16569 + Interview Questions in Physics

1.	A wire of resistance 16 ohm is doubled over itself.what will be its new resistance
Answer» A wire of resistance 16 ohm is doubled over itself.what will be its new resistance

Discussion

2.	A 100 MVA, 220 kV/110 kV Δ−Δ,3−ϕ power transformer has a resistance of 0.02 per unit and a reactance of 0.05 per unit.The transformer supplies a load of 80 MVA at 0.8 pf lagging. The percentage voltage regulation of the transformer is __________%.3.7
Answer» A 100 MVA, 220 kV/110 kV $Δ - Δ, 3 - ϕ$ power transformer has a resistance of 0.02 per unit and a reactance of 0.05 per unit.The transformer supplies a load of 80 MVA at 0.8 pf lagging. The percentage voltage regulation of the transformer is __________%. 3.7

Discussion

3.	A ray of light is incident on a surface of glass slab at an angle 45∘. If the lateral shift produced per unit thickness is 1√3 m, the angle of refraction produced is
Answer» A ray of light is incident on a surface of glass slab at an angle $45^{\circ}$ . If the lateral shift produced per unit thickness is $\frac{1}{\sqrt{3}} m$ , the angle of refraction produced is

Discussion

4.	An equi-convex lens has power P. It is cut into four symmetrical pieces as shown with (A,B,C and D). Then all the four parts are arrangement as shown in the figure (ii). The focal length of the combination.
Answer» An equi-convex lens has power $P$ . It is cut into four symmetrical pieces as shown with $(A, B, C$ and $D) .$ Then all the four parts are arrangement as shown in the figure (ii). The focal length of the combination.

Discussion

5.	Common moderator used in the nuclear reactor is ___ .
Answer» Common moderator used in the nuclear reactor is ___ .

Discussion

6.	What do you understand by the term magnification ? Write expression for it for a lens, explaining the meaning of the symbols used.
Answer» What do you understand by the term magnification ? Write expression for it for a lens, explaining the meaning of the symbols used.

Discussion

7.	200 g of ice at 0∘C convert into water at 0∘C in 1 minute when heat is supplied to it at a constant rate.In how much time 200 g of water at 0∘C will change to 20∘C?Take specific latent heat of ice =336 ) J g−1.
Answer» 200 g of ice at $0^{\circ} C$ convert into water at $0^{\circ} C$ in 1 minute when heat is supplied to it at a constant rate.In how much time 200 g of water at $0^{\circ} C$ will change to $20^{\circ} C$ ?Take specific latent heat of ice =336 ) J $g^{- 1}$ .

Discussion

8.	A 4 m long rod of negligible weight is supported at a point 125 cm from its one end and a load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm. (a) if a weight W is placed at a distance of 250 cm from the support on the longer arm, find W. (b) If a weight 5 kgf is kept to balance the rod, find the position. (c) To which class of lever does it belong?
Answer» A 4 m long rod of negligible weight is supported at a point 125 cm from its one end and a load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm. (a) if a weight W is placed at a distance of 250 cm from the support on the longer arm, find W. (b) If a weight 5 kgf is kept to balance the rod, find the position. (c) To which class of lever does it belong?

8.

A 4 m long rod of negligible weight is supported at a point 125 cm from its one end and a load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm. (a) if a weight W is placed at a distance of 250 cm from the support on the longer arm, find W. (b) If a weight 5 kgf is kept to balance the rod, find the position. (c) To which class of lever does it belong?

Answer»

A 4 m long rod of negligible weight is supported at a point 125 cm from its one end and a load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm.

(a) if a weight W is placed at a distance of 250 cm from the support on the longer arm, find W.

(b) If a weight 5 kgf is kept to balance the rod, find the position.

(c) To which class of lever does it belong?

Discussion

9.	An object is placed at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. Find the position of image. Is the image magnified ?
Answer» An object is placed at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. Find the position of image. Is the image magnified ?

Discussion

10.	Which of the following statements are correct regarding the greenhouse effect?
Answer» Which of the following statements are correct regarding the greenhouse effect?

Discussion

11.	Name any two elements that are used for fabricating solar cell
Answer» Name any two elements that are used for fabricating solar cell

Discussion

12.	Why is mercury used in thermometer?
Answer» Why is mercury used in thermometer?

Discussion

13.	The displacement time graph for the vibration of a particle is given below: The type of vibration of the particle is _______
Answer» The displacement time graph for the vibration of a particle is given below: The type of vibration of the particle is _______

Discussion

14.	Why is the mechanical advantage of the lever of second order alway greater than one?
Answer» Why is the mechanical advantage of the lever of second order alway greater than one?

Discussion

15.	A light ray of green colour is passed through a prism. Will it undergo dispersion?Explain.
Answer» A light ray of green colour is passed through a prism. Will it undergo dispersion?Explain.

Discussion

16.	Find equivalent resistance between A & B in the circuit:
Answer» Find equivalent resistance between A & B in the circuit:

Discussion

17.	According to Ohm's Law, what would be the resistance of a circuit with 40 volts and 8 amps?
Answer» According to Ohm's Law, what would be the resistance of a circuit with 40 volts and 8 amps?

Discussion

18.	Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs: (a) for decorating a hotel building from outside? (b) for lighting inside the rooms of the hotel?
Answer» Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs: (a) for decorating a hotel building from outside? (b) for lighting inside the rooms of the hotel?

Discussion

19.	Dos polarity changes in dc generator
Answer» Dos polarity changes in dc generator

Discussion

20.	A cylindrical cavity of diameter a exists inside a cylinder of diameter 2a as shown in the figure. Both the cylinder and the cavity are nfinitely long. A uniform current density j flows along the length. If the magnitude of the magnetic filed at the point P is given by N12μ0aj, then the value of N is
Answer» A cylindrical cavity of diameter a exists inside a cylinder of diameter 2a as shown in the figure. Both the cylinder and the cavity are nfinitely long. A uniform current density j flows along the length. If the magnitude of the magnetic filed at the point P is given by $\frac{N}{12} μ_{0} a j$ , then the value of N is

Discussion

21.	If you are in a dark empty room and are given two identical bars ( same mass ,same size, same weight and same texture). One of them is a bar magnet and the other one is an iron bar. There is nothing else in the room. You have to come out of the room with the magnet and leave the iron bar behind. Find a way to identify the magnet bar and the iron bar.
Answer» If you are in a dark empty room and are given two identical bars ( same mass ,same size, same weight and same texture). One of them is a bar magnet and the other one is an iron bar. There is nothing else in the room. You have to come out of the room with the magnet and leave the iron bar behind. Find a way to identify the magnet bar and the iron bar.

21.

If you are in a dark empty room and are given two identical bars ( same mass ,same size, same weight and same texture). One of them is a bar magnet and the other one is an iron bar. There is nothing else in the room. You have to come out of the room with the magnet and leave the iron bar behind. Find a way to identify the magnet bar and the iron bar.

Answer»

If you are in a dark empty room and are given two identical bars ( same mass ,same size, same weight and same texture). One of them is a bar magnet and the other one is an iron bar. There is nothing else in the room. You have to come out of the room with the magnet and leave the iron bar behind.

Find a way to identify the magnet bar and the iron bar.

Discussion

22.	Mirages is an image what is the object
Answer» Mirages is an image what is the object

Discussion

23.	Name the defect of vision in a person : (a) whose near point is more than 25 cm away. (b) whose far point is less than infinity
Answer» Name the defect of vision in a person : (a) whose near point is more than 25 cm away. (b) whose far point is less than infinity

Discussion

24.	Name two factors on which the internal resistance of a cell depends and state how does it depend on the factors stated by you.
Answer» Name two factors on which the internal resistance of a cell depends and state how does it depend on the factors stated by you.

Discussion

25.	Write the expressions for the equivalent resistance R of three resistors R1,R2 and R3 joined in (a) parallel, and (b) series.
Answer» Write the expressions for the equivalent resistance R of three resistors $R_{1}, R_{2}$ and $R_{3}$ joined in (a) parallel, and (b) series.

Discussion

26.	A block of ice at -10∘C is slowly heated and converted to steam at 100∘C. Which of the following curves represents the phenomenon qualitatively?
Answer» A block of ice at - $10^{\circ} C$ is slowly heated and converted to steam at $100^{\circ} C$ . Which of the following curves represents the phenomenon qualitatively?

Discussion

27.	The magnetic field lines inside a long, current carrying solenoid are nearly
Answer» The magnetic field lines inside a long, current carrying solenoid are nearly

Discussion

28.	The angular momentum (L) of earth revolving round the sun is proportional to rn.Where r is the orbital radius of the earth.The value of n is (assume the orbit to be circular)
Answer» The angular momentum (L) of earth revolving round the sun is proportional to $r^{n}$ .Where r is the orbital radius of the earth.The value of n is (assume the orbit to be circular)

Discussion

29.	An enemy plane is at a distance of 300km from a radar. In how much time the radar will be able to detect the plane. Take velocity of radio waves as 3×10^8
Answer» An enemy plane is at a distance of 300km from a radar. In how much time the radar will be able to detect the plane. Take velocity of radio waves as 3×10^8

Discussion

30.	In the circuit diagram, the current flowing through the 2 ohm resistor is 1 ampere. Then the current flowing through the other resistors will be
Answer» In the circuit diagram, the current flowing through the 2 ohm resistor is 1 ampere. Then the current flowing through the other resistors will be

30.

In the circuit diagram, the current flowing through the 2 ohm resistor is 1 ampere. Then the current flowing through the other resistors will be

Answer»

In the circuit diagram, the current flowing through the 2 ohm resistor is 1 ampere. Then the current flowing through the other resistors will be

Discussion

31.	In the concave reflector of a torch, the bulb is placed : (a) between the pole and focus of reflector (b) at the focus of reflector (c) between focus and centre of curvature of reflector (d) at the centre of curvature of reflector
Answer» In the concave reflector of a torch, the bulb is placed : (a) between the pole and focus of reflector (b) at the focus of reflector (c) between focus and centre of curvature of reflector (d) at the centre of curvature of reflector

Discussion

32.	Two lamps, one rated 40W - 240 V and the other 60W- 240V are connected in parallel to 240 V supply. What current is drawn from the supply line?
Answer» Two lamps, one rated 40W - 240 V and the other 60W- 240V are connected in parallel to 240 V supply. What current is drawn from the supply line?

Discussion

33.	The image formed by a convex mirror is of size one-third the size of object. How are u and v related ?
Answer» The image formed by a convex mirror is of size one-third the size of object. How are u and v related ?

Discussion

34.	Choose the incorrect statement regarding wind power
Answer» Choose the incorrect statement regarding wind power

34.

Choose the incorrect statement regarding wind power

Answer»

Choose the incorrect statement regarding wind power

Discussion

35.	The relation between refractive index of a medium, real depth and apparent depth is
Answer» The relation between refractive index of a medium, real depth and apparent depth is

Discussion

36.	(a) With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is. (b) Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface.
Answer» (a) With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is. (b) Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface.

Discussion

37.	The effective resistance between P and Q is :
Answer» The effective resistance between P and Q is :

Discussion

38.	Which of the following options are correct?
Answer» Which of the following options are correct?

Discussion

39.	(a) Name the material used for making the connection wires. Give a reason for your answer. (b) Why should a connection wire be thick?
Answer» (a) Name the material used for making the connection wires. Give a reason for your answer. (b) Why should a connection wire be thick?

Discussion

40.	What is the main constituent of: (i) petroleum gas? (ii) natural gas?
Answer» What is the main constituent of: (i) petroleum gas? (ii) natural gas?

Discussion

41.	Name the agent which decomposes animal dung into biogas.
Answer» Name the agent which decomposes animal dung into biogas.

Discussion

42.	In one average-life,
Answer» In one average-life,

Discussion

43.	Name the phenomenon responsible for the following effect : When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.
Answer» Name the phenomenon responsible for the following effect : When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.

Discussion

44.	A sound wave has a frequency of 5kHz and wavelength of 25cm.How much distance will it travel in 5 seconds?
Answer» A sound wave has a frequency of 5kHz and wavelength of 25cm.How much distance will it travel in 5 seconds?

Discussion

45.	A pencil partly immersed in water in a glass tumbler appears to be displaced at the interface of air and water because
Answer» A pencil partly immersed in water in a glass tumbler appears to be displaced at the interface of air and water because

Discussion

46.	What is apparent shift ?
Answer» What is apparent shift ?

Discussion

47.	A light ray passes through the poles of all the four lenses given in the options individually. The maximum deviation of the light ray from its original path will be will be observe in which of the lenses?
Answer» A light ray passes through the poles of all the four lenses given in the options individually. The maximum deviation of the light ray from its original path will be will be observe in which of the lenses?

Discussion

48.	A truck of mass 1000 kg moving with a velocity of 40 kmh−1collides with a tree and comes to stop in 5 s. What will be the force exerted by a car on the tree?
Answer» A truck of mass 1000 kg moving with a velocity of 40 ${k m h}^{- 1}$ collides with a tree and comes to stop in 5 s. What will be the force exerted by a car on the tree?

Discussion

49.	The diagram in the figure shows a cell of e.m.f. ε=2 volt and internal resistance r = 1 ohm connected to an external resistance R = 4 ohm. The ammeter A measures the current in the circuit and the voltmeter V measures the terminal voltage across the cell. What will be the readings of the ammeter and voltmeter when (i) the key K is open, and (ii) the key K is closed?
Answer» The diagram in the figure shows a cell of e.m.f. $ε = 2$ volt and internal resistance r = 1 ohm connected to an external resistance R = 4 ohm. The ammeter A measures the current in the circuit and the voltmeter V measures the terminal voltage across the cell. What will be the readings of the ammeter and voltmeter when (i) the key K is open, and (ii) the key K is closed?

Discussion

50.	State whether the following statement is 'true' or 'false' : The deviation produced by a prism is independent of the angle of incidence and is the same for all colours of light.
Answer» State whether the following statement is 'true' or 'false' : The deviation produced by a prism is independent of the angle of incidence and is the same for all colours of light.

50.

State whether the following statement is 'true' or 'false' : The deviation produced by a prism is independent of the angle of incidence and is the same for all colours of light.

Answer»

State whether the following statement is 'true' or 'false' :

The deviation produced by a prism is independent of the angle of incidence and is the same for all colours of light.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A wire of resistance 16 ohm is doubled over itself.what will be its new resistance

A 100 MVA, 220 kV/110 kV Δ−Δ,3−ϕ power transformer has a resistance of 0.02 per unit and a reactance of 0.05 per unit.The transformer supplies a load of 80 MVA at 0.8 pf lagging. The percentage voltage regulation of the transformer is __________%.3.7

A ray of light is incident on a surface of glass slab at an angle 45∘. If the lateral shift produced per unit thickness is 1√3 m, the angle of refraction produced is

An equi-convex lens has power P. It is cut into four symmetrical pieces as shown with (A,B,C and D). Then all the four parts are arrangement as shown in the figure (ii). The focal length of the combination.

Common moderator used in the nuclear reactor is ___ .

What do you understand by the term magnification ? Write expression for it for a lens, explaining the meaning of the symbols used.

200 g of ice at 0∘C convert into water at 0∘C in 1 minute when heat is supplied to it at a constant rate.In how much time 200 g of water at 0∘C will change to 20∘C?Take specific latent heat of ice =336 ) J g−1.

An object is placed at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. Find the position of image. Is the image magnified ?

Which of the following statements are correct regarding the greenhouse effect?

Name any two elements that are used for fabricating solar cell

Why is mercury used in thermometer?

The displacement time graph for the vibration of a particle is given below: The type of vibration of the particle is _______

Why is the mechanical advantage of the lever of second order alway greater than one?

A light ray of green colour is passed through a prism. Will it undergo dispersion?Explain.

Find equivalent resistance between A &amp; B in the circuit:

According to Ohm's Law, what would be the resistance of a circuit with 40 volts and 8 amps?

Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs: (a) for decorating a hotel building from outside? (b) for lighting inside the rooms of the hotel?

Dos polarity changes in dc generator

Mirages is an image what is the object

Name the defect of vision in a person : (a) whose near point is more than 25 cm away. (b) whose far point is less than infinity

Name two factors on which the internal resistance of a cell depends and state how does it depend on the factors stated by you.

Write the expressions for the equivalent resistance R of three resistors R1,R2 and R3 joined in (a) parallel, and (b) series.

A block of ice at -10∘C is slowly heated and converted to steam at 100∘C. Which of the following curves represents the phenomenon qualitatively?

The magnetic field lines inside a long, current carrying solenoid are nearly

The angular momentum (L) of earth revolving round the sun is proportional to rn.Where r is the orbital radius of the earth.The value of n is (assume the orbit to be circular)

An enemy plane is at a distance of 300km from a radar. In how much time the radar will be able to detect the plane. Take velocity of radio waves as 3×10^8

In the circuit diagram, the current flowing through the 2 ohm resistor is 1 ampere. Then the current flowing through the other resistors will be

In the concave reflector of a torch, the bulb is placed : (a) between the pole and focus of reflector (b) at the focus of reflector (c) between focus and centre of curvature of reflector (d) at the centre of curvature of reflector

Two lamps, one rated 40W - 240 V and the other 60W- 240V are connected in parallel to 240 V supply. What current is drawn from the supply line?

The image formed by a convex mirror is of size one-third the size of object. How are u and v related ?

Choose the incorrect statement regarding wind power

The relation between refractive index of a medium, real depth and apparent depth is

(a) With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is. (b) Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface.

The effective resistance between P and Q is :

Which of the following options are correct?

(a) Name the material used for making the connection wires. Give a reason for your answer. (b) Why should a connection wire be thick?

What is the main constituent of: (i) petroleum gas? (ii) natural gas?

Name the agent which decomposes animal dung into biogas.

In one average-life,

Name the phenomenon responsible for the following effect : When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.

A sound wave has a frequency of 5kHz and wavelength of 25cm.How much distance will it travel in 5 seconds?

A pencil partly immersed in water in a glass tumbler appears to be displaced at the interface of air and water because

What is apparent shift ?

A light ray passes through the poles of all the four lenses given in the options individually. The maximum deviation of the light ray from its original path will be will be observe in which of the lenses?

A truck of mass 1000 kg moving with a velocity of 40 kmh−1collides with a tree and comes to stop in 5 s. What will be the force exerted by a car on the tree?

State whether the following statement is 'true' or 'false' : The deviation produced by a prism is independent of the angle of incidence and is the same for all colours of light.

Find equivalent resistance between A & B in the circuit: