16569 + Interview Questions in Physics

1.	An inductor of inductance L is decayed through a resistance R . The average life of a radioactive substances is T. Find R for which electrical energy stored in inductor to the activity of the sample is a constant.
Answer» An inductor of inductance L is decayed through a resistance R . The average life of a radioactive substances is T. Find R for which electrical energy stored in inductor to the activity of the sample is a constant.

Discussion

2.	what is the effective focal length when one surface of of a double convex lens has been silvered
Answer» what is the effective focal length when one surface of of a double convex lens has been silvered

Discussion

3.	Answer the following questions briefly (a) What is the poetic device used when the mirror says 'I swallow'? (b) How does the mirror usually pass its time? (c) What disturbs the mirror's contemplation of the opposite wall? (d) Why does the mirror appear to be a lake in the second stanza? What aspect of the mirror do you think is being referred to here? (e) What is the woman searching for in the depths of the lake? (f) How does the narrator convey the fact that the woman looking at her reflection in the lake is deeply distressed? (g) What makes the woman start crying? (h) What do you think the 'terrible fish' in the last line symbolizes? What is the poetic device used here?
Answer» Answer the following questions briefly (a) What is the poetic device used when the mirror says 'I swallow'? (b) How does the mirror usually pass its time? (c) What disturbs the mirror's contemplation of the opposite wall? (d) Why does the mirror appear to be a lake in the second stanza? What aspect of the mirror do you think is being referred to here? (e) What is the woman searching for in the depths of the lake? (f) How does the narrator convey the fact that the woman looking at her reflection in the lake is deeply distressed? (g) What makes the woman start crying? (h) What do you think the 'terrible fish' in the last line symbolizes? What is the poetic device used here?

3.

Answer the following questions briefly (a) What is the poetic device used when the mirror says 'I swallow'? (b) How does the mirror usually pass its time? (c) What disturbs the mirror's contemplation of the opposite wall? (d) Why does the mirror appear to be a lake in the second stanza? What aspect of the mirror do you think is being referred to here? (e) What is the woman searching for in the depths of the lake? (f) How does the narrator convey the fact that the woman looking at her reflection in the lake is deeply distressed? (g) What makes the woman start crying? (h) What do you think the 'terrible fish' in the last line symbolizes? What is the poetic device used here?

Answer»

Answer
the following questions briefly

(a)
What
is the poetic device used when the mirror says 'I
swallow'?

(b)
How
does the mirror usually pass its time?

(c)
What
disturbs the mirror's contemplation of the opposite wall?

(d)
Why
does the mirror appear to be a lake in the second stanza? What aspect
of the mirror do you think is being referred to here?

(e)
What
is the woman searching for in the depths of the lake?

(f)
How
does the narrator convey the fact that the woman looking at her
reflection in the lake is deeply distressed?

(g)
What
makes the woman start crying?

(h)
What
do you think the 'terrible
fish' in
the last line symbolizes? What is the poetic device used here?

Discussion

4.	ntangular speed of a wheel increases from 60rpm to 240rpm and in this duration wheel completes 4 revolutions .n ntfind angular acceleration and timen
Answer» ntangular speed of a wheel increases from 60rpm to 240rpm and in this duration wheel completes 4 revolutions .n ntfind angular acceleration and timen

Discussion

5.	Why does resistance become zero at critical temperature as in case of a super conductor?
Answer» Why does resistance become zero at critical temperature as in case of a super conductor?

Discussion

6.	an object and a concave mirror of focal length 20 cm approach each other with a speed of 1 cm/s and 2 cm/s respectively. at the instant when the object is at a distance of 15 cm from the mirror the speed of image isa:50 cm/sb:18 cm/s
Answer» an object and a concave mirror of focal length 20 cm approach each other with a speed of 1 cm/s and 2 cm/s respectively. at the instant when the object is at a distance of 15 cm from the mirror the speed of image is a:50 cm/s b:18 cm/s

Discussion

7.	Curvature of a spherical mirror??
Answer» Curvature of a spherical mirror??

Discussion

8.	light waves travel with the speed of 3*10^8 m/s.Express the speed in miles per hour.
Answer» light waves travel with the speed of 3*10^8 m/s.Express the speed in miles per hour.

Discussion

9.	The mass of the body on moon is 40 kg. What wii be the weight of the same body on the earth?
Answer» The mass of the body on moon is $40 k g$ . What wii be the weight of the same body on the earth?

Discussion

10.	Which force is responsible for the flow of charge through the circuit
Answer» Which force is responsible for the flow of charge through the circuit

Discussion

11.	What effect does a convex lens have on parallel rays of light incident on it? In what way is the effect of a concave lens different?
Answer» What effect does a convex lens have on parallel rays of light incident on it? In what way is the effect of a concave lens different?

Discussion

12.	The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have:(a) Maximum potential energy?(b) Maximum kinetic energy?Give reason for your answer.
Answer» The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have: (a) Maximum potential energy? (b) Maximum kinetic energy? Give reason for your answer.

Discussion

13.	Cream from the milk is seperated by centrifugal method because:
Answer» Cream from the milk is seperated by centrifugal method because:

Discussion

14.	A disc of mass m and radius R is rolling without slipping on a horizontal, fixed rough surface with translational velocity v as shown in the figure. Here, →LO and →LP represent the angular momentum about point O and P respectively. Which of the following is/are true?
Answer» A disc of mass $m$ and radius $R$ is rolling without slipping on a horizontal, fixed rough surface with translational velocity $v$ as shown in the figure. Here, ${\to L}_{O} and {\to L}_{P}$ represent the angular momentum about point $O$ and $P$ respectively. Which of the following is/are true?

Discussion

15.	144.A plano-convex lens, when silvered at its plane surface is equivalent to a concave mirror of focal length 28 cm. When its curved surface is silvered and the plane surface not silvered, it is equivalent to a concave mirror of focal length 10 cm, then the refractive index of the material of the lens is
Answer» 144.A plano-convex lens, when silvered at its plane surface is equivalent to a concave mirror of focal length 28 cm. When its curved surface is silvered and the plane surface not silvered, it is equivalent to a concave mirror of focal length 10 cm, then the refractive index of the material of the lens is

Discussion

16.	A rectangular coil (Dimension 5 cm×2.5 cm) with 100 turns, carrying a current of 3 A in the clock-wise direction, is kept centered at the origin and in the X-Z plane. A magnetic field of 1 T is applied along X-axis. If the coil is tilted through 45∘ about Z-axis, then the torque on the coil is
Answer» A rectangular coil (Dimension $5 cm \times 2.5 cm$ ) with $100$ turns, carrying a current of $3 A$ in the clock-wise direction, is kept centered at the origin and in the X-Z plane. A magnetic field of $1 T$ is applied along X-axis. If the coil is tilted through $45^{\circ}$ about Z-axis, then the torque on the coil is

Discussion

17.	Definition for magnetic field & field line.
Answer» Definition for magnetic field & field line.

Discussion

18.	Angle of minimum deviation is equal to the angle of prism A of an equilateral glass prism. The angle of incidence at which minimum deviation will be obtained is
Answer» Angle of minimum deviation is equal to the angle of prism A of an equilateral glass prism. The angle of incidence at which minimum deviation will be obtained is

Discussion

19.	Twelve resistors each of resistance 18 Ω are connected in a circuit as shown. The net resistance between AB is
Answer» Twelve resistors each of resistance $18 Ω$ are connected in a circuit as shown. The net resistance between $AB$ is

Discussion

20.	For the effective working of wind mills, the minimum wind speed required is
Answer» For the effective working of wind mills, the minimum wind speed required is

Discussion

21.	what are reagents and substrat
Answer» what are reagents and substrat

Discussion

22.	Sin^2wt- cos^2wt is shm or periodic motion
Answer» Sin^2wt- cos^2wt is shm or periodic motion

Discussion

23.	The swimming pool appears to be less deep than it actually is. Which phenomenon is responsible for it?
Answer» The swimming pool appears to be less deep than it actually is. Which phenomenon is responsible for it?

Discussion

24.	Happens to the eye when you enter a dark cinema hall from bright sunshine? Give reasons for your answer.
Answer» Happens to the eye when you enter a dark cinema hall from bright sunshine? Give reasons for your answer.

Discussion

25.	Consider the following processes: 1. Wind rotates the blades of the windmill 2. Electrical energy produced 3. Turbine rotates 4. Blowing of wind Which of the following predicts the correct order of events?
Answer» Consider the following processes: 1. Wind rotates the blades of the windmill 2. Electrical energy produced 3. Turbine rotates 4. Blowing of wind Which of the following predicts the correct order of events?

Discussion

26.	what is difference between potensial and potensial difference
Answer» what is difference between potensial and potensial difference

Discussion

27.	Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens, when an object is placed beyond 2F.
Answer» Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens, when an object is placed beyond 2F.

Discussion

28.	Akshit knows that water in rivers, ponds and oceans is in liquid state but he is not sure about where he can get other forms of water viz. ice and water vapour. Can you tell him about different sources where he can get other forms of water ? [3 MARKS]
Answer» Akshit knows that water in rivers, ponds and oceans is in liquid state but he is not sure about where he can get other forms of water viz. ice and water vapour. Can you tell him about different sources where he can get other forms of water ? [3 MARKS]

Discussion

29.	Can visible light be scattered by atoms/ molecules in earth's atmosphere?
Answer» Can visible light be scattered by atoms/ molecules in earth's atmosphere?

Discussion

30.	Name three factors that affect climate. [3 MARKS]
Answer» Name three factors that affect climate. [3 MARKS]

Discussion

31.	how does light wave travel
Answer» how does light wave travel

Discussion

32.	Which of the following represent a circuit diagram for the given circuit?Where green color shows the switch is ON and the red color indicates the switch is OFF.
Answer» Which of the following represent a circuit diagram for the given circuit? Where green color shows the switch is ON and the red color indicates the switch is OFF.

Discussion

33.	If a tunning fork is vibrating freely, then its vibration will be:
Answer» If a tunning fork is vibrating freely, then its vibration will be:

Discussion

34.	When a body vibrates under a periodic force, the vibrations of the body are :
Answer» When a body vibrates under a periodic force, the vibrations of the body are :

Discussion

35.	Choose the position of object, kept before a lens to form image of same size as that of the object.
Answer» Choose the position of object, kept before a lens to form image of same size as that of the object.

Discussion

36.	A large spherical mass M is fixed at one position and two identical point masses m are kept on a line passing through the centre of M. The point masses are connected by a rigid massless rod of length l and this assembly is free to move along the line connecting them. All three masses interact only through their mutual gravitational interaction. When the point mass nearer to M is at a distance r=3l from M, the tension in the rod is zero for m=k(M288). The value of k is
Answer» A large spherical mass $M$ is fixed at one position and two identical point masses $m$ are kept on a line passing through the centre of $M$ . The point masses are connected by a rigid massless rod of length $l$ and this assembly is free to move along the line connecting them. All three masses interact only through their mutual gravitational interaction. When the point mass nearer to $M$ is at a distance $r = 3 l$ from $M$ , the tension in the rod is zero for $m = k (\frac{M}{288})$ . The value of $k$ is

Discussion

37.	Answer the following questions in your own words.(a) What is meant by scattering of light ?(b) Does the shadow really vanish in the zero shadow condition?(c) Will the laser beam be seen if it passes through a glass box which contains a lighted incense stick?
Answer» Answer the following questions in your own words. (a) What is meant by scattering of light ? (b) Does the shadow really vanish in the zero shadow condition? (c) Will the laser beam be seen if it passes through a glass box which contains a lighted incense stick?

Discussion

38.	Question 12Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
Answer» Question 12 Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Discussion

39.	The number of electrons must be removed from a conductor, so that it acquires a charge of 4.8nC
Answer» The number of electrons must be removed from a conductor, so that it acquires a charge of 4.8nC

Discussion

40.	A plane mirror and an object approach each other with speeds of 5m/s and 10 m/s respectively. The speed of the image will be __.
Answer» A plane mirror and an object approach each other with speeds of 5m/s and 10 m/s respectively. The speed of the image will be __.

Discussion

41.	The force which is compulsory to sustain uniform circular motion is
Answer» The force which is compulsory to sustain uniform circular motion is

Discussion

42.	A radar is able to detect the reflected waves from an enemy aeroplane, after a time interval of 0.02 milliseconds. If the velocity of the wave is 3 x 108 m s-1, the distance of the plane from the radar station is:
Answer» A radar is able to detect the reflected waves from an enemy aeroplane, after a time interval of 0.02 milliseconds. If the velocity of the wave is 3 x 10⁸ m s^-1, the distance of the plane from the radar station is:

42.

A radar is able to detect the reflected waves from an enemy aeroplane, after a time interval of 0.02 milliseconds. If the velocity of the wave is 3 x 108 m s-1, the distance of the plane from the radar station is:

Answer»

A radar is able to detect the reflected waves from an enemy aeroplane, after a time interval of 0.02 milliseconds.

If the velocity of the wave is 3 x 10⁸ m s^-1, the distance of the plane from the radar station is:

Discussion

43.	A ,B,C are three filters. A transmits red, orange, yellow and green light. B transmits green and blue light and C transmits yellow light. Describe the nature of the light transmitted through: 1. A and C 2. A and B 3. B and C 4. A, B and C
Answer» A ,B,C are three filters. A transmits red, orange, yellow and green light. B transmits green and blue light and C transmits yellow light. Describe the nature of the light transmitted through: 1. A and C 2. A and B 3. B and C 4. A, B and C

Discussion

44.	How advancement of chemistry is used to prevent depletion of ozone by CFC?
Answer» How advancement of chemistry is used to prevent depletion of ozone by CFC?

Discussion

45.	24.A bulb is rated 100v,100w. Find the inductance of the choke coil that should be connected in series with the bulb to operate it with the help of an A-C source of 200v , 50hz.
Answer» 24.A bulb is rated 100v,100w. Find the inductance of the choke coil that should be connected in series with the bulb to operate it with the help of an A-C source of 200v , 50hz.

Discussion

46.	Three bulbs are rated as 20W 220V, 50W 220V & 100W 220V. i)If all the bulbs are connected in series then which one will glow more brightly. ii)If all the bulbs are connected in parallel then which one will glow more brightly?
Answer» Three bulbs are rated as 20W 220V, 50W 220V & 100W 220V. i)If all the bulbs are connected in series then which one will glow more brightly. ii)If all the bulbs are connected in parallel then which one will glow more brightly?

Discussion

47.	A student focuses the image of a when illuminated distant object on a screen using a convex lens.After that he gradually move the object towards lens and each time focuses its image on the screen by adjusting the lens. In which direction should he move the lens.
Answer» A student focuses the image of a when illuminated distant object on a screen using a convex lens.After that he gradually move the object towards lens and each time focuses its image on the screen by adjusting the lens. In which direction should he move the lens.

Discussion

48.	Why sky is blue?
Answer» Why sky is blue?

Discussion

49.	Calculate the heat capacity and water equivalent of 0.035 kg of copper . Specific heat capacity of copper is 389 JKg-1 k-1 given 1kcal=4185 J.
Answer» Calculate the heat capacity and water equivalent of 0.035 kg of copper . Specific heat capacity of copper is 389 JKg^-1k^-1given 1kcal=4185 J.

Discussion

50.	Which of the following sources of water will lead to infiltration of the water table?
Answer» Which of the following sources of water will lead to infiltration of the water table?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

An inductor of inductance L is decayed through a resistance R . The average life of a radioactive substances is T. Find R for which electrical energy stored in inductor to the activity of the sample is a constant.

what is the effective focal length when one surface of of a double convex lens has been silvered

ntangular speed of a wheel increases from 60rpm to 240rpm and in this duration wheel completes 4 revolutions .n ntfind angular acceleration and timen

Why does resistance become zero at critical temperature as in case of a super conductor?

an object and a concave mirror of focal length 20 cm approach each other with a speed of 1 cm/s and 2 cm/s respectively. at the instant when the object is at a distance of 15 cm from the mirror the speed of image isa:50 cm/sb:18 cm/s

Curvature of a spherical mirror??

light waves travel with the speed of 3*10^8 m/s.Express the speed in miles per hour.

The mass of the body on moon is 40 kg. What wii be the weight of the same body on the earth?

Which force is responsible for the flow of charge through the circuit

What effect does a convex lens have on parallel rays of light incident on it? In what way is the effect of a concave lens different?

The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have:(a) Maximum potential energy?(b) Maximum kinetic energy?​Give reason for your answer.

Cream from the milk is seperated by centrifugal method because:

A disc of mass m and radius R is rolling without slipping on a horizontal, fixed rough surface with translational velocity v as shown in the figure. Here, →LO and →LP represent the angular momentum about point O and P respectively. Which of the following is/are true?

A rectangular coil (Dimension 5 cm×2.5 cm) with 100 turns, carrying a current of 3 A in the clock-wise direction, is kept centered at the origin and in the X-Z plane. A magnetic field of 1 T is applied along X-axis. If the coil is tilted through 45∘ about Z-axis, then the torque on the coil is

Definition for magnetic field &amp; field line.

Angle of minimum deviation is equal to the angle of prism A of an equilateral glass prism. The angle of incidence at which minimum deviation will be obtained is

Twelve resistors each of resistance 18 Ω are connected in a circuit as shown. The net resistance between AB is

For the effective working of wind mills, the minimum wind speed required is

what are reagents and substrat

Sin^2wt- cos^2wt is shm or periodic motion

The swimming pool appears to be less deep than it actually is. Which phenomenon is responsible for it?

Happens to the eye when you enter a dark cinema hall from bright sunshine? Give reasons for your answer.

Consider the following processes: 1. Wind rotates the blades of the windmill 2. Electrical energy produced 3. Turbine rotates 4. Blowing of wind Which of the following predicts the correct order of events?

what is difference between potensial and potensial difference

Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens, when an object is placed beyond 2F.

Akshit knows that water in rivers, ponds and oceans is in liquid state but he is not sure about where he can get other forms of water viz. ice and water vapour. Can you tell him about different sources where he can get other forms of water ? [3 MARKS]

Can visible light be scattered by atoms/ molecules in earth's atmosphere?

Name three factors that affect climate. [3 MARKS]

how does light wave travel

Which of the following represent a circuit diagram for the given circuit?Where green color shows the switch is ON and the red color indicates the switch is OFF.

If a tunning fork is vibrating freely, then its vibration will be:

When a body vibrates under a periodic force, the vibrations of the body are :

Choose the position of object, kept before a lens to form image of same size as that of the object.

Answer the following questions in your own words.(a) What is meant by scattering of light ?(b) Does the shadow really vanish in the zero shadow condition?(c) Will the laser beam be seen if it passes through a glass box which contains a lighted incense stick?

Question 12Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

The number of electrons must be removed from a conductor, so that it acquires a charge of 4.8nC

A plane mirror and an object approach each other with speeds of 5m/s and 10 m/s respectively. The speed of the image will be __.

The force which is compulsory to sustain uniform circular motion is

A radar is able to detect the reflected waves from an enemy aeroplane, after a time interval of 0.02 milliseconds. If the velocity of the wave is 3 x 108 m s-1, the distance of the plane from the radar station is:

A ,B,C are three filters. A transmits red, orange, yellow and green light. B transmits green and blue light and C transmits yellow light. Describe the nature of the light transmitted through: 1. A and C 2. A and B 3. B and C 4. A, B and C

How advancement of chemistry is used to prevent depletion of ozone by CFC?

24.A bulb is rated 100v,100w. Find the inductance of the choke coil that should be connected in series with the bulb to operate it with the help of an A-C source of 200v , 50hz.

Three bulbs are rated as 20W 220V, 50W 220V & 100W 220V. i)If all the bulbs are connected in series then which one will glow more brightly. ii)If all the bulbs are connected in parallel then which one will glow more brightly?

A student focuses the image of a when illuminated distant object on a screen using a convex lens.After that he gradually move the object towards lens and each time focuses its image on the screen by adjusting the lens. In which direction should he move the lens.

Why sky is blue?

Calculate the heat capacity and water equivalent of 0.035 kg of copper . Specific heat capacity of copper is 389 JKg​​​​-1 k​​​​​​-1 given 1kcal=4185 J.

Which of the following sources of water will lead to infiltration of the water table?

The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have:(a) Maximum potential energy?(b) Maximum kinetic energy?Give reason for your answer.

Definition for magnetic field & field line.

Calculate the heat capacity and water equivalent of 0.035 kg of copper . Specific heat capacity of copper is 389 JKg-1 k-1 given 1kcal=4185 J.