16569 + Interview Questions in Physics

1.	Find the Fahrenheit equivalent for 50∘C.
Answer» Find the Fahrenheit equivalent for $50^{\circ} C$ .

Discussion

2.	Which of the following sources of energy are not derived from the sun ? Biomass, wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy
Answer» Which of the following sources of energy are not derived from the sun ? Biomass, wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy

Discussion

3.	Which characteristic of sound makes it possible to recognize a person by his voice without seeing him?
Answer» Which characteristic of sound makes it possible to recognize a person by his voice without seeing him?

Discussion

4.	Which of the following is not a bio mass fuel?
Answer» Which of the following is not a bio mass fuel?

Discussion

5.	Suppose there is a uniform metre scale floating in space. Let's say I apply a force of 10N at the 10 cm mark in anticlockwise direction and I apply a force of 5N on the 100 cm mark in clockwise direction. Now what will happen to the scale? Plz explain. Thanks
Answer» Suppose there is a uniform metre scale floating in space. Let's say I apply a force of 10N at the 10 cm mark in anticlockwise direction and I apply a force of 5N on the 100 cm mark in clockwise direction. Now what will happen to the scale? Plz explain. Thanks

5.

Suppose there is a uniform metre scale floating in space. Let's say I apply a force of 10N at the 10 cm mark in anticlockwise direction and I apply a force of 5N on the 100 cm mark in clockwise direction. Now what will happen to the scale? Plz explain. Thanks

Answer»

Suppose there is a uniform metre scale floating in space. Let's say I apply a force of 10N at the 10 cm mark in anticlockwise direction and I apply a force of 5N on the 100 cm mark in clockwise direction. Now what will happen to the scale?

Plz explain. Thanks

Discussion

6.	A box of weight 50 kg rests on the surface of a lift. If the lift begins to fall freely under gravity, what is the force with which the box applies force on the surface?
Answer» A box of weight 50 kg rests on the surface of a lift. If the lift begins to fall freely under gravity, what is the force with which the box applies force on the surface?

Discussion

7.	An object is placed 36 cm from a convex lens. A real image is formed 24 cm from the lens. Calculate the focal length of the lens.
Answer» An object is placed 36 cm from a convex lens. A real image is formed 24 cm from the lens. Calculate the focal length of the lens.

Discussion

8.	Draw the pattern of magnetic field lines of a current carrying solenoid. What does the pattern of field lines inside the solenoid indicate? Write one application of magnetic field of current carrying solenoid. [5 MARKS]
Answer» Draw the pattern of magnetic field lines of a current carrying solenoid. What does the pattern of field lines inside the solenoid indicate? Write one application of magnetic field of current carrying solenoid. [5 MARKS]

Discussion

9.	Which among the following are true?
Answer» Which among the following are true?

Discussion

10.	Find the length of AE, given the lengths CD = X m, BH = H m. __
Answer» Find the length of AE, given the lengths CD = X m, BH = H m. __

10.

Find the length of AE, given the lengths CD = X m, BH = H m. __

Answer»

Find the length of AE, given the lengths CD = X m, BH = H m.

__

Discussion

11.	When the light ray is ___________ to the boundary between two medium, light does not bend.
Answer» When the light ray is ___________ to the boundary between two medium, light does not bend.

Discussion

12.	The atmospheric refraction of light causes the twinkling of : (a) planets only (b) stars only (c) planets and stars (d) stars and satellites
Answer» The atmospheric refraction of light causes the twinkling of : (a) planets only (b) stars only (c) planets and stars (d) stars and satellites

Discussion

13.	When an object is placed at a distance of 36 cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is placed at a distance of : (a) 10 cm from the lens ? (b) 20 cm from the lens ?
Answer» When an object is placed at a distance of 36 cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is placed at a distance of : (a) 10 cm from the lens ? (b) 20 cm from the lens ?

13.

When an object is placed at a distance of 36 cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is placed at a distance of : (a) 10 cm from the lens ? (b) 20 cm from the lens ?

Answer»

When an object is placed at a distance of 36 cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is placed at a distance of :

(a) 10 cm from the lens ?

(b) 20 cm from the lens ?

Discussion

14.	What are the various steps which can be taken to control (or reduce) pollution caused by burning fossil fuels?
Answer» What are the various steps which can be taken to control (or reduce) pollution caused by burning fossil fuels?

Discussion

15.	A current carrying conductor placed in magnetic field experiences a force. The magnitude of force experienced by a current carrying conductor in magnetic field can be increased by:
Answer» A current carrying conductor placed in magnetic field experiences a force. The magnitude of force experienced by a current carrying conductor in magnetic field can be increased by:

Discussion

16.	(a) why do electricians wear rubber hand gloves while working with electricty? (b) what p.d. is needed to send a current of 6 A through an electrical appliance having a resistance of 40Ω ?
Answer» (a) why do electricians wear rubber hand gloves while working with electricty? (b) what p.d. is needed to send a current of 6 A through an electrical appliance having a resistance of $40 Ω$ ?

Discussion

17.	Statement I: Fossil fuels are a renewable source of energy. Statement II: Renewable sources are collected from resources which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.
Answer» Statement I: Fossil fuels are a renewable source of energy. Statement II: Renewable sources are collected from resources which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.

Discussion

18.	Why the armature as used as a stator?
Answer» Why the armature as used as a stator?

Discussion

19.	Write the expression for the heat energy Q received by m kg of a substance of specific heat capacity c J kg−1 K−1 when it is heated through △t ∘C.
Answer» Write the expression for the heat energy Q received by m kg of a substance of specific heat capacity c J k $g^{- 1} K^{- 1}$ when it is heated through $△ t^{\circ} C$ .

19.

Write the expression for the heat energy Q received by m kg of a substance of specific heat capacity c J kg−1 K−1 when it is heated through △t ∘C.

Answer»

Write the expression for the heat energy Q received by m kg of a substance of specific heat capacity c J k $g^{- 1} K^{- 1}$ when it is heated through $△ t^{\circ} C$ .

Discussion

20.	What will be the diameter of the image of the moon formed by a spherical concave mirror of focal length 7.6 m?The diameter of the moon is 3450 km and the distance between the earth and the moon is 3.8×105 km.
Answer» What will be the diameter of the image of the moon formed by a spherical concave mirror of focal length 7.6 m?The diameter of the moon is 3450 km and the distance between the earth and the moon is $3.8 \times 10^{5}$ km.

Discussion

21.	A resistor has a resistance fo 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?
Answer» A resistor has a resistance fo 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?

Discussion

22.	Electric/electrical Switches are always connected to:
Answer» Electric/electrical Switches are always connected to:

22.

Electric/electrical Switches are always connected to:

Answer»

Electric/electrical Switches are always connected to:

Discussion

23.	The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5s−1 after 2 hours. The initial count rate was
Answer» The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to $5 s^{- 1}$ after 2 hours. The initial count rate was

Discussion

24.	Prateek travels 25m towards south, then he turns left and travels 30m, and then turns right and travels 15m. How far is he from the starting point?
Answer» Prateek travels 25m towards south, then he turns left and travels 30m, and then turns right and travels 15m. How far is he from the starting point?

Discussion

25.	Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistors and two insulators.
Answer» Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistors and two insulators.

Discussion

26.	Name the unit used to measure the sound level.
Answer» Name the unit used to measure the sound level.

Discussion

27.	What is the mass of an alpha particle?
Answer» What is the mass of an alpha particle?

Discussion

28.	Calculate the resistance of 2 km long copper wire of radius 2mm if resistivity of copper = 1.72 × 10 ^ - 8
Answer» Calculate the resistance of 2 km long copper wire of radius 2mm if resistivity of copper = 1.72 × 10 ^ - 8

Discussion

29.	When 0.2 kg of brass at 100°C is dropped into 0.5 kg of water at 20°C,calculate the specific heat of brass.
Answer» When 0.2 kg of brass at 100°C is dropped into 0.5 kg of water at 20°C,calculate the specific heat of brass.

Discussion

30.	Hospitals buy 400-L cylinders of oxygen gas compressed at 150 atm. They administer oxygen to patients at 3.0 atm in a hyperbaric oxygen chamber. What volume of oxygen can a cylinder supply at this pressure?
Answer» Hospitals buy 400-L cylinders of oxygen gas compressed at 150 atm. They administer oxygen to patients at 3.0 atm in a hyperbaric oxygen chamber. What volume of oxygen can a cylinder supply at this pressure?

Discussion

31.	What is interference of light?
Answer» What is interference of light?

Discussion

32.	An object of height 2 cm is placed at a distance of 15 CM in front of concave lens of power -100 . Find the size of the image
Answer» An object of height 2 cm is placed at a distance of 15 CM in front of concave lens of power -100 . Find the size of the image

Discussion

33.	How did peoples measured light's speed?
Answer» How did peoples measured light's speed?

Discussion

34.	What is the formula to calculate the pitch of a screw gauge?
Answer» What is the formula to calculate the pitch of a screw gauge?

Discussion

35.	A lens of focal length 12cm forms an erect image three times the size of the object. The distance between the object and the image is A)8cm. B)16cm. C)24cm. D)36cm
Answer» A lens of focal length 12cm forms an erect image three times the size of the object. The distance between the object and the image is A)8cm. B)16cm. C)24cm. D)36cm

Discussion

36.	State and explain Maxwell's right-hand thumb rule.
Answer» State and explain Maxwell's right-hand thumb rule.

Discussion

37.	A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incidence is: (a) 0∘(b)45∘(c)60∘(d)90∘
Answer» A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incidence is: (a) $0^{\circ} (b) 45^{\circ} (c) 60^{\circ} (d) 90^{\circ}$

37.

A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incidence is: (a) 0∘(b)45∘(c)60∘(d)90∘

Answer»

A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incidence is:

(a) $0^{\circ} (b) 45^{\circ} (c) 60^{\circ} (d) 90^{\circ}$

Discussion

38.	Sir/Madam, I am not totally clear with the topic- EMF ? Can you explain theory is simplified way?
Answer» Sir/Madam, I am not totally clear with the topic- EMF ? Can you explain theory is simplified way?

Discussion

39.	In a hydroelectric power plant, waterfalls at a rate of 1000 kg/s from a height of 100 m. Assuming that 50% of the energy of falling water is converted into electrical energy, calculate the power generated per second.(take g=9.8 ms−2)
Answer» In a hydroelectric power plant, waterfalls at a rate of 1000 kg/s from a height of 100 m. Assuming that 50% of the energy of falling water is converted into electrical energy, calculate the power generated per second. $(t a k e g = 9.8 m s^{- 2})$

Discussion

40.	With the help of a labelled ray-diagram, describe how a plane mirror forms an image of a point source of light placed in front of it. State the characteristics of the image formed in a plane mirror.
Answer» With the help of a labelled ray-diagram, describe how a plane mirror forms an image of a point source of light placed in front of it. State the characteristics of the image formed in a plane mirror.

Discussion

41.	Explain clearly why, a person who has lost the sight of one eye is at a disadvantage compared with the normal person who has two good eyes.
Answer» Explain clearly why, a person who has lost the sight of one eye is at a disadvantage compared with the normal person who has two good eyes.

Discussion

42.	Magnification produced by a plane mirror is : (a) less than one (b) greater than one (c) zero (d) equal to one
Answer» Magnification produced by a plane mirror is : (a) less than one (b) greater than one (c) zero (d) equal to one

Discussion

43.	Question 18 Unit of electric power may also be expressed as (a) volt ampere (b) kilowatt hour (c) watt second (d) joule second
Answer» Question 18 Unit of electric power may also be expressed as (a) volt ampere (b) kilowatt hour (c) watt second (d) joule second

Discussion

44.	In the given diagram if the arrow shows the direction of current then where will the SOUTH pole be?
Answer» In the given diagram if the arrow shows the direction of current then where will the SOUTH pole be?

44.

In the given diagram if the arrow shows the direction of current then where will the SOUTH pole be?

Answer»

In the given diagram if the arrow shows the direction of current then where will the SOUTH pole be?

Discussion

45.	A radar sends a signal to an aeroplane at a distance 45 km away with a speed of 3 x 108 m/s. The time interval after which the signal will be received back from the Aeroplane is:
Answer» A radar sends a signal to an aeroplane at a distance 45 km away with a speed of 3 x 10⁸ m/s. The time interval after which the signal will be received back from the Aeroplane is:

45.

A radar sends a signal to an aeroplane at a distance 45 km away with a speed of 3 x 108 m/s. The time interval after which the signal will be received back from the Aeroplane is:

Answer»

A radar sends a signal to an aeroplane at a distance 45 km away with a speed of 3 x 10⁸ m/s.

The time interval after which the signal will be received back from the Aeroplane is:

Discussion

46.	A concave mirror produces three times enlarged virtual image of an object placed at 10 cm in front of it. Calculate the radius of curvature of the mirror.
Answer» A concave mirror produces three times enlarged virtual image of an object placed at 10 cm in front of it. Calculate the radius of curvature of the mirror.

Discussion

47.	(a) How can you bend light away from the normal ? (b) How must light travel out of a substance if it is not going to be refracted ?
Answer» (a) How can you bend light away from the normal ? (b) How must light travel out of a substance if it is not going to be refracted ?

Discussion

48.	Infrared radiations are used for
Answer» Infrared radiations are used for

Discussion

49.	Inside a hollow uniform sphere of mass 'M', a uniform rod of lenght 'R√2' is released from the state of rest. The mass of the rod is same as that of the sphere. If the inner radius of the hollow sphere is 'R' then find out horizontal displacement of sphere with respect to earth in the time in which the rod becomes horizontal.
Answer» Inside a hollow uniform sphere of mass 'M', a uniform rod of lenght 'R $\sqrt{2}$ ' is released from the state of rest. The mass of the rod is same as that of the sphere. If the inner radius of the hollow sphere is 'R' then find out horizontal displacement of sphere with respect to earth in the time in which the rod becomes horizontal.

Discussion

50.	In the adjoining figure. a wedge is fixed to an elevator moving upwards with an acceleration a. A block of mass 'm' is placed over the wedge. Find the acceleration of the block with respect to wedge. Neglect friction.
Answer» In the adjoining figure. a wedge is fixed to an elevator moving upwards with an acceleration a. A block of mass 'm' is placed over the wedge. Find the acceleration of the block with respect to wedge. Neglect friction.

50.

In the adjoining figure. a wedge is fixed to an elevator moving upwards with an acceleration a. A block of mass 'm' is placed over the wedge. Find the acceleration of the block with respect to wedge. Neglect friction.

Answer»

In the adjoining figure. a wedge is fixed to an elevator moving upwards with an acceleration a. A block of mass 'm' is placed over the wedge. Find the acceleration of the block with respect to wedge. Neglect friction.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Find the Fahrenheit equivalent for 50∘C.

Which of the following sources of energy are not derived from the sun ? Biomass, wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy

Which characteristic of sound makes it possible to recognize a person by his voice without seeing him?

Which of the following is not a bio mass fuel?

Suppose there is a uniform metre scale floating in space. Let's say I apply a force of 10N at the 10 cm mark in anticlockwise direction and I apply a force of 5N on the 100 cm mark in clockwise direction. Now what will happen to the scale? Plz explain. Thanks

A box of weight 50 kg rests on the surface of a lift. If the lift begins to fall freely under gravity, what is the force with which the box applies force on the surface?

An object is placed 36 cm from a convex lens. A real image is formed 24 cm from the lens. Calculate the focal length of the lens.

Draw the pattern of magnetic field lines of a current carrying solenoid. What does the pattern of field lines inside the solenoid indicate? Write one application of magnetic field of current carrying solenoid. [5 MARKS]

Which among the following are true?

Find the length of AE, given the lengths CD = X m, BH = H m. __

When the light ray is ___________ to the boundary between two medium, light does not bend.

The atmospheric refraction of light causes the twinkling of : (a) planets only (b) stars only (c) planets and stars (d) stars and satellites

When an object is placed at a distance of 36 cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is placed at a distance of : (a) 10 cm from the lens ? (b) 20 cm from the lens ?

What are the various steps which can be taken to control (or reduce) pollution caused by burning fossil fuels?

A current carrying conductor placed in magnetic field experiences a force. The magnitude of force experienced by a current carrying conductor in magnetic field can be increased by:

(a) why do electricians wear rubber hand gloves while working with electricty? (b) what p.d. is needed to send a current of 6 A through an electrical appliance having a resistance of 40Ω ?

Statement I: Fossil fuels are a renewable source of energy. Statement II: Renewable sources are collected from resources which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.

Why the armature as used as a stator?

Write the expression for the heat energy Q received by m kg of a substance of specific heat capacity c J kg−1 K−1 when it is heated through △t ∘C.

What will be the diameter of the image of the moon formed by a spherical concave mirror of focal length 7.6 m?The diameter of the moon is 3450 km and the distance between the earth and the moon is 3.8×105 km.

A resistor has a resistance fo 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?

Electric/electrical Switches are always connected to:

The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5s−1 after 2 hours. The initial count rate was

Prateek travels 25m towards south, then he turns left and travels 30m, and then turns right and travels 15m. How far is he from the starting point?

Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistors and two insulators.

Name the unit used to measure the sound level.

What is the mass of an alpha particle?

Calculate the resistance of 2 km long copper wire of radius 2mm if resistivity of copper = 1.72 × 10 ^ - 8

When 0.2 kg of brass at 100°C is dropped into 0.5 kg of water at 20°C,calculate the specific heat of brass.

Hospitals buy 400-L cylinders of oxygen gas compressed at 150 atm. They administer oxygen to patients at 3.0 atm in a hyperbaric oxygen chamber. What volume of oxygen can a cylinder supply at this pressure?

What is interference of light?

An object of height 2 cm is placed at a distance of 15 CM in front of concave lens of power -100 . Find the size of the image

How did peoples measured light's speed?

What is the formula to calculate the pitch of a screw gauge?

A lens of focal length 12cm forms an erect image three times the size of the object. The distance between the object and the image is A)8cm. B)16cm. C)24cm. D)36cm

State and explain Maxwell's right-hand thumb rule.

A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incidence is: (a) 0∘(b)45∘(c)60∘(d)90∘

Sir/Madam, I am not totally clear with the topic- EMF ? Can you explain theory is simplified way?

In a hydroelectric power plant, waterfalls at a rate of 1000 kg/s from a height of 100 m. Assuming that 50% of the energy of falling water is converted into electrical energy, calculate the power generated per second.(take g=9.8 ms−2)

With the help of a labelled ray-diagram, describe how a plane mirror forms an image of a point source of light placed in front of it. State the characteristics of the image formed in a plane mirror.

Explain clearly why, a person who has lost the sight of one eye is at a disadvantage compared with the normal person who has two good eyes.

Magnification produced by a plane mirror is : (a) less than one (b) greater than one (c) zero (d) equal to one

Question 18 Unit of electric power may also be expressed as (a) volt ampere (b) kilowatt hour (c) watt second (d) joule second

In the given diagram if the arrow shows the direction of current then where will the SOUTH pole be?

A radar sends a signal to an aeroplane at a distance 45 km away with a speed of 3 x 108 m/s. The time interval after which the signal will be received back from the Aeroplane is:

A concave mirror produces three times enlarged virtual image of an object placed at 10 cm in front of it. Calculate the radius of curvature of the mirror.

(a) How can you bend light away from the normal ? (b) How must light travel out of a substance if it is not going to be refracted ?

Infrared radiations are used for

In the adjoining figure. a wedge is fixed to an elevator moving upwards with an acceleration a. A block of mass 'm' is placed over the wedge. Find the acceleration of the block with respect to wedge. Neglect friction.