16569 + Interview Questions in Physics

1.	Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
Answer» Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Discussion

2.	Give one example each where high specific heat capacity of water is used (i) In cooling, (ii) As heat reservoir.
Answer» Give one example each where high specific heat capacity of water is used (i) In cooling, (ii) As heat reservoir.

Discussion

3.	10. Vapour pressure of one molal aqueous solution of agno3 at the normal boiling point of water assuming 100% ionisation is
Answer» 10. Vapour pressure of one molal aqueous solution of agno3 at the normal boiling point of water assuming 100% ionisation is

Discussion

4.	A student gets a blurred image of a distant object on a screen which is fixed at a place. In order to obtain a sharp image on the screen, he will have to shift the mirror:(1) towards the screen(2) away from the screen(3) either towards or away from the screen(4) very far away from the screen
Answer» A student gets a blurred image of a distant object on a screen which is fixed at a place. In order to obtain a sharp image on the screen, he will have to shift the mirror: (1) towards the screen (2) away from the screen (3) either towards or away from the screen (4) very far away from the screen

Discussion

5.	The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings make the surroundings cold.Explain this simply
Answer» The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings make the surroundings cold. Explain this simply

Discussion

6.	An object is placed at 30 cm in front of a convex lens of focal length 20 cm. Find the position of the image. What is the magnification of the object? [4 MARKS]
Answer» An object is placed at 30 cm in front of a convex lens of focal length 20 cm. Find the position of the image. What is the magnification of the object? [4 MARKS]

Discussion

7.	How prism produces spectrum .and what happen if water droplet is circular in rainbow formation
Answer» How prism produces spectrum .and what happen if water droplet is circular in rainbow formation

Discussion

8.	Why is it that all like charges repel and unlike charges attract? What causes them to do so?
Answer» Why is it that all like charges repel and unlike charges attract? What causes them to do so?

8.

Why is it that all like charges repel and unlike charges attract? What causes them to do so?

Answer»

Why is it that all like charges repel and unlike charges attract?

What causes them to do so?

Discussion

9.	Due to a change in which of the following properties matter can change from one state to another?
Answer» Due to a change in which of the following properties matter can change from one state to another?

Discussion

10.	11. What amount of energy is required for making a500 kg body escape from the Earth?(Given g = 10 m/s2 and radius of Earth = 6 × 106m)(1) 3 x 109 J(3) 3 x 1010 J(2) 1.5 x 109 J18(4) 6 x 1010 J
Answer» 11. What amount of energy is required for making a500 kg body escape from the Earth?(Given g = 10 m/s2 and radius of Earth = 6 × 106m)(1) 3 x 109 J(3) 3 x 1010 J(2) 1.5 x 109 J18(4) 6 x 1010 J

Discussion

11.	A ray of light passes from vacuum into a medium of refractive index μ. If the angle of incidence is twice the angle of refraction, then the angle of incidence is,
Answer» A ray of light passes from vacuum into a medium of refractive index $μ$ . If the angle of incidence is twice the angle of refraction, then the angle of incidence is,

Discussion

12.	A thin lens has a focal length −25 cm. Calculate the power of lens in dioptre.-4
Answer» A thin lens has a focal length $- 25 c m$ . Calculate the power of lens in dioptre. -4

Discussion

13.	Find the potential difference across the resistor, when 125 J of heat is produced each second in a 5 Ω resistor.
Answer» Find the potential difference across the resistor, when $125 J$ of heat is produced each second in a $5 Ω$ resistor.

Discussion

14.	Calculate the power of an electric pump that can lift 600 kg of water from the ground into a tank placed at a height of 1200 cm in 10 seconds.
Answer» Calculate the power of an electric pump that can lift $600 kg$ of water from the ground into a tank placed at a height of $1200 cm$ in $10$ seconds.

Discussion

15.	2 coils of self inductance to 2MH and 8 MH are placed so close together that the effective flux in one coil is completely linked with the other the mutual inductance between these coil is
Answer» 2 coils of self inductance to 2MH and 8 MH are placed so close together that the effective flux in one coil is completely linked with the other the mutual inductance between these coil is

Discussion

16.	All of the following are greenhouse gases except_____________. (a) Methane(b) Carbon dioxide(c) Ammonia
Answer» All of the following are greenhouse gases except_____________. (a) Methane (b) Carbon dioxide (c) Ammonia

Discussion

17.	Why do we be able to see a fast moving train when we concentrate our eye on it.
Answer» Why do we be able to see a fast moving train when we concentrate our eye on it.

Discussion

18.	Alpha and beta particles are deflected in an electric or a magnetic field but gamma rays are not deflected in such a field because
Answer» Alpha and beta particles are deflected in an electric or a magnetic field but gamma rays are not deflected in such a field because

Discussion

19.	How to find the Electric field intensity due to thin arc and how to put the limits at the time of integration??
Answer» How to find the Electric field intensity due to thin arc and how to put the limits at the time of integration??

Discussion

20.	A light ray is incident on an inclined glass-air interface as shown. The largest angle ϕ for which the light ray is totally reflected at the surface AC is -
Answer» A light ray is incident on an inclined glass-air interface as shown. The largest angle $ϕ$ for which the light ray is totally reflected at the surface $AC$ is -

Discussion

21.	A biconvex lens of refractive index 1.5 has a focal length of 10cm. Calculate the radius of curvature. Find the position and nature of the image of an object held at a distance of 10cm from the lens
Answer» A biconvex lens of refractive index 1.5 has a focal length of 10cm. Calculate the radius of curvature. Find the position and nature of the image of an object held at a distance of 10cm from the lens

Discussion

22.	Why does the sun appear red at sunset ?
Answer» Why does the sun appear red at sunset ?

Discussion

23.	49. What is the net electric field,E at point P due to this charged U-shaped structure?( linear charge density= lambda, +Q charge is uniformly distributed on that structure)
Answer» 49. What is the net electric field,E at point P due to this charged U-shaped structure?( linear charge density= lambda, +Q charge is uniformly distributed on that structure)

Discussion

24.	Two balls are thrown upward simultaneously with speed 45m/s and 60m/s. Relative position of second ball with respect to first ball at t=6 is what
Answer» Two balls are thrown upward simultaneously with speed 45m/s and 60m/s. Relative position of second ball with respect to first ball at t=6 is what

Discussion

25.	Find the length of the astronomical telescope if it is adjusted such that the final image is formed at the least distance of distinct vision. Focal length of objective lens and eyepiece are 80 cm and 5 cm respectively.
Answer» Find the length of the astronomical telescope if it is adjusted such that the final image is formed at the least distance of distinct vision. Focal length of objective lens and eyepiece are $80 cm$ and $5 cm$ respectively.

Discussion

26.	The values of two resistors are R1 = (6 ± 0.3) kG and R2 (10 + 0.2) ko. The percentage error in the equivalent resistance when they are connected in parallel is
Answer» The values of two resistors are R1 = (6 ± 0.3) kG and R2 (10 + 0.2) ko. The percentage error in the equivalent resistance when they are connected in parallel is

Discussion

27.	What are the forced vibrations ? Give one example to illustrate your answer.
Answer» What are the forced vibrations ? Give one example to illustrate your answer.

Discussion

28.	71.The resistance between the terminal point P and Q of given infinitly long circuit will be
Answer» 71.The resistance between the terminal point P and Q of given infinitly long circuit will be

Discussion

29.	The electric needs of an artificial satellite are fulfilled by using
Answer» The electric needs of an artificial satellite are fulfilled by using

Discussion

30.	length of wire is l and resis†an ce is 18 ohm. the wire is bent into an equilateral triangle then resis†an ce of any side is
Answer» length of wire is l and resis†an ce is 18 ohm. the wire is bent into an equilateral triangle then resis†an ce of any side is

Discussion

31.	How reflection of sound wave is possible from open end of open organ pipe
Answer» How reflection of sound wave is possible from open end of open organ pipe

Discussion

32.	balance the following equation by ionelectron method P+OH^-→ H2PO2^-+PH3+H20
Answer» balance the following equation by ionelectron method P+OH^-→ H2PO2^-+PH3+H20

Discussion

33.	Select the region in the graph that specifies latent heat of fusion.
Answer» Select the region in the graph that specifies latent heat of fusion.

Discussion

34.	You have been appointed as the 'eco club incharge' of your school. You have to take care of the maintenance and conservation of the environment. (i) Suggest any three ways by which you will carry on your duties. (ii) Write any three qualities that you would like your school mates to develop for environment conservation.
Answer» You have been appointed as the 'eco club incharge' of your school. You have to take care of the maintenance and conservation of the environment. (i) Suggest any three ways by which you will carry on your duties. (ii) Write any three qualities that you would like your school mates to develop for environment conservation.

Discussion

35.	A body when acted upon by a force of 10kgf gets displaced by 0.5m calculate the work done by the force when the displacement is in the direction of force
Answer» A body when acted upon by a force of 10kgf gets displaced by 0.5m calculate the work done by the force when the displacement is in the direction of force

Discussion

36.	A home owner uses 4.00×103 m3 of methane (CH4) gas, (assume (CH4) is an ideal gas) in a year to heat his home. Under the pressure of 1.0 atm and 300 K, mass of gas used is x×105 g. The value of x is____.(Nearest integer)(Given R=0.083 L atm K−1 mol−1)
Answer» A home owner uses $4.00 \times 10^{3} m^{3}$ of methane $(C H_{4})$ gas, (assume $(C H_{4})$ is an ideal gas) in a year to heat his home. Under the pressure of $1.0 a t m$ and $300 K$ , mass of gas used is $x \times 10^{5} g$ . The value of $x$ is____.(Nearest integer) (Given $R = 0.083 L a t m K^{- 1} m o l^{- 1}$ )

Discussion

37.	OaWhat is the direction of induced currents in metal rings 1 and 2 whercurrent I in the wire is increasing steadily?2
Answer» OaWhat is the direction of induced currents in metal rings 1 and 2 whercurrent I in the wire is increasing steadily?2

Discussion

38.	A body staring from rest is accelerated by an applied force f aacting on it.If the mass of the object is m find the expression of displacement covered by the body in n seconds .Given the mass of body M
Answer» A body staring from rest is accelerated by an applied force f aacting on it.If the mass of the object is m find the expression of displacement covered by the body in n seconds .Given the mass of body M

Discussion

39.	Types of Physical equilibrium
Answer» Types of Physical equilibrium

Discussion

40.	An object is placed at a distance of 30 cm from the lens. Its image is formed at a distance of 10 cm on the same side of the lens. Find the focal length of the lens used.
Answer» An object is placed at a distance of $30 c m$ from the lens. Its image is formed at a distance of $10 c m$ on the same side of the lens. Find the focal length of the lens used.

Discussion

41.	If the amount of electric charge passing through a conductor in 10 minutes is 300 C, the current flowing is (a) 30 A (b) 0.3 A (c) 0.5 A (d) 5 A
Answer» If the amount of electric charge passing through a conductor in 10 minutes is 300 C, the current flowing is (a) 30 A (b) 0.3 A (c) 0.5 A (d) 5 A

Discussion

42.	Two capacitors of capacitances 3 μ F and 6μ Fare charged to a potential of 12 V each. They are now connected to each other with the positive plate of one joined to the negative plate of the other. Thepotential difference across each will be(1) 3 V(2) Zero(3) 6 V(4) 4 V
Answer» Two capacitors of capacitances 3 μ F and 6μ Fare charged to a potential of 12 V each. They are now connected to each other with the positive plate of one joined to the negative plate of the other. Thepotential difference across each will be(1) 3 V(2) Zero(3) 6 V(4) 4 V

Discussion

43.	A convex lens forms an image of an object on a screen 30 cm from the lens. When the lens is moved 90 cm towards the object, the image is again formed on the screen. Then the focal length of the lens is
Answer» A convex lens forms an image of an object on a screen $30 cm$ from the lens. When the lens is moved $90 cm$ towards the object, the image is again formed on the screen. Then the focal length of the lens is

Discussion

44.	An object is placed at a distance 2f from the pole of a convex mirror of focal length f. Then, the magnification is ?
Answer» An object is placed at a distance 2f from the pole of a convex mirror of focal length f. Then, the magnification is ?

Discussion

45.	Where does electrolysis take place ?
Answer» Where does electrolysis take place ?

Discussion

46.	Find the current through the 10 Ω resistor shown in figure.
Answer» Find the current through the $10 Ω$ resistor shown in figure.

Discussion

47.	What are the cathode rays constituted of?
Answer» What are the cathode rays constituted of?

Discussion

48.	The plank of a seesaw is 8 m long and is supported at the centre. Neil, who weighs 80 kgf sits at a distance of 3 m from the fulcrum. John sits 4 m from the fulcrum to balance the plank. What is John's weight?60
Answer» The plank of a seesaw is $8 m$ long and is supported at the centre. Neil, who weighs $80 kgf$ sits at a distance of $3 m$ from the fulcrum. John sits $4 m$ from the fulcrum to balance the plank. What is John's weight? 60

Discussion

49.	Assertion:- If a unit north pole rotates around a current carrying wire then work has to be done . Reason:- Magnetic feild produced by current is always non- conservative in nature.
Answer» Assertion:- If a unit north pole rotates around a current carrying wire then work has to be done . Reason:- Magnetic feild produced by current is always non- conservative in nature.

Discussion

50.	How many bulbs of resistance 6ohms should be joined in parallel to draw a current of 2 amperes from a battery of 3 volts
Answer» How many bulbs of resistance 6ohms should be joined in parallel to draw a current of 2 amperes from a battery of 3 volts

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Give one example each where high specific heat capacity of water is used (i) In cooling, (ii) As heat reservoir.

10. Vapour pressure of one molal aqueous solution of agno3 at the normal boiling point of water assuming 100% ionisation is

A student gets a blurred image of a distant object on a screen which is fixed at a place. In order to obtain a sharp image on the screen, he will have to shift the mirror:(1) towards the screen(2) away from the screen(3) either towards or away from the screen(4) very far away from the screen

The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings make the surroundings cold.Explain this simply

An object is placed at 30 cm in front of a convex lens of focal length 20 cm. Find the position of the image. What is the magnification of the object? [4 MARKS]

How prism produces spectrum .and what happen if water droplet is circular in rainbow formation

Why is it that all like charges repel and unlike charges attract? What causes them to do so?

Due to a change in which of the following properties matter can change from one state to another?

11. What amount of energy is required for making a500 kg body escape from the Earth?(Given g = 10 m/s2 and radius of Earth = 6 × 106m)(1) 3 x 109 J(3) 3 x 1010 J(2) 1.5 x 109 J18(4) 6 x 1010 J

A ray of light passes from vacuum into a medium of refractive index μ. If the angle of incidence is twice the angle of refraction, then the angle of incidence is,

A thin lens has a focal length −25 cm. Calculate the power of lens in dioptre.-4

Find the potential difference across the resistor, when 125 J of heat is produced each second in a 5 Ω resistor.

Calculate the power of an electric pump that can lift 600 kg of water from the ground into a tank placed at a height of 1200 cm in 10 seconds.

2 coils of self inductance to 2MH and 8 MH are placed so close together that the effective flux in one coil is completely linked with the other the mutual inductance between these coil is

All of the following are greenhouse gases except_____________. (a) Methane(b) Carbon dioxide(c) Ammonia

Why do we be able to see a fast moving train when we concentrate our eye on it.

Alpha and beta particles are deflected in an electric or a magnetic field but gamma rays are not deflected in such a field because

How to find the Electric field intensity due to thin arc and how to put the limits at the time of integration??

A light ray is incident on an inclined glass-air interface as shown. The largest angle ϕ for which the light ray is totally reflected at the surface AC is -

A biconvex lens of refractive index 1.5 has a focal length of 10cm. Calculate the radius of curvature. Find the position and nature of the image of an object held at a distance of 10cm from the lens

Why does the sun appear red at sunset ?

49. What is the net electric field,E at point P due to this charged U-shaped structure?( linear charge density= lambda, +Q charge is uniformly distributed on that structure)

Two balls are thrown upward simultaneously with speed 45m/s and 60m/s. Relative position of second ball with respect to first ball at t=6 is what

Find the length of the astronomical telescope if it is adjusted such that the final image is formed at the least distance of distinct vision. Focal length of objective lens and eyepiece are 80 cm and 5 cm respectively.

The values of two resistors are R1 = (6 ± 0.3) kG and R2 (10 + 0.2) ko. The percentage error in the equivalent resistance when they are connected in parallel is

What are the forced vibrations ? Give one example to illustrate your answer.

71.The resistance between the terminal point P and Q of given infinitly long circuit will be

The electric needs of an artificial satellite are fulfilled by using

length of wire is l and resis†an ce is 18 ohm. the wire is bent into an equilateral triangle then resis†an ce of any side is

How reflection of sound wave is possible from open end of open organ pipe

balance the following equation by ionelectron method P+OH^-→ H2PO2^-+PH3+H20

Select the region in the graph that specifies latent heat of fusion.

A body when acted upon by a force of 10kgf gets displaced by 0.5m calculate the work done by the force when the displacement is in the direction of force

A home owner uses 4.00×103 m3 of methane (CH4) gas, (assume (CH4) is an ideal gas) in a year to heat his home. Under the pressure of 1.0 atm and 300 K, mass of gas used is x×105 g. The value of x is____.(Nearest integer)(Given R=0.083 L atm K−1 mol−1)

OaWhat is the direction of induced currents in metal rings 1 and 2 whercurrent I in the wire is increasing steadily?2

A body staring from rest is accelerated by an applied force f aacting on it.If the mass of the object is m find the expression of displacement covered by the body in n seconds .Given the mass of body M

Types of Physical equilibrium

An object is placed at a distance of 30 cm from the lens. Its image is formed at a distance of 10 cm on the same side of the lens. Find the focal length of the lens used.

If the amount of electric charge passing through a conductor in 10 minutes is 300 C, the current flowing is (a) 30 A (b) 0.3 A (c) 0.5 A (d) 5 A

Two capacitors of capacitances 3 μ F and 6μ Fare charged to a potential of 12 V each. They are now connected to each other with the positive plate of one joined to the negative plate of the other. Thepotential difference across each will be(1) 3 V(2) Zero(3) 6 V(4) 4 V

A convex lens forms an image of an object on a screen 30 cm from the lens. When the lens is moved 90 cm towards the object, the image is again formed on the screen. Then the focal length of the lens is

An object is placed at a distance 2f from the pole of a convex mirror of focal length f​​​​​​. Then, the magnification is ?

Where does electrolysis take place ?

Find the current through the 10 Ω resistor shown in figure.

What are the cathode rays constituted of?

The plank of a seesaw is 8 m long and is supported at the centre. Neil, who weighs 80 kgf sits at a distance of 3 m from the fulcrum. John sits 4 m from the fulcrum to balance the plank. What is John's weight?60

Assertion:- If a unit north pole rotates around a current carrying wire then work has to be done . Reason:- Magnetic feild produced by current is always non- conservative in nature.

How many bulbs of resistance 6ohms should be joined in parallel to draw a current of 2 amperes from a battery of 3 volts

An object is placed at a distance 2f from the pole of a convex mirror of focal length f. Then, the magnification is ?