16569 + Interview Questions in Physics

1.	According to Charle's law, increase in volume for 1∘C rise in temperature is
Answer» According to Charle's law, increase in volume for $1^{\circ} C$ rise in temperature is

Discussion

2.	If the current in a wire is flowing in the vertically downward direction and a magnetic field is applied from west to east, what is the direction ofr force on the wire ?
Answer» If the current in a wire is flowing in the vertically downward direction and a magnetic field is applied from west to east, what is the direction ofr force on the wire ?

Discussion

3.	What is the advantage of the third wire of earth connection in domestic appliances?
Answer» What is the advantage of the third wire of earth connection in domestic appliances?

Discussion

4.	If 2 pendulums of equal lengths are taken and suspended from an elastic string, they have same natural frequency and thus if one pendulum is displaced from mean position, the other also starts vibrating under resonance. But why there is a sharing of or transfer of energy between them and why their vibrations are in phase i.e., why when one amplitude is maximum, then the other pendulum has minimum amplitude?
Answer» If 2 pendulums of equal lengths are taken and suspended from an elastic string, they have same natural frequency and thus if one pendulum is displaced from mean position, the other also starts vibrating under resonance. But why there is a sharing of or transfer of energy between them and why their vibrations are in phase i.e., why when one amplitude is maximum, then the other pendulum has minimum amplitude?

Discussion

5.	Derivation of joule's law of heating
Answer» Derivation of joule's law of heating

Discussion

6.	Why ammeter burns out when connected in parallel?
Answer» Why ammeter burns out when connected in parallel?

Discussion

7.	The coil to which we give current for the production of the magnetic field is the primary coil and the coil in which induced emf is generated is known as?
Answer» The coil to which we give current for the production of the magnetic field is the primary coil and the coil in which induced emf is generated is known as?

Discussion

8.	Why is emergent ray parallel to the incident ray after coming out through a rectangular glass slab?
Answer» Why is emergent ray parallel to the incident ray after coming out through a rectangular glass slab?

Discussion

9.	Which one of the following would be most likely to undergo thermonuclear fusion?
Answer» Which one of the following would be most likely to undergo thermonuclear fusion?

Discussion

10.	Why does our plam feel cold, when we put some acetone/petrol/perfume on it?
Answer» Why does our plam feel cold, when we put some acetone/petrol/perfume on it?

Discussion

11.	Soldiers are not allowed to march to cross suspension bridges. Why?
Answer» Soldiers are not allowed to march to cross suspension bridges. Why?

Discussion

12.	Electric supply of a house is through a 10 A fuse. When a 2000 W heater is used in this house, how many 100 W bulbs can be used simultaneously? The supply is at 220 V, and the heater and the bulbs are rated for 220 V.
Answer» Electric supply of a house is through a $10 A$ fuse. When a $2000 W$ heater is used in this house, how many $100 W$ bulbs can be used simultaneously? The supply is at $220 V$ , and the heater and the bulbs are rated for $220 V$ .

Discussion

13.	What is dispersion?
Answer» What is dispersion?

Discussion

14.	As at my home the electricity comes from thermal power plant. Which is generates with the help of AC generator. Am I true? As I learnt that in AC generator the direction of current changes. So why don't when I use a current tester device it's LED blinks. And only light up in one word of socket not in another? please answer me fast. Please
Answer» As at my home the electricity comes from thermal power plant. Which is generates with the help of AC generator. Am I true? As I learnt that in AC generator the direction of current changes. So why don't when I use a current tester device it's LED blinks. And only light up in one word of socket not in another? please answer me fast. Please

Discussion

15.	Choose the incorrect statement regarding wind power:
Answer» Choose the incorrect statement regarding wind power:

Discussion

16.	What is light and what is its nature?
Answer» What is light and what is its nature?

Discussion

17.	Question 13 (b) A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (ii) withdrawn from inside the coil?
Answer» Question 13 (b) A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (ii) withdrawn from inside the coil?

Discussion

18.	Sun appears flattened at sunset and sunrise.pls explain in detail
Answer» Sun appears flattened at sunset and sunrise.pls explain in detail

Discussion

19.	Define current. Is it a scalar quantity or a vector quantity? What is meant by the conventional direction of current? [3 MARKS]
Answer» Define current. Is it a scalar quantity or a vector quantity? What is meant by the conventional direction of current? [3 MARKS]

Discussion

20.	How many major rivers in India have an action plan for conservation and sustenance? __
Answer» How many major rivers in India have an action plan for conservation and sustenance? __

Discussion

21.	The type of single pulley that can act as a force multiplier is a
Answer» The type of single pulley that can act as a force multiplier is a

Discussion

22.	A 5g piece of ice at −20∘C is put into 10g of water at 30∘C. Assuming that heat is enchanged only between the ice and the water, find the final temperature of the mixture. Specific heat capacity of ice =2100Jkg−1∘C−1. Specific heat capacity of water =4200Jkg−1∘C−1 and latent heat of fusion of ice 3.36×105 J kg−1.
Answer» A 5g piece of ice at $- 20^{\circ}$ C is put into 10g of water at $30^{\circ}$ C. Assuming that heat is enchanged only between the ice and the water, find the final temperature of the mixture. Specific heat capacity of ice $= 2100 J k g^{- 1}^{\circ} C^{- 1}$ . Specific heat capacity of water $= 4200 J k g^{- 1}^{\circ} C^{- 1}$ and latent heat of fusion of ice $3.36 \times 10^{5} J k g^{- 1}$ .

Discussion

23.	What is the shape of a P-V curve for an ideal gas?
Answer» What is the shape of a P-V curve for an ideal gas?

Discussion

24.	A satellite orbiting earth in a circular orbit of radius 4Re is suddenly stopped and then released. This satellite then fall onto surface of earth at speed of √nGMRe then n is [where Re is radius of earth] (Answer upto two digits after the decimal point.)
Answer» A satellite orbiting earth in a circular orbit of radius $4 R_{e}$ is suddenly stopped and then released. This satellite then fall onto surface of earth at speed of $\sqrt{\frac{n G M}{R_{e}}}$ then n is [where $R_{e}$ is radius of earth] (Answer upto two digits after the decimal point.)

Discussion

25.	For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of convex lens is : (a) 20 cm (b) 10 cm (c) 15 cm (d) 40 cm
Answer» For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of convex lens is : (a) 20 cm (b) 10 cm (c) 15 cm (d) 40 cm

25.

For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of convex lens is : (a) 20 cm (b) 10 cm (c) 15 cm (d) 40 cm

Answer»

For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of convex lens is :

(a) 20 cm (b) 10 cm (c) 15 cm (d) 40 cm

Discussion

26.	How does the resistance of a wire vary with its: (a) area of cross- sefction? (b) diameter?
Answer» How does the resistance of a wire vary with its: (a) area of cross- sefction? (b) diameter?

Discussion

27.	A diverging lens has a focal length of 0.10 m. The power of this lens will be : (a) + 10.0 D (b) + 1.0 D (c) - 1.0 D (d) - 10.0 D
Answer» A diverging lens has a focal length of 0.10 m. The power of this lens will be : (a) + 10.0 D (b) + 1.0 D (c) - 1.0 D (d) - 10.0 D

Discussion

28.	Select the fuel that has high calorific value, burns readily and can be used as fuel in homes and automobiles.
Answer» Select the fuel that has high calorific value, burns readily and can be used as fuel in homes and automobiles.

Discussion

29.	A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels. (a) Name the form of energy. (b) Is this energy ultimately derived from the sun or not? (c) Explain how this form of energy can be converted into electricity. (d) What is the minimum temperature difference in water at the surface of ocean and its deeper level which is required to operate power plants based on this energy?
Answer» A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels. (a) Name the form of energy. (b) Is this energy ultimately derived from the sun or not? (c) Explain how this form of energy can be converted into electricity. (d) What is the minimum temperature difference in water at the surface of ocean and its deeper level which is required to operate power plants based on this energy?

Discussion

30.	What type of reactions occurring inside the sun produce solar energy ?
Answer» What type of reactions occurring inside the sun produce solar energy ?

Discussion

31.	A block of ice at - 10∘C is slowly heated and converted to steam at 100∘C. Which of the following curves represent the phenomenon qualitatively?
Answer» A block of ice at - $10^{\circ} C$ is slowly heated and converted to steam at $100^{\circ} C$ . Which of the following curves represent the phenomenon qualitatively?

Discussion

32.	How does the intensity of scattered light depend on the wavelength of incident light ? State the condition when its dependence hold.
Answer» How does the intensity of scattered light depend on the wavelength of incident light ? State the condition when its dependence hold.

Discussion

33.	(a) A beam of monochromatic light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base ? (b) If white light is used in same way as in part (a) above, what change do you expect in the emergent beam ? (c) What conclusion do you draw about the nature of white light in part (b) ?
Answer» (a) A beam of monochromatic light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base ? (b) If white light is used in same way as in part (a) above, what change do you expect in the emergent beam ? (c) What conclusion do you draw about the nature of white light in part (b) ?

33.

(a) A beam of monochromatic light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base ? (b) If white light is used in same way as in part (a) above, what change do you expect in the emergent beam ? (c) What conclusion do you draw about the nature of white light in part (b) ?

Answer»

(a) A beam of monochromatic light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base ?

(b) If white light is used in same way as in part (a) above, what change do you expect in the emergent beam ?

(c) What conclusion do you draw about the nature of white light in part (b) ?

Discussion

34.	The current which flows only in one direction and which we get from a battery is:
Answer» The current which flows only in one direction and which we get from a battery is:

Discussion

35.	Find the equivalent resistance across A & B in the given circuit.
Answer» Find the equivalent resistance across A & B in the given circuit.

35.

Find the equivalent resistance across A & B in the given circuit.

Answer»

Find the equivalent resistance across A & B in the given circuit.

Discussion

36.	Which among the following options is a pair of exhaustible natural resources?
Answer» Which among the following options is a pair of exhaustible natural resources?

Discussion

37.	Choose the correct option.
Answer» Choose the correct option.

Discussion

38.	Choose the incorrect statement :
Answer» Choose the incorrect statement :

Discussion

39.	The angle between the normal at the point of incidence and the reflected ray is known as:
Answer» The angle between the normal at the point of incidence and the reflected ray is known as:

Discussion

40.	How does the fan help us in keeping cool?
Answer» How does the fan help us in keeping cool?

Discussion

41.	The above diagram shows the arrangement for observing scattering of light in colloidal solution. Why does the beaker appears blue ?
Answer» The above diagram shows the arrangement for observing scattering of light in colloidal solution. Why does the beaker appears blue ?

41.

The above diagram shows the arrangement for observing scattering of light in colloidal solution. Why does the beaker appears blue ?

Answer»

The above diagram shows the arrangement for observing scattering of light in colloidal solution. Why does the beaker appears blue ?

Discussion

42.	Which of the following is not a reason behind rainbow formation?
Answer» Which of the following is not a reason behind rainbow formation?

Discussion

43.	If the speed of light in air is 3 × 108 m/s and speed of light in water is reduced by a factor of 1.3 when compared with that of the speed of light in air. Find out the speed of light in water?
Answer» If the speed of light in air is 3 $\times$ $10^{8}$ m/s and speed of light in water is reduced by a factor of 1.3 when compared with that of the speed of light in air. Find out the speed of light in water?

Discussion

44.	A mass m1 has a velocity of u and mass m2 has a velocity of v. Then find the individual momentum of mass m1 and mass m2 respectively.
Answer» A mass m₁ has a velocity of u and mass m₂ has a velocity of v. Then find the individual momentum of mass m₁ and mass m₂ respectively.

Discussion

45.	A set of parallel rays are incident on the biconvex lens. If after two refractions and one reflection, final image is formed at 15cm before the lens, then the value of x18 is ___ cm.
Answer» A set of parallel rays are incident on the biconvex lens. If after two refractions and one reflection, final image is formed at 15cm before the lens, then the value of $\frac{x}{18}$ is ___ cm.

Discussion

46.	A uniform cylinder of length L and mass M having cross - sectional area A is suspended with its length vertical from a fixed point by a massless spring such that it is half submerged in a liquid of density σ at equilibrium position. The extension of the spring when it is in equilibrium is:
Answer» A uniform cylinder of length L and mass M having cross - sectional area A is suspended with its length vertical from a fixed point by a massless spring such that it is half submerged in a liquid of density σ at equilibrium position. The extension of the spring when it is in equilibrium is:

Discussion

47.	Name one of the common defects of vision and the type of lens used to remove it.
Answer» Name one of the common defects of vision and the type of lens used to remove it.

Discussion

48.	Find the equivalent resistance across the points A and B in the given circuit.
Answer» Find the equivalent resistance across the points A and B in the given circuit.

48.

Find the equivalent resistance across the points A and B in the given circuit.

Answer»

Find the equivalent resistance across the points A and B in the given circuit.

Discussion

49.	If we completely annihilate a hair of your body that has a mass of 1 μg, how much energy will we get in the process?
Answer» If we completely annihilate a hair of your body that has a mass of $1 μg$ , how much energy will we get in the process?

Discussion

50.	The image formed by a convex mirror is: (a) erect and diminished (b) erect and enlarged (c) inverted and diminished (d) inverted and enlarged.
Answer» The image formed by a convex mirror is: (a) erect and diminished (b) erect and enlarged (c) inverted and diminished (d) inverted and enlarged.

50.

The image formed by a convex mirror is: (a) erect and diminished (b) erect and enlarged (c) inverted and diminished (d) inverted and enlarged.

Answer»

The image formed by a convex mirror is:

(a) erect and diminished

(b) erect and enlarged

(c) inverted and diminished

(d) inverted and enlarged.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

According to Charle's law, increase in volume for 1∘C rise in temperature is

If the current in a wire is flowing in the vertically downward direction and a magnetic field is applied from west to east, what is the direction ofr force on the wire ?

What is the advantage of the third wire of earth connection in domestic appliances?

Derivation of joule's law of heating

Why ammeter burns out when connected in parallel?

The coil to which we give current for the production of the magnetic field is the primary coil and the coil in which induced emf is generated is known as?

Why is emergent ray parallel to the incident ray after coming out through a rectangular glass slab?

Which one of the following would be most likely to undergo thermonuclear fusion?

Why does our plam feel cold, when we put some acetone/petrol/perfume on it?

Soldiers are not allowed to march to cross suspension bridges. Why?

Electric supply of a house is through a 10 A fuse. When a 2000 W heater is used in this house, how many 100 W bulbs can be used simultaneously? The supply is at 220 V, and the heater and the bulbs are rated for 220 V.

What is dispersion?

Choose the incorrect statement regarding wind power:

What is light and what is its nature?

Question 13 (b) A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (ii) withdrawn from inside the coil?

Sun appears flattened at sunset and sunrise.pls explain in detail

Define current. Is it a scalar quantity or a vector quantity? What is meant by the conventional direction of current? [3 MARKS]

How many major rivers in India have an action plan for conservation and sustenance? __

The type of single pulley that can act as a force multiplier is a

What is the shape of a P-V curve for an ideal gas?

A satellite orbiting earth in a circular orbit of radius 4Re is suddenly stopped and then released. This satellite then fall onto surface of earth at speed of √nGMRe then n is [where Re is radius of earth] (Answer upto two digits after the decimal point.)

For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of convex lens is : (a) 20 cm (b) 10 cm (c) 15 cm (d) 40 cm

How does the resistance of a wire vary with its: (a) area of cross- sefction? (b) diameter?

A diverging lens has a focal length of 0.10 m. The power of this lens will be : (a) + 10.0 D (b) + 1.0 D (c) - 1.0 D (d) - 10.0 D

Select the fuel that has high calorific value, burns readily and can be used as fuel in homes and automobiles.

What type of reactions occurring inside the sun produce solar energy ?

A block of ice at - 10∘C is slowly heated and converted to steam at 100∘C. Which of the following curves represent the phenomenon qualitatively?

How does the intensity of scattered light depend on the wavelength of incident light ? State the condition when its dependence hold.

The current which flows only in one direction and which we get from a battery is:

Find the equivalent resistance across A &amp; B in the given circuit.

Which among the following options is a pair of exhaustible natural resources?

Choose the correct option.

Choose the incorrect statement :

The angle between the normal at the point of incidence and the reflected ray is known as:

How does the fan help us in keeping cool?

The above diagram shows the arrangement for observing scattering of light in colloidal solution. Why does the beaker appears blue ?

Which of the following is not a reason behind rainbow formation?

If the speed of light in air is 3 × 108 m/s and speed of light in water is reduced by a factor of 1.3 when compared with that of the speed of light in air. Find out the speed of light in water?

A mass m1 has a velocity of u and mass m2 has a velocity of v. Then find the individual momentum of mass m1 and mass m2 respectively.

A set of parallel rays are incident on the biconvex lens. If after two refractions and one reflection, final image is formed at 15cm before the lens, then the value of x18 is ___ cm.

A uniform cylinder of length L and mass M having cross - sectional area A is suspended with its length vertical from a fixed point by a massless spring such that it is half submerged in a liquid of density σ at equilibrium position. The extension of the spring when it is in equilibrium is:

Name one of the common defects of vision and the type of lens used to remove it.

Find the equivalent resistance across the points A and B in the given circuit.

If we completely annihilate a hair of your body that has a mass of 1 μg, how much energy will we get in the process?

The image formed by a convex mirror is: (a) erect and diminished (b) erect and enlarged (c) inverted and diminished (d) inverted and enlarged.

Find the equivalent resistance across A & B in the given circuit.