16569 + Interview Questions in Physics

1.	Which of the following are the types of microphones used in day to day life?
Answer» Which of the following are the types of microphones used in day to day life?

Discussion

2.	How will the magnitude of magnification changes as an object placed at the center of curvature is moved towards focus?
Answer» How will the magnitude of magnification changes as an object placed at the center of curvature is moved towards focus?

Discussion

3.	The absolute refractive indices of glass and water are 43 and 32. If the speed of light in glass is 2×108 ms−1, calculate the speed of light in (i) vacuum, (ii) water.
Answer» The absolute refractive indices of glass and water are $\frac{4}{3}$ and $\frac{3}{2}$ . If the speed of light in glass is $2 \times 10^{8} {m s}^{- 1}$ , calculate the speed of light in (i) vacuum, (ii) water.

Discussion

4.	Question 6 What is the maximum resistance which can be made using five resistors each of 15Ω? (a) 15Ω (b) 10 Ω (c) 5 Ω (d) 1 Ω
Answer» Question 6 What is the maximum resistance which can be made using five resistors each of $\frac{1}{5} Ω$ ? (a) $\frac{1}{5} Ω$ (b) $10 Ω$ (c) $5 Ω$ (d) $1 Ω$

Discussion

5.	What is bench charge?
Answer» What is bench charge?

Discussion

6.	Find the electric current that flows through a conductor if a charge of 4.2 C flows through it in 2.1 seconds.
Answer» Find the electric current that flows through a conductor if a charge of $4.2 C$ flows through it in $2.1 s e c o n d s$ .

Discussion

7.	Refractive indices of four media A, B, C and D are given below : MediumRefractive indexA1.33B1.44C1.52D1.65 In which of these four media is the speed of light (1) maximum, and (ii) minimum ?
Answer» Refractive indices of four media A, B, C and D are given below : $MediumRefractive indexA1.33B1.44C1.52D1.65$ In which of these four media is the speed of light (1) maximum, and (ii) minimum ?

7.

Refractive indices of four media A, B, C and D are given below : MediumRefractive indexA1.33B1.44C1.52D1.65 In which of these four media is the speed of light (1) maximum, and (ii) minimum ?

Answer»

Refractive indices of four media A, B, C and D are given below :

$MediumRefractive indexA1.33B1.44C1.52D1.65$

In which of these four media is the speed of light (1) maximum, and (ii) minimum ?

Discussion

8.	Choose the correct answer regarding the weight of an object.
Answer» Choose the correct answer regarding the weight of an object.

Discussion

9.	Why is the plane mirror show vertical image instead of horizontal image ? Explain with reason
Answer» Why is the plane mirror show vertical image instead of horizontal image ? Explain with reason

Discussion

10.	A plane mirror is approaching you at 10 cm s−1. Your image shall approach you with a speed of:
Answer» A plane mirror is approaching you at 10 cm $s^{- 1}$ . Your image shall approach you with a speed of:

Discussion

11.	Fill in the following blank with a suitable word : When a ray of light goes from air into a clear material, you see the ray bend. How much the ray bends is determined by the ___ of the material.
Answer» Fill in the following blank with a suitable word : When a ray of light goes from air into a clear material, you see the ray bend. How much the ray bends is determined by the ___ of the material.

Discussion

12.	Why does the electricity always taken as the opposite direction of the electrons?
Answer» Why does the electricity always taken as the opposite direction of the electrons?

Discussion

13.	A current carrying conductor is placed perpendicular to the magnetic field of horse shoe magnet the conductor is displaced upwards what will happen to the displacement of the conductor if (i) current in the conductor is increased (ii) a horse shoe magnet is replaced by another stronger horse shoe magnet and (iii) the length of the conductor is increased
Answer» A current carrying conductor is placed perpendicular to the magnetic field of horse shoe magnet the conductor is displaced upwards what will happen to the displacement of the conductor if (i) current in the conductor is increased (ii) a horse shoe magnet is replaced by another stronger horse shoe magnet and (iii) the length of the conductor is increased

Discussion

14.	What is magnetic moment?
Answer» What is magnetic moment?

Discussion

15.	Why we use petrol or diesel in vehicles instead of using coal or any other fuel?
Answer» Why we use petrol or diesel in vehicles instead of using coal or any other fuel?

Discussion

16.	An electric heater of resistance 8 ohm draws 15C of charge per second suppose it happens for a period of 2 hours, calculate the heat energy derived by the heater.
Answer» An electric heater of resistance 8 ohm draws 15C of charge per second suppose it happens for a period of 2 hours, calculate the heat energy derived by the heater.

Discussion

17.	The most rapidly dwindling natural resorce in the world is: (a) water (b) soil (c) sunlight (d) forests
Answer» The most rapidly dwindling natural resorce in the world is: (a) water (b) soil (c) sunlight (d) forests

Discussion

18.	If an object is placed at 60 cm before lens I focal length of lens I is 30 cm and focal length of lens II is 45 cm., find out the image distance formed by lens II from O.
Answer» If an object is placed at 60 cm before lens I focal length of lens I is 30 cm and focal length of lens II is 45 cm., find out the image distance formed by lens II from O.

18.

If an object is placed at 60 cm before lens I focal length of lens I is 30 cm and focal length of lens II is 45 cm., find out the image distance formed by lens II from O.

Answer»

If an object is placed at 60 cm before lens I focal length of lens I is 30 cm and focal length of lens II is 45 cm., find out the image distance formed by lens II from O.

Discussion

19.	Estimated value of solar constant is:
Answer» Estimated value of solar constant is:

Discussion

20.	The gas in a refrigerator causes cooling on expansion because: (a) The density of gas goes down (b) Heat of the gas is lost as work is done by the gas (c) Work done by the gas is converted into he
Answer» The gas in a refrigerator causes cooling on expansion because: (a) The density of gas goes down (b) Heat of the gas is lost as work is done by the gas (c) Work done by the gas is converted into he

Discussion

21.	Light travels more quickly through water than through glass. (a) Which is optically denser : water or glass ? (b) If a ray of light passes from glass into water, which way will it bend : towards the normal or away from the normal ?
Answer» Light travels more quickly through water than through glass. (a) Which is optically denser : water or glass ? (b) If a ray of light passes from glass into water, which way will it bend : towards the normal or away from the normal ?

Discussion

22.	Say, you have three resistors of resistance 30 ohm each. How many different values of effective resistance can you find by making different arrangements with these?
Answer» Say, you have three resistors of resistance 30 ohm each. How many different values of effective resistance can you find by making different arrangements with these?

Discussion

23.	(a) Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? Why? (b) Chrismas tree lamps are usually wired in series. What happens if one lamp breaks? (c) An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring? (d) Draw a circuit diagram showing two electric lamps connected in parallel together with a cell and a switch that works both lamps. Mark an A on your diagram to show where an ammeter should be placed to measure the current.
Answer» (a) Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? Why? (b) Chrismas tree lamps are usually wired in series. What happens if one lamp breaks? (c) An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring? (d) Draw a circuit diagram showing two electric lamps connected in parallel together with a cell and a switch that works both lamps. Mark an A on your diagram to show where an ammeter should be placed to measure the current.

Discussion

24.	Is joules law of heating effect similar to heating effect of electric current. If no state the difference
Answer» Is joules law of heating effect similar to heating effect of electric current. If no state the difference

Discussion

25.	By imparting heat to a body, its temperature rises by 15∘C. What is the corresponding rise in temperature on kelvin scale?
Answer» By imparting heat to a body, its temperature rises by $15^{\circ} C$ . What is the corresponding rise in temperature on kelvin scale?

Discussion

26.	Which of the following disease is caused by ultraviolet radiations of sun?
Answer» Which of the following disease is caused by ultraviolet radiations of sun?

Discussion

27.	A substance is in the form of a solid at 0 °C. The amount of heat added to this substance and the temperature of the substance are plotted on the graph. Fig, 11.9 Amount of heat (in Joule) If the specific heat capacity of the solid substance is 500 J/kg °C, find from the graph; the specific Latent heat of fusion of the substance in the liquid state.
Answer» A substance is in the form of a solid at 0 °C. The amount of heat added to this substance and the temperature of the substance are plotted on the graph. Fig, 11.9 Amount of heat (in Joule) If the specific heat capacity of the solid substance is 500 J/kg °C, find from the graph; the specific Latent heat of fusion of the substance in the liquid state.

27.

A substance is in the form of a solid at 0 °C. The amount of heat added to this substance and the temperature of the substance are plotted on the graph. Fig, 11.9 Amount of heat (in Joule) If the specific heat capacity of the solid substance is 500 J/kg °C, find from the graph; the specific Latent heat of fusion of the substance in the liquid state.

Answer»

A substance is in the form of a solid at 0 °C. The amount of heat added to this substance and the temperature of the substance are plotted on the graph.

Fig, 11.9 Amount of heat (in Joule)

If the specific heat capacity of the solid substance is 500 J/kg °C, find from the graph; the specific Latent heat of fusion of the substance in the liquid state.

Discussion

28.	The diagrams show the appearance of a fork when placed in front of and close to two mirrors A and B, turn by turn. (a) Which mirror is convex ? (b) Which mirror is concave ? Give reasons for your choice.
Answer» The diagrams show the appearance of a fork when placed in front of and close to two mirrors A and B, turn by turn. (a) Which mirror is convex ? (b) Which mirror is concave ? Give reasons for your choice.

28.

The diagrams show the appearance of a fork when placed in front of and close to two mirrors A and B, turn by turn. (a) Which mirror is convex ? (b) Which mirror is concave ? Give reasons for your choice.

Answer»

The diagrams show the appearance of a fork when placed in front of and close to two mirrors A and B, turn by turn. (a) Which mirror is convex ? (b) Which mirror is concave ? Give reasons for your choice.

Discussion

29.	Define balanced forces.
Answer» Define balanced forces.

Discussion

30.	A pulley system has velocity ratio of 3. If it efficiency is 75%, calculate its mechanical advantage. [Assume 1 kgf = 10N, 1 gf = 1000 dynes]
Answer» A pulley system has velocity ratio of 3. If it efficiency is 75%, calculate its mechanical advantage. [Assume 1 kgf = 10N, 1 gf = 1000 dynes]

Discussion

31.	How are high temperatures achieved in solar cookers?
Answer» How are high temperatures achieved in solar cookers?

Discussion

32.	What is/are the demerits of Nuclear Power Station?
Answer» What is/are the demerits of Nuclear Power Station?

Discussion

33.	A nucleus breaks into two parts whose velocities are in the ratio 2 : 1. The ratio of their radius is
Answer» A nucleus breaks into two parts whose velocities are in the ratio 2 : 1. The ratio of their radius is

Discussion

34.	Vijay is pulling a block with 22 N force and Gopal is pulling it with 10 N force in opposite direction. Vijay is able to pull the block total distance 6.5 m. Find the net work done.
Answer» Vijay is pulling a block with 22 N force and Gopal is pulling it with 10 N force in opposite direction. Vijay is able to pull the block total distance 6.5 m. Find the net work done.

Discussion

35.	If two forces as shown in the given figure are 6 N and 4N are acting opposite. The mass of the object is 2kg. What is the acceleration of the mass?
Answer» If two forces as shown in the given figure are 6 N and 4N are acting opposite. The mass of the object is 2kg. What is the acceleration of the mass?

35.

If two forces as shown in the given figure are 6 N and 4N are acting opposite. The mass of the object is 2kg. What is the acceleration of the mass?

Answer»

If two forces as shown in the given figure are 6 N and 4N are acting opposite. The mass of the object is 2kg. What is the acceleration of the mass?

Discussion

36.	Which of the following is not a consequence of establishing hydroelectric power plants? (a) displacement of people (b) production of methane (c) occurrence of floods (d) ecological disturbance
Answer» Which of the following is not a consequence of establishing hydroelectric power plants? (a) displacement of people (b) production of methane (c) occurrence of floods (d) ecological disturbance

Discussion

37.	value of current in the diagram will be
Answer» value of current in the diagram will be

Discussion

38.	To obtain a magnification of, -2 with a convex lens of focal length 10 cm, the object should be placed : (a) between 5 cm and 10 cm (h) between 10 cm and 20 cm (c) at 20 cm (d) beyond 20 cm
Answer» To obtain a magnification of, -2 with a convex lens of focal length 10 cm, the object should be placed : (a) between 5 cm and 10 cm (h) between 10 cm and 20 cm (c) at 20 cm (d) beyond 20 cm

Discussion

39.	Name the principle on which a transformer works. Can a transformer work when connected to a D.C. source?
Answer» Name the principle on which a transformer works. Can a transformer work when connected to a D.C. source?

Discussion

40.	Which fuel is considered to be formed in the secondary stage of coal formation?
Answer» Which fuel is considered to be formed in the secondary stage of coal formation?

Discussion

41.	In the given diagram, if the arrow shows the direction of current then where will the north pole is assumed to be?
Answer» In the given diagram, if the arrow shows the direction of current then where will the north pole is assumed to be?

Discussion

42.	The process by which a beam of white light splits into its constituent colours is known as
Answer» The process by which a beam of white light splits into its constituent colours is known as

Discussion

43.	An object of height 4.0 cm is placed at a distance of 30 cm from optical centre 'O' of a convex lens of focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O' and principal focus 'F' on the diagram. Also find the approximate ratio of size of image to the size of object.
Answer» An object of height 4.0 cm is placed at a distance of 30 cm from optical centre 'O' of a convex lens of focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O' and principal focus 'F' on the diagram. Also find the approximate ratio of size of image to the size of object.

Discussion

44.	What name is given to the device which automatically cuts off the electricity supply during short-circuiting in household wiring ?
Answer» What name is given to the device which automatically cuts off the electricity supply during short-circuiting in household wiring ?

Discussion

45.	Ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror is as follows. The formula of the focal length of the lens is:
Answer» Ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror is as follows. The formula of the focal length of the lens is:

45.

Ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror is as follows. The formula of the focal length of the lens is:

Answer»

Ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror is as follows. The formula of the focal length of the lens is:

Discussion

46.	The diagram below shows part of a circuit: If this arrangement of three resistors was to be replaced by a single resisitor, its resistance should be (a)9Ω(b)4Ω(c)6Ω(d)18Ω
Answer» The diagram below shows part of a circuit: If this arrangement of three resistors was to be replaced by a single resisitor, its resistance should be $(a) 9 Ω (b) 4 Ω (c) 6 Ω (d) 18 Ω$

Discussion

47.	The SI unit of electric current is __
Answer» The SI unit of electric current is __

Discussion

48.	A coil of insulated copper wire is connected to a galvanometer. If a bar magnet is held stationary inside the coil then there is a deflection in the galvanometer. ___ (True/False)
Answer» A coil of insulated copper wire is connected to a galvanometer. If a bar magnet is held stationary inside the coil then there is a deflection in the galvanometer. ___ (True/False)

Discussion

49.	A spherical mirror and a thin spherical lens have each a focal length of -12 cm. The mirror and the lens are likely to be:
Answer» A spherical mirror and a thin spherical lens have each a focal length of -12 cm. The mirror and the lens are likely to be:

Discussion

50.	Why we don't we see two images, as we have two eyes and two retina
Answer» Why we don't we see two images, as we have two eyes and two retina

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following are the types of microphones used in day to day life?

How will the magnitude of magnification changes as an object placed at the center of curvature is moved towards focus?

The absolute refractive indices of glass and water are 43 and 32. If the speed of light in glass is 2×108 ms−1, calculate the speed of light in (i) vacuum, (ii) water.

Question 6 What is the maximum resistance which can be made using five resistors each of 15Ω? (a) 15Ω (b) 10 Ω (c) 5 Ω (d) 1 Ω

What is bench charge?

Find the electric current that flows through a conductor if a charge of 4.2 C flows through it in 2.1 seconds.

Refractive indices of four media A, B, C and D are given below : MediumRefractive indexA1.33B1.44C1.52D1.65 In which of these four media is the speed of light (1) maximum, and (ii) minimum ?

Choose the correct answer regarding the weight of an object.

Why is the plane mirror show vertical image instead of horizontal image ? Explain with reason

A plane mirror is approaching you at 10 cm s−1. Your image shall approach you with a speed of:

Fill in the following blank with a suitable word : When a ray of light goes from air into a clear material, you see the ray bend. How much the ray bends is determined by the ___ of the material.

Why does the electricity always taken as the opposite direction of the electrons?

What is magnetic moment?

Why we use petrol or diesel in vehicles instead of using coal or any other fuel?

An electric heater of resistance 8 ohm draws 15C of charge per second suppose it happens for a period of 2 hours, calculate the heat energy derived by the heater.

The most rapidly dwindling natural resorce in the world is: (a) water (b) soil (c) sunlight (d) forests

If an object is placed at 60 cm before lens I focal length of lens I is 30 cm and focal length of lens II is 45 cm., find out the image distance formed by lens II from O.

Estimated value of solar constant is:

The gas in a refrigerator causes cooling on expansion because: (a) The density of gas goes down (b) Heat of the gas is lost as work is done by the gas (c) Work done by the gas is converted into he

Light travels more quickly through water than through glass. (a) Which is optically denser : water or glass ? (b) If a ray of light passes from glass into water, which way will it bend : towards the normal or away from the normal ?

Say, you have three resistors of resistance 30 ohm each. How many different values of effective resistance can you find by making different arrangements with these?

Is joules law of heating effect similar to heating effect of electric current. If no state the difference

By imparting heat to a body, its temperature rises by 15∘C. What is the corresponding rise in temperature on kelvin scale?

Which of the following disease is caused by ultraviolet radiations of sun?

The diagrams show the appearance of a fork when placed in front of and close to two mirrors A and B, turn by turn. (a) Which mirror is convex ? (b) Which mirror is concave ? Give reasons for your choice.

Define balanced forces.

A pulley system has velocity ratio of 3. If it efficiency is 75%, calculate its mechanical advantage. [Assume 1 kgf = 10N, 1 gf = 1000 dynes]

How are high temperatures achieved in solar cookers?

What is/are the demerits of Nuclear Power Station?

A nucleus breaks into two parts whose velocities are in the ratio 2 : 1. The ratio of their radius is

Vijay is pulling a block with 22 N force and Gopal is pulling it with 10 N force in opposite direction. Vijay is able to pull the block total distance 6.5 m. Find the net work done.

If two forces as shown in the given figure are 6 N and 4N are acting opposite. The mass of the object is 2kg. What is the acceleration of the mass?

Which of the following is not a consequence of establishing hydroelectric power plants? (a) displacement of people (b) production of methane (c) occurrence of floods (d) ecological disturbance

value of current in the diagram will be

To obtain a magnification of, -2 with a convex lens of focal length 10 cm, the object should be placed : (a) between 5 cm and 10 cm (h) between 10 cm and 20 cm (c) at 20 cm (d) beyond 20 cm

Name the principle on which a transformer works. Can a transformer work when connected to a D.C. source?

Which fuel is considered to be formed in the secondary stage of coal formation?

In the given diagram, if the arrow shows the direction of current then where will the north pole is assumed to be?

The process by which a beam of white light splits into its constituent colours is known as

What name is given to the device which automatically cuts off the electricity supply during short-circuiting in household wiring ?

Ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror is as follows. The formula of the focal length of the lens is:

The diagram below shows part of a circuit: If this arrangement of three resistors was to be replaced by a single resisitor, its resistance should be (a)9Ω(b)4Ω(c)6Ω(d)18Ω

The SI unit of electric current is __

A coil of insulated copper wire is connected to a galvanometer. If a bar magnet is held stationary inside the coil then there is a deflection in the galvanometer. ___ (True/False)

A spherical mirror and a thin spherical lens have each a focal length of -12 cm. The mirror and the lens are likely to be:

Why we don't we see two images, as we have two eyes and two retina