16569 + Interview Questions in Physics

1.	What is nuclear fission?
Answer» What is nuclear fission?

Discussion

2.	if the length of secods hand in a clock is 1m the change of velocity of its tip oin 15 s is
Answer» if the length of secods hand in a clock is 1m the change of velocity of its tip oin 15 s is

Discussion

3.	In this circuit shown, the potential drop across capacitor C1 and C2 respectively is (assuming the two diodes are ideal)
Answer» In this circuit shown, the potential drop across capacitor $C_{1}$ and $C_{2}$ respectively is (assuming the two diodes are ideal)

Discussion

4.	48.A telescope has an objective lens of focal length 100cm and eye piece of focal length 1cm . If this telescope is used to see 25cm meter tall building at a distance of 1km what is height of image formed by objective lens (Q3)
Answer» 48.A telescope has an objective lens of focal length 100cm and eye piece of focal length 1cm . If this telescope is used to see 25cm meter tall building at a distance of 1km what is height of image formed by objective lens (Q3)

Discussion

5.	When heat Q is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by ΔT. The heat required to produce the same change in tempreture at a constant pressure is
Answer» When heat $Q$ is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by $Δ T$ . The heat required to produce the same change in tempreture at a constant pressure is

Discussion

6.	How many images will you see when two plane mirrors are perpendicular to each other?
Answer» How many images will you see when two plane mirrors are perpendicular to each other?

Discussion

7.	A simple microscope has a magnifying power of 3.0 when the image is formed at the near point (25 cm) of a normal eye. What is its focal length?
Answer» A simple microscope has a magnifying power of $3.0$ when the image is formed at the near point $(25 cm)$ of a normal eye. What is its focal length?

Discussion

8.	Two single phase transformers having the same voltage ratio on no-load operate in parallel to supply a load of 1500 kVA at 0.8 p.f. lagging. One transformer is rated at 700 kVA and has a per unit equivalent impedance of (0.01+j0.06) and the other is rated at 800 kVA and has per unit impedance of (0.01+j0.05). The load shared by transformer 1 will be ______kVA. (Answer upto 2 decimal places)634.85
Answer» Two single phase transformers having the same voltage ratio on no-load operate in parallel to supply a load of 1500 kVA at 0.8 p.f. lagging. One transformer is rated at 700 kVA and has a per unit equivalent impedance of (0.01+j0.06) and the other is rated at 800 kVA and has per unit impedance of (0.01+j0.05). The load shared by transformer 1 will be ______kVA. (Answer upto 2 decimal places) 634.85

Discussion

9.	In the following circuits (Figure 12.2), heat produced in the resistor or combination of resistors connected to a 12 V battery will be:
Answer» In the following circuits (Figure 12.2), heat produced in the resistor or combination of resistors connected to a 12 V battery will be:

9.

In the following circuits (Figure 12.2), heat produced in the resistor or combination of resistors connected to a 12 V battery will be:

Answer»

In the following circuits (Figure 12.2), heat produced in the resistor or combination of resistors connected to a 12 V battery will be:

Discussion

10.	A particles of mass m move with constant velocity v on circular path of radius r find magnitude of average force on it in half revolution
Answer» A particles of mass m move with constant velocity v on circular path of radius r find magnitude of average force on it in half revolution

Discussion

11.	A 1250 W, 115 V heater operates at 115 V. What is the resistance of the heating coil?
Answer» A 1250 W, 115 V heater operates at 115 V. What is the resistance of the heating coil?

Discussion

12.	What is meant by point charge
Answer» What is meant by point charge

Discussion

13.	Which of the following forests are found in the regions having rainfall between 100 cm to 70 cm?
Answer» Which of the following forests are found in the regions having rainfall between 100 cm to 70 cm?

Discussion

14.	Consider the following frame The magnitude of bending moment at section x-x is ______ kNm.80
Answer» Consider the following frame The magnitude of bending moment at section x-x is ______ kNm. 80

Discussion

15.	What is the meaning of the term 'frequency' of an alternating current? What is its value in India?Why is an alternating current considered to be advantageous over direct current for long-range transmission of electric energy?
Answer» What is the meaning of the term 'frequency' of an alternating current? What is its value in India? Why is an alternating current considered to be advantageous over direct current for long-range transmission of electric energy?

Discussion

16.	Question 37Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of –50 cm. What is the nature of the lens and its power used by each of them?
Answer» Question 37 Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of –50 cm. What is the nature of the lens and its power used by each of them?

Discussion

17.	How much current will a heating device draw from a 180 V source, if the resistance of the geyser is 100 Ω?
Answer» How much current will a heating device draw from a $180 V$ source, if the resistance of the geyser is $100 Ω$ ?

Discussion

18.	rain is falling with a speed 0f 4 m/s in a direction making 30 with vertical towards south.what should be the magnitude and direction of cyclist to hold his umbrella exactly vertical so rain does not wet him?
Answer» rain is falling with a speed 0f 4 m/s in a direction making 30 with vertical towards south.what should be the magnitude and direction of cyclist to hold his umbrella exactly vertical so rain does not wet him?

Discussion

19.	9. A spring of force constant 800 N/m has anextension of 5 cm. The work done in extendingit from 5 cm to 15 cm is (A.I.E.E.E. 2002)(1) 16 J(2) 8 J(3) 32 J(4) 24 JT:
Answer» 9. A spring of force constant 800 N/m has anextension of 5 cm. The work done in extendingit from 5 cm to 15 cm is (A.I.E.E.E. 2002)(1) 16 J(2) 8 J(3) 32 J(4) 24 JT:

Discussion

20.	Two light bulbs are marked 230 V; 75 W and 230 V; 150 W. If the first bulb has a resistance R, then the resistance of the second is;
Answer» Two light bulbs are marked 230 V; 75 W and 230 V; 150 W. If the first bulb has a resistance R, then the resistance of the second is;

Discussion

21.	If you are stuck in a forest, then which source of energy would you prefer and why?
Answer» If you are stuck in a forest, then which source of energy would you prefer and why?

Discussion

22.	An infinitely long line of charge of linear charge densityλ. The potential difference between two points A and B as shown in figure is –
Answer» An infinitely long line of charge of linear charge density $λ .$ The potential difference between two points $A$ and $B$ as shown in figure is –

Discussion

23.	What are the methods used by plants to get rid of wastes?
Answer» What are the methods used by plants to get rid of wastes?

Discussion

24.	State which has higher resistance a 50W or 25W lamp ?why?
Answer» State which has higher resistance a 50W or 25W lamp ?why?

Discussion

25.	The temperature of 600 g of cold water rises by 15∘C when 300 g of hot water at 50∘C is added to it. What was the initial temperature of the cold water?
Answer» The temperature of 600 g of cold water rises by $15^{\circ} C$ when 300 g of hot water at $50^{\circ} C$ is added to it. What was the initial temperature of the cold water?

Discussion

26.	If the number of turns in a coil is doubled without any change in the length of the coil, its self-inductance becomes.
Answer» If the number of turns in a coil is doubled without any change in the length of the coil, its self-inductance becomes.

Discussion

27.	Explain conduction current and displacement current,and cases when they are present
Answer» Explain conduction current and displacement current,and cases when they are present

Discussion

28.	A concave mirror is held in water. What would be the change in the focal length of the mirror?
Answer» A concave mirror is held in water. What would be the change in the focal length of the mirror?

Discussion

29.	Three resistance 5 Ω, 5 Ω and 6 Ω are connected as shown in figure. If the point S divides the resistance 6 Ω into two equal halves, the resistance between points P and S is
Answer» Three resistance $5 Ω, 5 Ω$ and $6 Ω$ are connected as shown in figure. If the point $S$ divides the resistance $6 Ω$ into two equal halves, the resistance between points $P$ and $S$ is

Discussion

30.	Identify the mirror which can form a diminished virtual image of a tall building?
Answer» Identify the mirror which can form a diminished virtual image of a tall building?

Discussion

31.	If the length of a conductor is increased to 36%.what is the increased percent in his restistance
Answer» If the length of a conductor is increased to 36%.what is the increased percent in his restistance

Discussion

32.	The magnification of an object placed in front of a convex lens of focal length 20 cm is +2 . To obtain a magnification of −2, the object will have to be moved a distance equal to
Answer» The magnification of an object placed in front of a convex lens of focal length $20 cm$ is $+ 2$ . To obtain a magnification of $- 2$ , the object will have to be moved a distance equal to

Discussion

33.	The pressure exerted by exactly 1 mm of mercury column at 0∘ and at standard gravity is termed as
Answer» The pressure exerted by exactly 1 mm of mercury column at $0^{\circ}$ and at standard gravity is termed as

Discussion

34.	The speed of light in diamond is 125,000 km ms−1. What is its refractive index? (Speed of light in air = 3 ×108ms−1 )
Answer» The speed of light in diamond is 125,000 km $m s^{- 1}$ . What is its refractive index? (Speed of light in air = 3 $\times 10^{8} m s^{- 1}$ )

Discussion

35.	The self inductance of a coil having 400 turns is 10mH. The magnetic Flux through the cross section of the coil corresponding to current 2mA is
Answer» The self inductance of a coil having 400 turns is 10mH. The magnetic Flux through the cross section of the coil corresponding to current 2mA is

Discussion

36.	A cardboard had iron fillings spread over it and a straight current carrying conductor passes through the centre of it. When the direction of current is reversed, what happens?
Answer» A cardboard had iron fillings spread over it and a straight current carrying conductor passes through the centre of it. When the direction of current is reversed, what happens?

Discussion

37.	In the following circuit, calculate the value of the electric current (i). 3.46228
Answer» In the following circuit, calculate the value of the electric current (i). 3.46228

Discussion

38.	A ray of light moving along the unit(-i-2j undergoes refractionvectorat an interface of two media, which isthe x -z plane. The refractive index fory >0 is 2 while for y < 0, it is 5/2.The angle of refraction is:
Answer» A ray of light moving along the unit(-i-2j undergoes refractionvectorat an interface of two media, which isthe x -z plane. The refractive index fory >0 is 2 while for y < 0, it is 5/2.The angle of refraction is:

Discussion

39.	Observe the images and form the word.
Answer» Observe the images and form the word.

Discussion

40.	Find the angle at which a ray must be incident on a glass prism of refracting angle 75 degree such that emergent ray comes out parallel to the face through which it comes out. (refractive index of glass is root2 (1.414) )
Answer» Find the angle at which a ray must be incident on a glass prism of refracting angle 75 degree such that emergent ray comes out parallel to the face through which it comes out. (refractive index of glass is root2 (1.414) )

Discussion

41.	Imagine a Carnot engine that operates between the temperatures TH 850 K and TL 300 K. The engine performs 1200 J of work each cycle, which takes 0.25 s. What is the efficiency of this engine?
Answer» Imagine a Carnot engine that operates between the temperatures $T_{H}$ 850 K and $T_{L}$ 300 K. The engine performs 1200 J of work each cycle, which takes 0.25 s. What is the efficiency of this engine?

Discussion

42.	A certain form of energy which is not sourced directly or indirectly from the sun and does not cause any pollution is very easily converted into electricity. This form of energy is, however, not available everywhere. Moreover, it is technically very difficult and expensive to obtain it. Name the form of energy.
Answer» A certain form of energy which is not sourced directly or indirectly from the sun and does not cause any pollution is very easily converted into electricity. This form of energy is, however, not available everywhere. Moreover, it is technically very difficult and expensive to obtain it. Name the form of energy.

Discussion

43.	Five bulbs of 60 W each and 2 fans of 100 W each are used for 8 hours a day. Calculate the monthly bill if 1 kWh is costing Rs 1.50.
Answer» Five bulbs of 60 W each and 2 fans of 100 W each are used for 8 hours a day. Calculate the monthly bill if 1 kWh is costing Rs 1.50.

Discussion

44.	A charge q is placed in non uniform electric field E=2t^2 where t is the time . Find it's velocity and displacement as function of time (assume mass of particle to be m).
Answer» A charge q is placed in non uniform electric field E=2t^2 where t is the time . Find it's velocity and displacement as function of time (assume mass of particle to be m).

Discussion

45.	. Find the angle of deviation if angle of incidence is 35 degree
Answer» . Find the angle of deviation if angle of incidence is 35 degree

Discussion

46.	(a) What is geothermal energy ? (b) What is the source of heat contained in geothermal energy ? (c) Explain how, geothermal energy is used to generate electricity. (d) State two advantages of geothermal energy. (e) State two disadvantages of geothermal energy.
Answer» (a) What is geothermal energy ? (b) What is the source of heat contained in geothermal energy ? (c) Explain how, geothermal energy is used to generate electricity. (d) State two advantages of geothermal energy. (e) State two disadvantages of geothermal energy.

Discussion

47.	Steam at 100∘C is passed into 1.1kg of water contained in a calorimeter of water equivalent 0.02kg at 15∘C till the temperature of the calorimeter and its contents reaches 80∘C. Considering the latent heat of steam =540calg−1 and specific heat capacity of water =4183Jkg−1K−1 or =1calkg−1K−1, calculate the mass of the steam condensed.
Answer» Steam at $100^{\circ} C$ is passed into $1.1 k g$ of water contained in a calorimeter of water equivalent $0.02 k g$ at $15^{\circ} C$ till the temperature of the calorimeter and its contents reaches $80^{\circ} C$ . Considering the latent heat of steam $= 540 c a l g^{- 1}$ $and s$ pecific heat capacity of water $= 4183 J k g^{- 1} K^{- 1}$ ${or}$ $= 1 c a l k g^{- 1} K^{- 1}$ , calculate the mass of the steam condensed.

Discussion

48.	A chain of mass 'm' and length 'l' is kept in three positions as shown below. Assuming h = 0 on the ground find potential energy of the chain in all three cases.
Answer» A chain of mass 'm' and length 'l' is kept in three positions as shown below. Assuming h = 0 on the ground find potential energy of the chain in all three cases.

Discussion

49.	An ideal block and tackle system of 5 pulleys consist of 3 pulleys in the upper block and 2 pulleys in the lower block. If the load is raised by 1 m, through what distance will effort move.
Answer» An ideal block and tackle system of 5 pulleys consist of 3 pulleys in the upper block and 2 pulleys in the lower block. If the load is raised by 1 m, through what distance will effort move.

Discussion

50.	The current I enters the circular loop of uniform wire of radius r at A and leaves it at B. the magnetic field of the centre of circular loop is
Answer» The current I enters the circular loop of uniform wire of radius r at A and leaves it at B. the magnetic field of the centre of circular loop is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is nuclear fission?

if the length of secods hand in a clock is 1m the change of velocity of its tip oin 15 s is

In this circuit shown, the potential drop across capacitor C1 and C2 respectively is (assuming the two diodes are ideal)

48.A telescope has an objective lens of focal length 100cm and eye piece of focal length 1cm . If this telescope is used to see 25cm meter tall building at a distance of 1km what is height of image formed by objective lens (Q3)

When heat Q is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by ΔT. The heat required to produce the same change in tempreture at a constant pressure is

How many images will you see when two plane mirrors are perpendicular to each other?

A simple microscope has a magnifying power of 3.0 when the image is formed at the near point (25 cm) of a normal eye. What is its focal length?

In the following circuits (Figure 12.2), heat produced in the resistor or combination of resistors connected to a 12 V battery will be:

A particles of mass m move with constant velocity v on circular path of radius r find magnitude of average force on it in half revolution

A 1250 W, 115 V heater operates at 115 V. What is the resistance of the heating coil?

What is meant by point charge

Which of the following forests are found in the regions having rainfall between 100 cm to 70 cm?

Consider the following frame The magnitude of bending moment at section x-x is ______ kNm.80

What is the meaning of the term 'frequency' of an alternating current? What is its value in India?Why is an alternating current considered to be advantageous over direct current for long-range transmission of electric energy?

Question 37Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of –50 cm. What is the nature of the lens and its power used by each of them?

How much current will a heating device draw from a 180 V source, if the resistance of the geyser is 100 Ω?

rain is falling with a speed 0f 4 m/s in a direction making 30 with vertical towards south.what should be the magnitude and direction of cyclist to hold his umbrella exactly vertical so rain does not wet him?

9. A spring of force constant 800 N/m has anextension of 5 cm. The work done in extendingit from 5 cm to 15 cm is (A.I.E.E.E. 2002)(1) 16 J(2) 8 J(3) 32 J(4) 24 JT:

Two light bulbs are marked 230 V; 75 W and 230 V; 150 W. If the first bulb has a resistance R, then the resistance of the second is;

If you are stuck in a forest, then which source of energy would you prefer and why?

An infinitely long line of charge of linear charge densityλ. The potential difference between two points A and B as shown in figure is –

What are the methods used by plants to get rid of wastes?

State which has higher resistance a 50W or 25W lamp ?why?

The temperature of 600 g of cold water rises by 15∘C when 300 g of hot water at 50∘C is added to it. What was the initial temperature of the cold water?

If the number of turns in a coil is doubled without any change in the length of the coil, its self-inductance becomes.

Explain conduction current and displacement current,and cases when they are present

A concave mirror is held in water. What would be the change in the focal length of the mirror?

Three resistance 5 Ω, 5 Ω and 6 Ω are connected as shown in figure. If the point S divides the resistance 6 Ω into two equal halves, the resistance between points P and S is

Identify the mirror which can form a diminished virtual image of a tall building?

If the length of a conductor is increased to 36%.what is the increased percent in his restistance

The magnification of an object placed in front of a convex lens of focal length 20 cm is +2 . To obtain a magnification of −2, the object will have to be moved a distance equal to

The pressure exerted by exactly 1 mm of mercury column at 0∘ and at standard gravity is termed as

The speed of light in diamond is 125,000 km ms−1. What is its refractive index? (Speed of light in air = 3 ×108ms−1 )

The self inductance of a coil having 400 turns is 10mH. The magnetic Flux through the cross section of the coil corresponding to current 2mA is

A cardboard had iron fillings spread over it and a straight current carrying conductor passes through the centre of it. When the direction of current is reversed, what happens?

In the following circuit, calculate the value of the electric current (i). 3.46228

A ray of light moving along the unit(-i-2j undergoes refractionvectorat an interface of two media, which isthe x -z plane. The refractive index fory >0 is 2 while for y < 0, it is 5/2.The angle of refraction is:

Observe the images and form the word.

Find the angle at which a ray must be incident on a glass prism of refracting angle 75 degree such that emergent ray comes out parallel to the face through which it comes out. (refractive index of glass is root2 (1.414) )

Imagine a Carnot engine that operates between the temperatures TH 850 K and TL 300 K. The engine performs 1200 J of work each cycle, which takes 0.25 s. What is the efficiency of this engine?

Five bulbs of 60 W each and 2 fans of 100 W each are used for 8 hours a day. Calculate the monthly bill if 1 kWh is costing Rs 1.50.

A charge q is placed in non uniform electric field E=2t^2 where t is the time . Find it's velocity and displacement as function of time (assume mass of particle to be m).

. Find the angle of deviation if angle of incidence is 35 degree

(a) What is geothermal energy ? (b) What is the source of heat contained in geothermal energy ? (c) Explain how, geothermal energy is used to generate electricity. (d) State two advantages of geothermal energy. (e) State two disadvantages of geothermal energy.

A chain of mass 'm' and length 'l' is kept in three positions as shown below. Assuming h = 0 on the ground find potential energy of the chain in all three cases.

An ideal block and tackle system of 5 pulleys consist of 3 pulleys in the upper block and 2 pulleys in the lower block. If the load is raised by 1 m, through what distance will effort move.

The current I enters the circular loop of uniform wire of radius r at A and leaves it at B. the magnetic field of the centre of circular loop is