16569 + Interview Questions in Physics

1.	Please can I get a video on generators and ac and dc current?
Answer» Please can I get a video on generators and ac and dc current?

Discussion

2.	What is electomotive force or emf of a cell?
Answer» What is electomotive force or emf of a cell?

Discussion

3.	Directions:- The following item consist of two statements, one labelled as ‘Assertion A’ and the other labelled as ‘Reason R’. You are to examine these two statements carefully and decide if the Assertion A and the Reason R are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly. Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling. Reason (R): If no external force acts on a system, its momentum cannot change.
Answer» Directions:- The following item consist of two statements, one labelled as ‘Assertion A’ and the other labelled as ‘Reason R’. You are to examine these two statements carefully and decide if the Assertion A and the Reason R are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly. Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling. Reason (R): If no external force acts on a system, its momentum cannot change.

3.

Directions:- The following item consist of two statements, one labelled as ‘Assertion A’ and the other labelled as ‘Reason R’. You are to examine these two statements carefully and decide if the Assertion A and the Reason R are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly. Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling. Reason (R): If no external force acts on a system, its momentum cannot change.

Answer»

Directions:- The following item consist of two statements, one labelled as ‘Assertion A’ and the other labelled as ‘Reason R’. You are to examine these two statements carefully and decide if the Assertion A and the Reason R are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly.

Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling.

Reason (R): If no external force acts on a system, its momentum cannot change.

Discussion

4.	Ammeter burns out whenever it is connected in the parallel to the circuit why?
Answer» Ammeter burns out whenever it is connected in the parallel to the circuit why?

Discussion

5.	An object is place at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. find the position of the image.
Answer» An object is place at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. find the position of the image.

Discussion

6.	Tuning fork F1 has a frequency of 256 Hz and it is observed to produce 6 beats/second with another tuning fork F2. When F2 is loaded with wax, it still produces 6 beats/second with F1. The frequency of F2 before loading was [MP PET 1990]
Answer» Tuning fork $F_{1}$ has a frequency of 256 Hz and it is observed to produce 6 beats/second with another tuning fork $F_{2}$ . When $F_{2}$ is loaded with wax, it still produces 6 beats/second with $F_{1}$ . The frequency of $F_{2}$ before loading was [MP PET 1990]

6.

Tuning fork F1 has a frequency of 256 Hz and it is observed to produce 6 beats/second with another tuning fork F2. When F2 is loaded with wax, it still produces 6 beats/second with F1. The frequency of F2 before loading was [MP PET 1990]

Answer»

Tuning fork $F_{1}$ has a frequency of 256 Hz and it is observed to produce 6

beats/second with another tuning fork $F_{2}$ . When $F_{2}$ is loaded with wax, it

still produces 6 beats/second with $F_{1}$ . The frequency of $F_{2}$ before loading

was

[MP PET 1990]

Discussion

7.	A 200 kg motorcycle is driven around a 14 m radius horizontal circular loop at a constant speed of 15 m/s. Calculate the required centripetal force on the motorcycle.
Answer» A $200 k g$ motorcycle is driven around a $14 m$ radius horizontal circular loop at a constant speed of $15 m / s$ . Calculate the required centripetal force on the motorcycle.

Discussion

8.	When a 0.5 kW heater operates for 20 minutes, what is the electrical energy consumed (in kJ)?
Answer» When a 0.5 kW heater operates for 20 minutes, what is the electrical energy consumed (in kJ)?

Discussion

9.	___ is an example of a liquid which is a good conductor of heat.
Answer» ___ is an example of a liquid which is a good conductor of heat.

Discussion

10.	A wire is folded over itself so that its length is halved. What will happen to its resistance?
Answer» A wire is folded over itself so that its length is halved. What will happen to its resistance?

Discussion

11.	If the radius of curvature (R) of a convex mirror is 30 cm. What is its focal length?
Answer» If the radius of curvature $(R)$ of a convex mirror is $30 c m$ . What is its focal length?

Discussion

12.	Which of the following radiation has the shortest wavelength.
Answer» Which of the following radiation has the shortest wavelength.

Discussion

13.	State the type of mirror preferred as (i) rear view mirror in vehicles, (ii) shaving mirror. Justify your answer giving two reasons in each case.
Answer» State the type of mirror preferred as (i) rear view mirror in vehicles, (ii) shaving mirror. Justify your answer giving two reasons in each case.

Discussion

14.	The energy required for an appliance to run is 100 J s−1. What is the power consumed by it in W, if it operates at 220 V?
Answer» The energy required for an appliance to run is $100 {J s}^{- 1}$ . What is the power consumed by it in $W$ , if it operates at $220 V$ ?

Discussion

15.	With what speed must an object be thrown vertically upwards to reach a height of 91.5 m? (Take a=9.8 ms−2)
Answer» With what speed must an object be thrown vertically upwards to reach a height of 91.5 m? (Take $a = 9.8 m s^{- 2}$ )

Discussion

16.	Temperature difference required between the water at the surface and water at depths up to 2 km to operate ocean thermal conservation plants is
Answer» Temperature difference required between the water at the surface and water at depths up to 2 km to operate ocean thermal conservation plants is

Discussion

17.	Major pollutants produced during combustion of fossil fuels are
Answer» Major pollutants produced during combustion of fossil fuels are

Discussion

18.	Which of the following has high melting point?
Answer» Which of the following has high melting point?

Discussion

19.	Force of gravity is least at the_______.
Answer» Force of gravity is least at the_______.

Discussion

20.	Calculate the Q-value in the following decay: 19 8O→19 9F+e−+¯v. These may look like long calculations; use the unit amu or u for the masses, and c2=931MeVu, and it will become much simpler. Atomic masses:19 8O:19.003576 u; 19 9F:18.998403 u.
Answer» Calculate the Q-value in the following decay: $_{8}^{19} O \to_{9}^{19} F + e^{-} + ¯ v .$ These may look like long calculations; use the unit amu or u for the masses, and $c^{2} = 931 \frac{M e V}{u},$ and it will become much simpler. $A t o m i c m a s s e s :_{8}^{19} O : 19.003576 u;_{9}^{19} F : 18.998403 u .$

Discussion

21.	Which colour of white light travels (a) fastest (b) slowest, in glass ?
Answer» Which colour of white light travels (a) fastest (b) slowest, in glass ?

Discussion

22.	(a) A switch is not touched with wet hands while putting it on or off. Give a reason for your answer. (b) Name the wire to which a switch is connected.
Answer» (a) A switch is not touched with wet hands while putting it on or off. Give a reason for your answer. (b) Name the wire to which a switch is connected.

22.

(a) A switch is not touched with wet hands while putting it on or off. Give a reason for your answer. (b) Name the wire to which a switch is connected.

Answer»

(a) A switch is not touched with wet hands while putting it on or off. Give a reason for your answer.

(b) Name the wire to which a switch is connected.

Discussion

23.	A ray of light going towards the focus of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation.
Answer» A ray of light going towards the focus of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation.

Discussion

24.	In the following diagram, the rod is in equilibrium. Then,
Answer» In the following diagram, the rod is in equilibrium. Then,

24.

In the following diagram, the rod is in equilibrium. Then,

Answer»

In the following diagram, the rod is in equilibrium. Then,

Discussion

25.	The velocity of a freely falling body, starting at rest and after one second is ___ m/s. (Round your answer to the nearest integer)
Answer» The velocity of a freely falling body, starting at rest and after one second is ___ m/s. (Round your answer to the nearest integer)

Discussion

26.	(a) What do the letters p.d. stand for? (b) Which device is used to measure p.d?
Answer» (a) What do the letters p.d. stand for? (b) Which device is used to measure p.d?

Discussion

27.	The solar constant is equivalent to___ in 12 hours of time.
Answer» The solar constant is equivalent to___ in 12 hours of time.

Discussion

28.	In a Xerox machine the black ink’s toner particles are negatively charged which strongly sticks to the white charged A4 sheet paper and forms letters and images. What charge should the A4 sheet possess for this process to happen.
Answer» In a Xerox machine the black ink’s toner particles are negatively charged which strongly sticks to the white charged A4 sheet paper and forms letters and images. What charge should the A4 sheet possess for this process to happen.

Discussion

29.	Which element is used in the manufacturing of solar cells?
Answer» Which element is used in the manufacturing of solar cells?

Discussion

30.	Which among the words is commonly used with the given word? _____ tuned
Answer» Which among the words is commonly used with the given word? _____ tuned

Discussion

31.	Why do swimming pool appears shallow than its actually is? What phenomenon is responsible for it?
Answer» Why do swimming pool appears shallow than its actually is? What phenomenon is responsible for it?

Discussion

32.	If AB is an object and A'B' is an image formed, then match the following.
Answer» If AB is an object and A'B' is an image formed, then match the following.

32.

If AB is an object and A'B' is an image formed, then match the following.

Answer»

If AB is an object and A'B' is an image formed, then match the following.

Discussion

33.	What happens when a beam of sunlight enters a dusty room through a window ? Explain your answer.
Answer» What happens when a beam of sunlight enters a dusty room through a window ? Explain your answer.

Discussion

34.	For the object placed between the optical centre and focus of a convex lens, the image formed is:
Answer» For the object placed between the optical centre and focus of a convex lens, the image formed is:

Discussion

35.	A concave length have focal length 15cm. At what distance the object should be placed so it forms an image of 10cm from lens and find magnification
Answer» A concave length have focal length 15cm. At what distance the object should be placed so it forms an image of 10cm from lens and find magnification

Discussion

36.	State two advantages and two limitations of using wind energy for generating electricity.
Answer» State two advantages and two limitations of using wind energy for generating electricity.

Discussion

37.	The near point of a hypermetropic eye is 1 metre. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
Answer» The near point of a hypermetropic eye is 1 metre. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

Discussion

38.	Two lithium nuclei at room temperature do not combine to form a carbon nucleus, because:
Answer» Two lithium nuclei at room temperature do not combine to form a carbon nucleus, because:

Discussion

39.	A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to:
Answer» A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to:

Discussion

40.	A rectangular coil ABCD of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
Answer» A rectangular coil ABCD of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

Discussion

41.	The displacement-distance graph for a particle in a wave is shown below. If 2λ + R=3A then find the value of R. λ= wavelength of wave, A = amplitude of wave
Answer» The displacement-distance graph for a particle in a wave is shown below. If $2 λ + R = 3 A$ then find the value of R. $λ$ = wavelength of wave, A = amplitude of wave

41.

The displacement-distance graph for a particle in a wave is shown below. If 2λ + R=3A then find the value of R. λ= wavelength of wave, A = amplitude of wave

Answer»

The displacement-distance graph for a particle in a wave is shown below.
If $2 λ + R = 3 A$ then find the value of R.
$λ$ = wavelength of wave,
A = amplitude of wave

Discussion

42.	The current i in the circuit is:
Answer» The current i in the circuit is:

Discussion

43.	Question 2 A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.
Answer» Question 2 A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.

Discussion

44.	Question 9 Which part of the solar cooker is responsible for green house effect?
Answer» Question 9 Which part of the solar cooker is responsible for green house effect?

Discussion

45.	What is the effect of excessive use of plastic?
Answer» What is the effect of excessive use of plastic?

Discussion

46.	How does density of the medium affect the speed of light?
Answer» How does density of the medium affect the speed of light?

Discussion

47.	A pressure cooker is based on the principle that boiling water increases with the_______.
Answer» A pressure cooker is based on the principle that boiling water increases with the_______.

Discussion

48.	Which safety device is used in a screw gauge? What is its function?
Answer» Which safety device is used in a screw gauge? What is its function?

Discussion

49.	You are given 'n' number of 100ohm resistors but apparently you don't need 100ohm resistors. You need one 10Ω resistor. How many of these 'n' resistors will you use to make one 10 ohm resistor?
Answer» You are given 'n' number of 100ohm resistors but apparently you don't need 100ohm resistors. You need one $10 Ω$ resistor. How many of these 'n' resistors will you use to make one 10 ohm resistor?

Discussion

50.	Do every acid conduct electricity? If no , then give some examples.
Answer» Do every acid conduct electricity? If no , then give some examples.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Please can I get a video on generators and ac and dc current?

What is electomotive force or emf of a cell?

Ammeter burns out whenever it is connected in the parallel to the circuit why?

An object is place at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. find the position of the image.

Tuning fork F1 has a frequency of 256 Hz and it is observed to produce 6 beats/second with another tuning fork F2. When F2 is loaded with wax, it still produces 6 beats/second with F1. The frequency of F2 before loading was [MP PET 1990]

A 200 kg motorcycle is driven around a 14 m radius horizontal circular loop at a constant speed of 15 m/s. Calculate the required centripetal force on the motorcycle.

When a 0.5 kW heater operates for 20 minutes, what is the electrical energy consumed (in kJ)?

___ is an example of a liquid which is a good conductor of heat.

A wire is folded over itself so that its length is halved. What will happen to its resistance?

If the radius of curvature (R) of a convex mirror is 30 cm. What is its focal length?

Which of the following radiation has the shortest wavelength.

State the type of mirror preferred as (i) rear view mirror in vehicles, (ii) shaving mirror. Justify your answer giving two reasons in each case.

The energy required for an appliance to run is 100 J s−1. What is the power consumed by it in W, if it operates at 220 V?

With what speed must an object be thrown vertically upwards to reach a height of 91.5 m? (Take a=9.8 ms−2)

Temperature difference required between the water at the surface and water at depths up to 2 km to operate ocean thermal conservation plants is

Major pollutants produced during combustion of fossil fuels are

Which of the following has high melting point?

Force of gravity is least at the_______.

Calculate the Q-value in the following decay: 19 8O→19 9F+e−+¯v. These may look like long calculations; use the unit amu or u for the masses, and c2=931MeVu, and it will become much simpler. Atomic masses:19 8O:19.003576 u; 19 9F:18.998403 u.

Which colour of white light travels (a) fastest (b) slowest, in glass ?

(a) A switch is not touched with wet hands while putting it on or off. Give a reason for your answer. (b) Name the wire to which a switch is connected.

A ray of light going towards the focus of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation.

In the following diagram, the rod is in equilibrium. Then,

The velocity of a freely falling body, starting at rest and after one second is ___ m/s. (Round your answer to the nearest integer)

(a) What do the letters p.d. stand for? (b) Which device is used to measure p.d?

The solar constant is equivalent to___ in 12 hours of time.

In a Xerox machine the black ink’s toner particles are negatively charged which strongly sticks to the white charged A4 sheet paper and forms letters and images. What charge should the A4 sheet possess for this process to happen.

Which element is used in the manufacturing of solar cells?

Which among the words is commonly used with the given word? _____ tuned

Why do swimming pool appears shallow than its actually is? What phenomenon is responsible for it?

If AB is an object and A'B' is an image formed, then match the following.

What happens when a beam of sunlight enters a dusty room through a window ? Explain your answer.

For the object placed between the optical centre and focus of a convex lens, the image formed is:

A concave length have focal length 15cm. At what distance the object should be placed so it forms an image of 10cm from lens and find magnification

State two advantages and two limitations of using wind energy for generating electricity.

The near point of a hypermetropic eye is 1 metre. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

Two lithium nuclei at room temperature do not combine to form a carbon nucleus, because:

A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to:

A rectangular coil ABCD of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

The displacement-distance graph for a particle in a wave is shown below. If 2λ + R=3A then find the value of R. λ= wavelength of wave, A = amplitude of wave

The current i in the circuit is:

Question 2 A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.

Question 9 Which part of the solar cooker is responsible for green house effect?

What is the effect of excessive use of plastic?

How does density of the medium affect the speed of light?

A pressure cooker is based on the principle that boiling water increases with the_______.

Which safety device is used in a screw gauge? What is its function?

You are given 'n' number of 100ohm resistors but apparently you don't need 100ohm resistors. You need one 10Ω resistor. How many of these 'n' resistors will you use to make one 10 ohm resistor?

Do every acid conduct electricity? If no , then give some examples.