16569 + Interview Questions in Physics

1.	Abs refractive index is always<or>then 1?
Answer» Abs refractive index is always<or>then 1?

Discussion

2.	A refrigerator converts 100 g of water at 20o C to ice at −10o C in 73.5 min. Calculate the average rate of heat extraction in watt. The specific heat capacity of water is 4.2 J g−1K−1, specific latent heat of ice is 336 J g−1 and the specific heat capacity of ice is 2.1 J g−1 K−1.
Answer» A refrigerator converts 100 g of water at $20^{o} C$ to ice at $- 10^{o} C$ in 73.5 min. Calculate the average rate of heat extraction in watt. The specific heat capacity of water is 4.2 J $g^{- 1} K^{- 1}$ , specific latent heat of ice is 336 J $g^{-} 1$ and the specific heat capacity of ice is 2.1 J $g^{- 1} K^{- 1}$ .

2.

A refrigerator converts 100 g of water at 20o C to ice at −10o C in 73.5 min. Calculate the average rate of heat extraction in watt. The specific heat capacity of water is 4.2 J g−1K−1, specific latent heat of ice is 336 J g−1 and the specific heat capacity of ice is 2.1 J g−1 K−1.

Answer»

A refrigerator converts 100 g of water at $20^{o} C$ to ice at $- 10^{o} C$ in 73.5 min. Calculate the average rate of heat extraction in watt. The specific heat capacity of water is 4.2 J $g^{- 1} K^{- 1}$ , specific latent heat of ice is 336 J $g^{-} 1$ and the specific heat capacity of ice is 2.1 J $g^{- 1} K^{- 1}$ .

Discussion

3.	List the characteristics of refraction of light.
Answer» List the characteristics of refraction of light.

Discussion

4.	Velocity of a car of mass 2 tonnes is increased from 36 km/hr to 144km/hr and while doing so it covers 100m. Calculate the force applied by its engine.
Answer» Velocity of a car of mass 2 tonnes is increased from 36 km/hr to 144km/hr and while doing so it covers 100m. Calculate the force applied by its engine.

Discussion

5.	When an object is placed between F and C of a concave mirror, the image is formed....................
Answer» When an object is placed between F and C of a concave mirror, the image is formed....................

Discussion

6.	A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid : (a) will decrease (b) will increase (c) will become zero (d) will remain the same
Answer» A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid : (a) will decrease (b) will increase (c) will become zero (d) will remain the same

6.

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid : (a) will decrease (b) will increase (c) will become zero (d) will remain the same

Answer»

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid :

(a) will decrease (b) will increase

(c) will become zero (d) will remain the same

Discussion

7.	Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between
Answer» Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between

Discussion

8.	Which of the following is a hydrophilic sol ?
Answer» Which of the following is a hydrophilic sol ?

Discussion

9.	In the figure, a uniform bar of length l m is supported at its ends and loaded by a weight W kgf at its middle. In equilibrium, find the reactions R1 and R2 at the ends.
Answer» In the figure, a uniform bar of length $l$ m is supported at its ends and loaded by a weight $W$ kgf at its middle. In equilibrium, find the reactions $R_{1} a n d R_{2}$ at the ends.

9.

In the figure, a uniform bar of length l m is supported at its ends and loaded by a weight W kgf at its middle. In equilibrium, find the reactions R1 and R2 at the ends.

Answer»

In the figure, a uniform bar of length $l$ m is supported at its ends and loaded by a weight $W$ kgf at its middle. In equilibrium, find the reactions $R_{1} a n d R_{2}$ at the ends.

Discussion

10.	A catalyst is a substance which [NCERT 1981; CPMT 1996
Answer» A catalyst is a substance which [NCERT 1981; CPMT 1996

Discussion

11.	Why does an electric bulb need to be vacuumed?
Answer» Why does an electric bulb need to be vacuumed?

Discussion

12.	What is the significance of building a dam in hydropower plants?
Answer» What is the significance of building a dam in hydropower plants?

Discussion

13.	Name the radiations of wavelength just (a) longer than 8×10−7m, (b) shorter than 4×10−7m.
Answer» Name the radiations of wavelength just (a) longer than $8 \times 10^{- 7} m,$ (b) shorter than $4 \times 10^{- 7} m$ .

Discussion

14.	A 1 kg piece of copper is drawn into a wire 1 mm2 thick, and another 1 kg copper piece into a wire, 2 mm2 thick. Compare the resistance of these wires.
Answer» A 1 kg piece of copper is drawn into a wire 1 mm² thick, and another 1 kg copper piece into a wire, 2 mm² thick. Compare the resistance of these wires.

Discussion

15.	What is specifc heat?
Answer» What is specifc heat?

Discussion

16.	Question 1 A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure. The current recorded in the ammeter will be (a) maximum in (i) (b) maximum in (ii) (c) maximum in (iii) (d) the same in all the cases
Answer» Question 1 A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure. The current recorded in the ammeter will be (a) maximum in (i) (b) maximum in (ii) (c) maximum in (iii) (d) the same in all the cases

Discussion

17.	Can I write x^6+y^6 as (x^3 +y^3) +(x^3+y^3)?
Answer» Can I write x^6+y^6 as (x^3 +y^3) +(x^3+y^3)?

Discussion

18.	Can you please differentiate between split rings and slip rings..
Answer» Can you please differentiate between split rings and slip rings..

Discussion

19.	How is work done by a force measured when the force: i) is in the direction of displacement ii) is at an angle to the direction of displacement
Answer» How is work done by a force measured when the force: i) is in the direction of displacement ii) is at an angle to the direction of displacement

Discussion

20.	What is the construction of AC Generator?
Answer» What is the construction of AC Generator?

Discussion

21.	Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80oC. The mass of the steam condensed in kg is
Answer» Steam at $100^{o} C$ is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at $15^{o} C$ till the temperature of the calorimeter and its contents rises to $80^{o} C .$ The mass of the steam condensed in kg is

Discussion

22.	What should be the angle between force and displacement be to get the 1 minimum work 2 maximum work
Answer» What should be the angle between force and displacement be to get the 1 minimum work 2 maximum work

22.

What should be the angle between force and displacement be to get the 1 minimum work 2 maximum work

Answer»

What should be the angle between force and displacement be to get the

1 minimum work

2 maximum work

Discussion

23.	Are gases are conductors or insulators? How about ionized gases?
Answer» Are gases are conductors or insulators? How about ionized gases?

Discussion

24.	The values of resistances A,B,C are given as 3R,6R ,R voltage is applied across P and Q. Heat energies dissipated ( electrical powers) in A,B,C are a) 2:3:4 b) 2:4:3 c) 4:2:3 d) 3:2:4
Answer» The values of resistances A,B,C are given as 3R,6R ,R voltage is applied across P and Q. Heat energies dissipated ( electrical powers) in A,B,C are a) 2:3:4 b) 2:4:3 c) 4:2:3 d) 3:2:4

Discussion

25.	Assuming the radius of the earth as R, the change in gravitational potential energy of a body of mass m, where it is taken from the earth's surface to a height 3R above its surface is
Answer» Assuming the radius of the earth as $R$ , the change in gravitational potential energy of a body of mass $m$ , where it is taken from the earth's surface to a height $3 R$ above its surface is

Discussion

26.	Question 8 The major problem in harnessing nuclear energy is how to
Answer» Question 8 The major problem in harnessing nuclear energy is how to

Discussion

27.	The sketches I to IV in Fig. 7.26 show sound waves, all formed in the same time interval. Which diagram shows (i) a note from a musical instrument, (ii) a soft (or feeble) note, (iii) a bass (or low frequency) note.
Answer» The sketches I to IV in Fig. 7.26 show sound waves, all formed in the same time interval. Which diagram shows (i) a note from a musical instrument, (ii) a soft (or feeble) note, (iii) a bass (or low frequency) note.

27.

The sketches I to IV in Fig. 7.26 show sound waves, all formed in the same time interval. Which diagram shows (i) a note from a musical instrument, (ii) a soft (or feeble) note, (iii) a bass (or low frequency) note.

Answer»

The sketches I to IV in Fig. 7.26 show sound waves, all formed in the same time interval.

Which diagram shows

(i) a note from a musical instrument,

(ii) a soft (or feeble) note,

(iii) a bass (or low frequency) note.

Discussion

28.	How does the resistance of the wire depend upon its radius?
Answer» How does the resistance of the wire depend upon its radius?

Discussion

29.	What is mean by virutal images
Answer» What is mean by virutal images

Discussion

30.	Choose the correct statements about 'Forced vibration':
Answer» Choose the correct statements about 'Forced vibration':

Discussion

31.	A bimetallic strip bends on heating due to?
Answer» A bimetallic strip bends on heating due to?

Discussion

32.	Full explanation on dew point and humidity
Answer» Full explanation on dew point and humidity

Discussion

33.	What should be the value of x, if voltage drop across x is 1 V.
Answer» What should be the value of x, if voltage drop across x is 1 V.

Discussion

34.	Why amplitude rises when the frequency of forced vibration matches the natural frequency of a body?
Answer» Why amplitude rises when the frequency of forced vibration matches the natural frequency of a body?

Discussion

35.	If I completely annihilate a hair of your body that has a mass of 1 μg then how much energy will I get in the process.
Answer» If I completely annihilate a hair of your body that has a mass of $1 μ g$ then how much energy will I get in the process.

Discussion

36.	Which type of lenses are : (a) thinner in the middle than at the edges ? (b) thicker in the middle than at the edges ?
Answer» Which type of lenses are : (a) thinner in the middle than at the edges ? (b) thicker in the middle than at the edges ?

Discussion

37.	Which type of mirror could be used as a dentist's mirror ?
Answer» Which type of mirror could be used as a dentist's mirror ?

Discussion

38.	A person is standing 1 km away from a source of sound. If the velocity of sound in the medium is 340 ms−1, then calculate the number of oscillations (approximately) that the particles near the source complete before the sound wave reaches that person. The frequency of the sound is 500 Hz.
Answer» A person is standing $1 k m$ away from a source of sound. If the velocity of sound in the medium is $340 m s^{- 1}$ , then calculate the number of oscillations (approximately) that the particles near the source complete before the sound wave reaches that person. The frequency of the sound is $500 H z$ .

Discussion

39.	The slurry left behind in a biogas plant is used for what purpose?
Answer» The slurry left behind in a biogas plant is used for what purpose?

Discussion

40.	An electric heater of power 3 kW is used for 10 h.How much energy does it consume? Express your answer in (i) kWh, (ii) joule.
Answer» An electric heater of power 3 kW is used for 10 h.How much energy does it consume? Express your answer in (i) kWh, (ii) joule.

Discussion

41.	A coil is connected to a galvanometer. When the N-pole of a magnet is pushed into the coil the galvanometer deflected to the right . What deflection, if any, is observed when : (a) the N-pole is removed ? (b) the S-pole is inserted ? (c) the magnet is at rest in the coil ? State three ways of increasing the deflection on the galvanometer.
Answer» A coil is connected to a galvanometer. When the N-pole of a magnet is pushed into the coil the galvanometer deflected to the right . What deflection, if any, is observed when : (a) the N-pole is removed ? (b) the S-pole is inserted ? (c) the magnet is at rest in the coil ? State three ways of increasing the deflection on the galvanometer.

41.

A coil is connected to a galvanometer. When the N-pole of a magnet is pushed into the coil the galvanometer deflected to the right . What deflection, if any, is observed when : (a) the N-pole is removed ? (b) the S-pole is inserted ? (c) the magnet is at rest in the coil ? State three ways of increasing the deflection on the galvanometer.

Answer»

A coil is connected to a galvanometer. When the N-pole of a magnet is pushed into the coil the galvanometer deflected to the right . What deflection, if any, is observed when :

(a) the N-pole is removed ?

(b) the S-pole is inserted ?

(c) the magnet is at rest in the coil ?

State three ways of increasing the deflection on the galvanometer.

Discussion

42.	Nowadays we are using alternative or non-conventional sources of energy more. Why?
Answer» Nowadays we are using alternative or non-conventional sources of energy more. Why?

Discussion

43.	Bacteria produce methane gas in sewage-treatment plants. This gas is often captured or burned. If a bacterial culture produces 60.0 mL of methane gas at 700.0 mm Hg, what volume would be produced at 760.0 mm Hg?
Answer» Bacteria produce methane gas in sewage-treatment plants. This gas is often captured or burned. If a bacterial culture produces 60.0 mL of methane gas at 700.0 mm Hg, what volume would be produced at 760.0 mm Hg?

Discussion

44.	Q16. Consider the following statements: 1. Brabo is touted as India’s first indigenously made industrial articulated robot for micro, small and medium enterprises. 2. Indore has become the India’s first city where robot is being used on an experimental basis to control its ever growing and unruly traffic. Which of the above statements are correct?
Answer» Q16. Consider the following statements: 1. Brabo is touted as India’s first indigenously made industrial articulated robot for micro, small and medium enterprises. 2. Indore has become the India’s first city where robot is being used on an experimental basis to control its ever growing and unruly traffic. Which of the above statements are correct?

44.

Q16. Consider the following statements: 1. Brabo is touted as India’s first indigenously made industrial articulated robot for micro, small and medium enterprises. 2. Indore has become the India’s first city where robot is being used on an experimental basis to control its ever growing and unruly traffic. Which of the above statements are correct?

Answer»

Q16. Consider the following statements:

1. Brabo is touted as India’s first indigenously made industrial articulated robot for micro, small and medium enterprises.

2. Indore has become the India’s first city where robot is being used on an experimental basis to control its ever growing and unruly traffic.

Which of the above statements are correct?

Discussion

45.	4 identical resistors each of resistance 4 ohm are joined in a circuit .The cell B is of 2v and internal resistance is neglibile Find the current reading of ammeter
Answer» 4 identical resistors each of resistance 4 ohm are joined in a circuit .The cell B is of 2v and internal resistance is neglibile Find the current reading of ammeter

Discussion

46.	Define one coulomb charge.
Answer» Define one coulomb charge.

Discussion

47.	Which unit among the following can represents electric power?
Answer» Which unit among the following can represents electric power?

Discussion

48.	What is the speed of light? Can anything else move faster than? Explain.
Answer» What is the speed of light? Can anything else move faster than? Explain.

Discussion

49.	The emitter-base junction of a transistor is ...... biased while the collector-base junction is ....... biased .
Answer» The emitter-base junction of a transistor is ...... biased while the collector-base junction is ....... biased .

Discussion

50.	Why does a current flow when a conductor is connected to a battery?
Answer» Why does a current flow when a conductor is connected to a battery?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Abs refractive index is always&lt;or&gt;then 1?

A refrigerator converts 100 g of water at 20o C to ice at −10o C in 73.5 min. Calculate the average rate of heat extraction in watt. The specific heat capacity of water is 4.2 J g−1K−1, specific latent heat of ice is 336 J g−1 and the specific heat capacity of ice is 2.1 J g−1 K−1.

List the characteristics of refraction of light.

Velocity of a car of mass 2 tonnes is increased from 36 km/hr to 144km/hr and while doing so it covers 100m. Calculate the force applied by its engine.

When an object is placed between F and C of a concave mirror, the image is formed....................

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid : (a) will decrease (b) will increase (c) will become zero (d) will remain the same

Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between

Which of the following is a hydrophilic sol ?

In the figure, a uniform bar of length l m is supported at its ends and loaded by a weight W kgf at its middle. In equilibrium, find the reactions R1 and R2 at the ends.

A catalyst is a substance which [NCERT 1981; CPMT 1996

Why does an electric bulb need to be vacuumed?

What is the significance of building a dam in hydropower plants?

Name the radiations of wavelength just (a) longer than 8×10−7m, (b) shorter than 4×10−7m.

A 1 kg piece of copper is drawn into a wire 1 mm2 thick, and another 1 kg copper piece into a wire, 2 mm2 thick. Compare the resistance of these wires.

What is specifc heat?

Question 1 A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure. The current recorded in the ammeter will be (a) maximum in (i) (b) maximum in (ii) (c) maximum in (iii) (d) the same in all the cases

Can I write x^6+y^6 as (x^3 +y^3) +(x^3+y^3)?

Can you please differentiate between split rings and slip rings..

How is work done by a force measured when the force: i) is in the direction of displacement ii) is at an angle to the direction of displacement

What is the construction of AC Generator?

Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80oC. The mass of the steam condensed in kg is

What should be the angle between force and displacement be to get the 1 minimum work 2 maximum work

Are gases are conductors or insulators? How about ionized gases?

The values of resistances A,B,C are given as 3R,6R ,R voltage is applied across P and Q. Heat energies dissipated ( electrical powers) in A,B,C are a) 2:3:4 b) 2:4:3 c) 4:2:3 d) 3:2:4

Assuming the radius of the earth as R, the change in gravitational potential energy of a body of mass m, where it is taken from the earth's surface to a height 3R above its surface is

Question 8 The major problem in harnessing nuclear energy is how to

The sketches I to IV in Fig. 7.26 show sound waves, all formed in the same time interval. Which diagram shows (i) a note from a musical instrument, (ii) a soft (or feeble) note, (iii) a bass (or low frequency) note.

How does the resistance of the wire depend upon its radius?

What is mean by virutal images

Choose the correct statements about 'Forced vibration':

A bimetallic strip bends on heating due to?

Full explanation on dew point and humidity

What should be the value of x, if voltage drop across x is 1 V.

Why amplitude rises when the frequency of forced vibration matches the natural frequency of a body?

If I completely annihilate a hair of your body that has a mass of 1 μg then how much energy will I get in the process.

Which type of lenses are : (a) thinner in the middle than at the edges ? (b) thicker in the middle than at the edges ?

Which type of mirror could be used as a dentist's mirror ?

A person is standing 1 km away from a source of sound. If the velocity of sound in the medium is 340 ms−1, then calculate the number of oscillations (approximately) that the particles near the source complete before the sound wave reaches that person. The frequency of the sound is 500 Hz.

The slurry left behind in a biogas plant is used for what purpose?

An electric heater of power 3 kW is used for 10 h.How much energy does it consume? Express your answer in (i) kWh, (ii) joule.

Nowadays we are using alternative or non-conventional sources of energy more. Why?

Bacteria produce methane gas in sewage-treatment plants. This gas is often captured or burned. If a bacterial culture produces 60.0 mL of methane gas at 700.0 mm Hg, what volume would be produced at 760.0 mm Hg?

4 identical resistors each of resistance 4 ohm are joined in a circuit .The cell B is of 2v and internal resistance is neglibile Find the current reading of ammeter

Define one coulomb charge.

Which unit among the following can represents electric power?

What is the speed of light? Can anything else move faster than? Explain.

The emitter-base junction of a transistor is ...... biased while the collector-base junction is ....... biased .

Why does a current flow when a conductor is connected to a battery?

Abs refractive index is always<or>then 1?