16569 + Interview Questions in Physics

1.	A student obtained a sharp image of a lighted candle on a screen using a convex lens. Now he wants to focus a distant lamp on a far away electric pole. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen? Justify your answer.
Answer» A student obtained a sharp image of a lighted candle on a screen using a convex lens. Now he wants to focus a distant lamp on a far away electric pole. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen? Justify your answer.

Discussion

2.	What exactly happens in an atomic bomb and how
Answer» What exactly happens in an atomic bomb and how

Discussion

3.	What is solar constant?
Answer» What is solar constant?

Discussion

4.	(a) Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor. (b) Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.
Answer» (a) Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor. (b) Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.

4.

(a) Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor. (b) Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.

Answer»

(a) Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor.

(b) Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.

Discussion

5.	The ideal gas law, which relates the P, V and temperature T of an ideal gas in a closed box, given as PV = nRT, can be manipulated to construct an effective thermometer. A "constant volume gas thermometer” uses a sample of gas (commonly, nitrogen or helium) in a closed chamber, thus fixing the volume V. The temperature is then measured by reading off the corresponding pressure P. At the freezing point of water, it is seen that a gas thermometer records a pressure of 0.9 x 105 Pa; it also records a pressure of 1.2 x 105 Pa at the boiling point of water. What pressure will you find in the gas chamber at a room temperature of 230C?
Answer» The ideal gas law, which relates the P, V and temperature T of an ideal gas in a closed box, given as PV = nRT, can be manipulated to construct an effective thermometer. A "constant volume gas thermometer” uses a sample of gas (commonly, nitrogen or helium) in a closed chamber, thus fixing the volume V. The temperature is then measured by reading off the corresponding pressure P. At the freezing point of water, it is seen that a gas thermometer records a pressure of 0.9 x 10⁵ Pa; it also records a pressure of 1.2 x 10⁵ Pa at the boiling point of water. What pressure will you find in the gas chamber at a room temperature of 23⁰C?

Discussion

6.	It is already known that the sky would have been black and the stars would have been visible all day if there was no atmosphere. But If there was no atmosphere on Earth, would the objects around us still be visible? Why/why not?
Answer» It is already known that the sky would have been black and the stars would have been visible all day if there was no atmosphere. But If there was no atmosphere on Earth, would the objects around us still be visible? Why/why not?

Discussion

7.	Can we say,that Magnetic field lines tells the direction in which Magnetic field is Produced ?
Answer» Can we say,that Magnetic field lines tells the direction in which Magnetic field is Produced ?

Discussion

8.	On a number line, two convex lenses are placed. At origin is the lens 1 with focal length of 30cm and 100 cm on number line is the lens 2 with focal length of 40 cm. An object is placed at the point of 40 cm. Find the positions of any three images.
Answer» On a number line, two convex lenses are placed. At origin is the lens 1 with focal length of 30cm and 100 cm on number line is the lens 2 with focal length of 40 cm. An object is placed at the point of 40 cm. Find the positions of any three images.

Discussion

9.	What are the meaning of gear ratio and velocity ratio?
Answer» What are the meaning of gear ratio and velocity ratio?

Discussion

10.	Which phenomenon is responsible for increasing the apparent length of the day by 4 minutes?
Answer» Which phenomenon is responsible for increasing the apparent length of the day by 4 minutes?

Discussion

11.	A carbon resistor is marked in green, red, and orange bands. The approximate resistance of the resistor is
Answer» A carbon resistor is marked in green, red, and orange bands. The approximate resistance of the resistor is

Discussion

12.	Explain different ways to induce a current in a coil.
Answer» Explain different ways to induce a current in a coil.

Discussion

13.	What is equivalent resistance
Answer» What is equivalent resistance

Discussion

14.	The refractive index of dense flint glass is 1.65 and for alcohol, it is 1.36 with respect to air, then the refractive index of the dense flint glass with respect to alcohol is
Answer» The refractive index of dense flint glass is 1.65 and for alcohol, it is 1.36 with respect to air, then the refractive index of the dense flint glass with respect to alcohol is

Discussion

15.	Which of the following can produce a virtual image?
Answer» Which of the following can produce a virtual image?

Discussion

16.	Thermionic emission from a heated filament varies with its temperature T as
Answer» Thermionic emission from a heated filament varies with its temperature T as

Discussion

17.	If the current through a floodlamp is 5 A, what charge passes in 10 seconds? (a) 0.5 C (b) 2 C (c) 5 C (d) 50 C
Answer» If the current through a floodlamp is 5 A, what charge passes in 10 seconds? (a) 0.5 C (b) 2 C (c) 5 C (d) 50 C

Discussion

18.	Which of the following colour of white light is least deviated by the prism ? (a) green (b) violet (c) indigo (d) yellow
Answer» Which of the following colour of white light is least deviated by the prism ? (a) green (b) violet (c) indigo (d) yellow

Discussion

19.	How does the eye adjust to take account of an increase in brightness ?
Answer» How does the eye adjust to take account of an increase in brightness ?

Discussion

20.	An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains. The cost of electrical energy for 60 hrs if consumed at 2.50 per kWh is:
Answer» An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains. The cost of electrical energy for 60 hrs if consumed at 2.50 per kWh is:

Discussion

21.	How is the magnetic field due to a straight current carrying wire affected if current in the wire is (a) decreased, (b) reversed?
Answer» How is the magnetic field due to a straight current carrying wire affected if current in the wire is (a) decreased, (b) reversed?

Discussion

22.	Question 10 An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.
Answer» Question 10 An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.

Discussion

23.	For an object orbiting earth close to its surface to escape earth's gravitational pull, its orbital velocity has to increase by a factor of
Answer» For an object orbiting earth close to its surface to escape earth's gravitational pull, its orbital velocity has to increase by a factor of

Discussion

24.	In the given fig. θ ABC is an equilateral triangle inscribed in a circle of radius 4 cm and centre O. Show that the area of the shaded region is 43(4π−3√3) cm2. [4 MARKS]
Answer» In the given fig. $θ$ ABC is an equilateral triangle inscribed in a circle of radius 4 cm and centre O. Show that the area of the shaded region is $\frac{4}{3} (4 π - 3 \sqrt{3}) c m^{2}$ . [4 MARKS]

24.

In the given fig. θ ABC is an equilateral triangle inscribed in a circle of radius 4 cm and centre O. Show that the area of the shaded region is 43(4π−3√3) cm2. [4 MARKS]

Answer»

In the given fig. $θ$ ABC is an equilateral triangle inscribed in a circle of radius 4 cm and centre O. Show that the area of the shaded region is $\frac{4}{3} (4 π - 3 \sqrt{3}) c m^{2}$ . [4 MARKS]

Discussion

25.	SI unit of electric current is
Answer» SI unit of electric current is

Discussion

26.	What current must flow in a circular coil of 20 loops of radius 40 cm to produce a magnetic field of 3π * 10-2 T at its centre?
Answer» What current must flow in a circular coil of 20 loops of radius 40 cm to produce a magnetic field of 3π * 10^-2T at its centre?

Discussion

27.	In the Ellingham diagram for oxides, the general trend for the graphs for metal to metal oxide is
Answer» In the Ellingham diagram for oxides, the general trend for the graphs for metal to metal oxide is

Discussion

28.	DC generator has:
Answer» DC generator has:

Discussion

29.	What is red shift theory?
Answer» What is red shift theory?

Discussion

30.	Galvanic cell converts
Answer» Galvanic cell converts

Discussion

31.	A magnetic compass needle is placed on the plane of paper near point A in which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the the deflection of the magnetic compass. When is the deflection maximum?
Answer» A magnetic compass needle is placed on the plane of paper near point A in which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the the deflection of the magnetic compass. When is the deflection maximum?

Discussion

32.	Burrito is a water droplet who resides in the sea. He has heard about the water cycle and wants to roam around the world. But he does not know all the processes and places he should visit. He consulted Fabio, his brother who lives in the clouds but could gather only some information as described below. Help him in his journey around the world by proper justification. [5 MARKS]
Answer» Burrito is a water droplet who resides in the sea. He has heard about the water cycle and wants to roam around the world. But he does not know all the processes and places he should visit. He consulted Fabio, his brother who lives in the clouds but could gather only some information as described below. Help him in his journey around the world by proper justification. [5 MARKS]

32.

Burrito is a water droplet who resides in the sea. He has heard about the water cycle and wants to roam around the world. But he does not know all the processes and places he should visit. He consulted Fabio, his brother who lives in the clouds but could gather only some information as described below. Help him in his journey around the world by proper justification. [5 MARKS]

Answer»

Burrito is a water droplet who resides in the sea. He has heard about the water cycle and wants to roam around the world. But he does not know all the processes and places he should visit. He consulted Fabio, his brother who lives in the clouds but could gather only some information as described below. Help him in his journey around the world by proper justification. [5 MARKS]

Discussion

33.	The main function of ozone in atmosphere is to :
Answer» The main function of ozone in atmosphere is to :

Discussion

34.	Here are some words translated from an artificial language mie pie is blue light mie tie is blue berry aie tie is rasp berry Which words could possibly mean “light fly”?
Answer» Here are some words translated from an artificial language mie pie is blue light mie tie is blue berry aie tie is rasp berry Which words could possibly mean “light fly”?

34.

Here are some words translated from an artificial language mie pie is blue light mie tie is blue berry aie tie is rasp berry Which words could possibly mean “light fly”?

Answer»

Here are some words translated from an artificial language

mie pie is blue light

mie tie is blue berry

aie tie is rasp berry

Which words could possibly mean “light fly”?

Discussion

35.	The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface as shown below, then
Answer» The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface as shown below, then

35.

The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface as shown below, then

Answer»

The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface as shown below, then

Discussion

36.	What is electrichur motor.Write in brief?
Answer» What is electrichur motor.Write in brief?

Discussion

37.	Which of the following given fuels can be considered as the most efficient fuel based on the calorific value?
Answer» Which of the following given fuels can be considered as the most efficient fuel based on the calorific value?

Discussion

38.	Why does an electrical light or a bulb dont last forever thay have a particular lifetime approximately its several years why dont they last longer what is the reason behind this what causes the lifespan of the bulb to decrease?
Answer» Why does an electrical light or a bulb dont last forever thay have a particular lifetime approximately its several years why dont they last longer what is the reason behind this what causes the lifespan of the bulb to decrease?

Discussion

39.	What will be the result if the natural frequency of an influencing body is the same as that of the influenced body?
Answer» What will be the result if the natural frequency of an influencing body is the same as that of the influenced body?

Discussion

40.	Which of the following pairs of angle will be equal in the given figure? Given ∠2 = 30∘.
Answer» Which of the following pairs of angle will be equal in the given figure? Given $∠$ 2 = $30^{\circ}$ .

40.

Which of the following pairs of angle will be equal in the given figure? Given ∠2 = 30∘.

Answer»

Which of the following pairs of angle will be equal in the given figure? Given $∠$ 2 = $30^{\circ}$ .

Discussion

41.	Question 2 (c) In Activity 13.7, how do we think the displacement of rod AB will be affected if (iii) length of the rod AB is increased?
Answer» Question 2 (c) In Activity 13.7, how do we think the displacement of rod AB will be affected if (iii) length of the rod AB is increased?

Discussion

42.	For a screw gauge, how are the pitch and least count related?
Answer» For a screw gauge, how are the pitch and least count related?

Discussion

43.	Explain the working of centrifugal instrument in detail with respect to physics
Answer» Explain the working of centrifugal instrument in detail with respect to physics

Discussion

44.	The near point of a human eye is at a distance of
Answer» The near point of a human eye is at a distance of

Discussion

45.	Where do the manufacturers use a magnetic strip in the refrigerator? Why is this magnetic strip used?
Answer» Where do the manufacturers use a magnetic strip in the refrigerator? Why is this magnetic strip used?

Discussion

46.	DC motor works on the principle of ___ on a current carrying conductor due to magnetic field.
Answer» DC motor works on the principle of ___ on a current carrying conductor due to magnetic field.

Discussion

47.	A student claims that because of atmospheric refraction, the sun can be seen after it has set, and the day is, therefore, longer than if the earth had no atmosphere. (a) What does the student mean by saying that the sun can be seen after it has set ? (b) Do you think that the student's conclusion is correct ?
Answer» A student claims that because of atmospheric refraction, the sun can be seen after it has set, and the day is, therefore, longer than if the earth had no atmosphere. (a) What does the student mean by saying that the sun can be seen after it has set ? (b) Do you think that the student's conclusion is correct ?

Discussion

48.	Q19. Consider the following statements about Tiangong-1: 1. Tiangong-1 (Heavenly Palace or Celestial Palace-1) was China’s first prototype space station or space laboratory 2. It was placed in orbit as part of China’s efforts towards building its own space station. Which of the statements are correct?
Answer» Q19. Consider the following statements about Tiangong-1: 1. Tiangong-1 (Heavenly Palace or Celestial Palace-1) was China’s first prototype space station or space laboratory 2. It was placed in orbit as part of China’s efforts towards building its own space station. Which of the statements are correct?

48.

Q19. Consider the following statements about Tiangong-1: 1. Tiangong-1 (Heavenly Palace or Celestial Palace-1) was China’s first prototype space station or space laboratory 2. It was placed in orbit as part of China’s efforts towards building its own space station. Which of the statements are correct?

Answer»

Q19. Consider the following statements about Tiangong-1:

1. Tiangong-1 (Heavenly Palace or Celestial Palace-1) was China’s first prototype space station or space laboratory

2. It was placed in orbit as part of China’s efforts towards building its own space station.

Which of the statements are correct?

Discussion

49.	What is the : (a) far point of a normal human eye ? (b) near point of a normal human eye ?
Answer» What is the : (a) far point of a normal human eye ? (b) near point of a normal human eye ?

Discussion

50.	Question 5 A large truck and a car, both moving with a velocity of magnitude v, have a head-on collision and both of them come to a halt after that. If the collision lasts for 1 s: (a) Which vehicle experiences the greater force of impact? (b) Which vehicle experiences the greater change in momentum? (c) Which vehicle experiences the greater acceleration? (d) Why is the car likely to suffer more damage than the truck?
Answer» Question 5 A large truck and a car, both moving with a velocity of magnitude v, have a head-on collision and both of them come to a halt after that. If the collision lasts for 1 s: (a) Which vehicle experiences the greater force of impact? (b) Which vehicle experiences the greater change in momentum? (c) Which vehicle experiences the greater acceleration? (d) Why is the car likely to suffer more damage than the truck?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A student obtained a sharp image of a lighted candle on a screen using a convex lens. Now he wants to focus a distant lamp on a far away electric pole. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen? Justify your answer.

What exactly happens in an atomic bomb and how

What is solar constant?

(a) Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor. (b) Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.

It is already known that the sky would have been black and the stars would have been visible all day if there was no atmosphere. But If there was no atmosphere on Earth, would the objects around us still be visible? Why/why not?

Can we say,that Magnetic field lines tells the direction in which Magnetic field is Produced ?

On a number line, two convex lenses are placed. At origin is the lens 1 with focal length of 30cm and 100 cm on number line is the lens 2 with focal length of 40 cm. An object is placed at the point of 40 cm. Find the positions of any three images.

What are the meaning of gear ratio and velocity ratio?

Which phenomenon is responsible for increasing the apparent length of the day by 4 minutes?

A carbon resistor is marked in green, red, and orange bands. The approximate resistance of the resistor is

Explain different ways to induce a current in a coil.

What is equivalent resistance

The refractive index of dense flint glass is 1.65 and for alcohol, it is 1.36 with respect to air, then the refractive index of the dense flint glass with respect to alcohol is

Which of the following can produce a virtual image?

Thermionic emission from a heated filament varies with its temperature T as

If the current through a floodlamp is 5 A, what charge passes in 10 seconds? (a) 0.5 C (b) 2 C (c) 5 C (d) 50 C

Which of the following colour of white light is least deviated by the prism ? (a) green (b) violet (c) indigo (d) yellow

How does the eye adjust to take account of an increase in brightness ?

An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains. The cost of electrical energy for 60 hrs if consumed at 2.50 per kWh is:

How is the magnetic field due to a straight current carrying wire affected if current in the wire is (a) decreased, (b) reversed?

Question 10 An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.

For an object orbiting earth close to its surface to escape earth's gravitational pull, its orbital velocity has to increase by a factor of

In the given fig. θ ABC is an equilateral triangle inscribed in a circle of radius 4 cm and centre O. Show that the area of the shaded region is 43(4π−3√3) cm2. [4 MARKS]

SI unit of electric current is

What current must flow in a circular coil of 20 loops of radius 40 cm to produce a magnetic field of 3π * 10-2 T at its centre?

In the Ellingham diagram for oxides, the general trend for the graphs for metal to metal oxide is

DC generator has:

What is red shift theory?

Galvanic cell converts

A magnetic compass needle is placed on the plane of paper near point A in which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the the deflection of the magnetic compass. When is the deflection maximum? ​​​​

The main function of ozone in atmosphere is to :

Here are some words translated from an artificial language mie pie is blue light mie tie is blue berry aie tie is rasp berry Which words could possibly mean “light fly”?

The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface as shown below, then

What is electrichur motor.Write in brief?

Which of the following given fuels can be considered as the most efficient fuel based on the calorific value?

Why does an electrical light or a bulb dont last forever thay have a particular lifetime approximately its several years why dont they last longer what is the reason behind this what causes the lifespan of the bulb to decrease?

What will be the result if the natural frequency of an influencing body is the same as that of the influenced body?

Which of the following pairs of angle will be equal in the given figure? Given ∠2 = 30∘.

Question 2 (c) In Activity 13.7, how do we think the displacement of rod AB will be affected if (iii) length of the rod AB is increased?

For a screw gauge, how are the pitch and least count related?

Explain the working of centrifugal instrument in detail with respect to physics

The near point of a human eye is at a distance of

Where do the manufacturers use a magnetic strip in the refrigerator? Why is this magnetic strip used?

DC motor works on the principle of ___ on a current carrying conductor due to magnetic field.

What is the : (a) far point of a normal human eye ? (b) near point of a normal human eye ?

A magnetic compass needle is placed on the plane of paper near point A in which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the the deflection of the magnetic compass. When is the deflection maximum?