11. A ring of mass m and radius R has three particle attached to the ring as shown in the figure. The centre of the ring has a speed v0. The kinetic energy of the system is (slipping is absent).

14. A particle is projected with velocity 100 mis at 30°. Time of flight is

15. The charge density in a nucleus varies with distance from the centre of the nucleus according to the curve in Fig.

16. In an amplitude modulation with modulation index $0.5$, the ratio of the amplitude of the carrier wave to that of the side band in the modulated wave is

17. Keeping the angle of banking of the road constant, the maximum speed of the vehicles is to be increased by $10\%$ . The radius of curvature of the road will have to be changed from $20 \, m$ to

18. A cup of tea cools from $80^{\circ} C$ to $60^{\circ} C$ in one minute. The ambient temperature is $30^{\circ} C$. In cooling from $60^{\circ} C$ to $50^{\circ} C$. It will take

19. Three charges $-q,+Q$ and $-q$ are placed at equal distances along a straight line. If the total P.E. of the system is zero, the ratio $\frac{Q}{q}$ becomes

21. A water pump driven by petrol raises water at a rate of $0.5\, m^3 / min$ from a depth of $30\, m$ . If the pump is $70 \%$ efficient, what power is developed by the engine?

22. The direction of the frictional force acting on a book when pressed against a rough vertical wall is:

23. In young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be $(\lambda=6000\,Å)$

24. A PN junction diode cannot be used

25. An atom of mass $M$ which is in the state of rest emits a photon of wavelength $\lambda$. As a result, the atom will deflect with the kinetic energy equal to $(h$ is Planck's constant)

26. Sunlight reaches to us in composite form and not in it's constituent colours because

27. In Young's double'sIit experiment, Let $\beta$ be the fringe width and $I_0$ be the intensity at the central bright fringe. At a distance 'x' from the central bright fringe, the intensity will be.

28. A heater coil is rated $100 \,W$, $200 \,V$. It is cut into two idential parts. Both parts are connected together in parallel, to the same source of $200 \,V$. The energy liberated per second in the new combination is

29. An alternating $\operatorname{emf} E=400 \sin 100 \pi t$ is applied to a circuit containing an inductance of $\frac{\sqrt{2}}{\pi} H$. If an AC ammeter is connected in the circuit, its reading will be

30. Assertion (A): The electric flux through any closed surface surrounding a point charge is independent of the shape and size of the surface. Reason (R): Gauss's law states that the total flux through a closed surface is proportional to the enclosed charge

11. A ring of mass m and radius R has three particle attached to the ring as shown in the figure. The centre of the ring has a speed v₀. The kinetic energy of the system is (slipping is absent).

30. Assertion (A): The electric flux through any closed surface surrounding a point charge is independent of the shape and size of the surface.
Reason (R): Gauss's law states that the total flux through a closed surface is proportional to the enclosed charge