6277 + Interview Questions in Physics Page 65 InterviewSolution

3201.	Vijay is pushing a block with 22 N force and Gopal is pushing it with 10 N force in the opposite direction. The block moves a distance of 6.5 m in the same direction in which Vijay is pushing it. The work done on the block is:
Answer» Vijay is pushing a block with $22 N$ force and Gopal is pushing it with $10 N$ force in the opposite direction. The block moves a distance of $6.5 m$ in the same direction in which Vijay is pushing it. The work done on the block is:

Discussion

3202.	A particle is moving along a straight line with constant acceleration a. In 5th sec it travels 20 m and at the end of 5th sec its velocity is 30 m/s. What is the acceleration?
Answer» A particle is moving along a straight line with constant acceleration a. In 5th sec it travels 20 m and at the end of 5th sec its velocity is 30 m/s. What is the acceleration?

Discussion

3203.	Identify the energy conversion in an electrical cell.
Answer» Identify the energy conversion in an electrical cell.

Discussion

3204.	If the speed of a vehicle is said to be 50 m/s and the time taken to travel a certain distance is 10 s. Then find the distance traveled?
Answer» If the speed of a vehicle is said to be 50 m/s and the time taken to travel a certain distance is 10 s. Then find the distance traveled?

Discussion

3205.	where does the centre of curvature lie in case of concave mirror?behind itfront of iton the surface nnone
Answer» where does the centre of curvature lie in case of concave mirror? behind it front of it on the surface n none

Discussion

3206.	Which of the following can separate white light into its seven constituent colours?
Answer» Which of the following can separate white light into its seven constituent colours?

Discussion

3207.	Q 1/15 In a potentiometer experiment, a wire oflength 10 m having resistance 2 0/m is connected withof 5 V, 1 Q and an unknown resistor R. If potentialgradient of wire is 2 mV/cm, then value of R is
Answer» Q 1/15 In a potentiometer experiment, a wire oflength 10 m having resistance 2 0/m is connected withof 5 V, 1 Q and an unknown resistor R. If potentialgradient of wire is 2 mV/cm, then value of R is

Discussion

3208.	Oxygen,argon and nitrogen boils at -183 ℃, -185.8 ℃ and -195.8 ℃ respectively. Answer the following questions:(a) Arrange the gasses in the increasing value of boiling point.(b) Which gas liquified first on cooling?(c) Which gas is separated first when the liquid air is warmed up?
Answer» Oxygen,argon and nitrogen boils at -183 ℃, -185.8 ℃ and -195.8 ℃ respectively. Answer the following questions: (a) Arrange the gasses in the increasing value of boiling point. (b) Which gas liquified first on cooling? (c) Which gas is separated first when the liquid air is warmed up?

Discussion

3209.	gibbs free energy represents w(max) in which procez ?
Answer» gibbs free energy represents w(max) in which procez ?

Discussion

3210.	A partical is moving in a circle of radius r having centre at O , with a cons†an t speed V . The magnitude of change in velocity in moving from A to B is
Answer» A partical is moving in a circle of radius r having centre at O , with a cons†an t speed V . The magnitude of change in velocity in moving from A to B is

Discussion

3211.	What is velocity and few examples of it ?
Answer» What is velocity and few examples of it ?

Discussion

3212.	can kinetic friction exist independently
Answer» can kinetic friction exist independently

Discussion

3213.	Distance between the centres of two stars is 10a. The masses of these stars are M and 16M and their radii a and 2a respectively. A body of mass m is fired straight from the surface of the larger star towards the smaller star. What should be its minimum initial speed to reach the surface of the smaller star?
Answer» Distance between the centres of two stars is 10a. The masses of these stars are M and 16M and their radii a and 2a respectively. A body of mass m is fired straight from the surface of the larger star towards the smaller star. What should be its minimum initial speed to reach the surface of the smaller star?

Discussion

3214.	The length of a vertical stick at the surface of a lake appears 12cm to a fish under water. If refractive index of water is 4/3, then actual length of stick above water surface is
Answer» The length of a vertical stick at the surface of a lake appears 12cm to a fish under water. If refractive index of water is 4/3, then actual length of stick above water surface is

Discussion

3215.	The gravitational force between two objects is F. If both of their masses are halved without altering the distance between the objects, the new F would be
Answer» The gravitational force between two objects is F. If both of their masses are halved without altering the distance between the objects, the new F would be

Discussion

3216.	31.Why do like pole repel and unlike pole attract
Answer» 31.Why do like pole repel and unlike pole attract

Discussion

3217.	If the ratio of diameter, length and Young's modulus of steel and copper wire shown in the figure are p,q and s respectively, then the corresponding ratio of increase in their lengths would be(Mass of blocks hanging are 5m and 2m)
Answer» If the ratio of diameter, length and Young's modulus of steel and copper wire shown in the figure are $p, q$ and $s$ respectively, then the corresponding ratio of increase in their lengths would be (Mass of blocks hanging are $5 m$ and $2 m$ )

Discussion

3218.	At what temperature will the reading on the Fahrenheit scale be double of the reading on the Celsius scale?
Answer» At what temperature will the reading on the Fahrenheit scale be double of the reading on the Celsius scale?

Discussion

3219.	Dinesh's village is flooded with water due to heavy rain, so he planned to make a boat for transportation. Which of the following material should he use to make a boat?Glass, wood, marble, rock.
Answer» Dinesh's village is flooded with water due to heavy rain, so he planned to make a boat for transportation. Which of the following material should he use to make a boat? Glass, wood, marble, rock.

Discussion

3220.	Statement 1: Force acting on a body increases its kinetic energy from 200 J to 400 J. Here, this force does positive work on the body. Statement 2: A force does positive work on an object when the displacement is in the direction of the force itself.
Answer» Statement 1: Force acting on a body increases its kinetic energy from 200 J to 400 J. Here, this force does positive work on the body. Statement 2: A force does positive work on an object when the displacement is in the direction of the force itself.

3220.

Statement 1: Force acting on a body increases its kinetic energy from 200 J to 400 J. Here, this force does positive work on the body. Statement 2: A force does positive work on an object when the displacement is in the direction of the force itself.

Answer»

Statement 1: Force acting on a body increases its kinetic energy from 200 J to 400 J. Here, this force does positive work on the body.

Statement 2: A force does positive work on an object when the displacement is in the direction of the force itself.

Discussion

3221.	For a given velocity time graph distplacm ent time graph, speed time graph,acceleration time graph
Answer» For a given velocity time graph distplacm ent time graph, speed time graph,acceleration time graph

Discussion

3222.	Question 28Two women are of the same weight. One wears sandals with pointed heels while the other wears sandals with flat soles. Which one would feel more comfortable while walking on a sandy beach? Give reasons for your answer.
Answer» Question 28 Two women are of the same weight. One wears sandals with pointed heels while the other wears sandals with flat soles. Which one would feel more comfortable while walking on a sandy beach? Give reasons for your answer.

Discussion

3223.	Question 15 Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?
Answer» Question 15 Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?

3223.

Question 15 Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?

Answer»

Question 15

Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?

Discussion

3224.	Question 13 (ii) In the circuit shown in Fig What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?
Answer» Question 13 (ii) In the circuit shown in Fig What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

Discussion

3225.	2.A particle moves along xy plane starting from origin such that instantaneous velocity varies asv(t) -=4j+(12-6t)i, where t in seconds gives v in m/sFind the y co-ordinate when x co-ordinate becomes zero again
Answer» 2.A particle moves along xy plane starting from origin such that instantaneous velocity varies asv(t) -=4j+(12-6t)i, where t in seconds gives v in m/sFind the y co-ordinate when x co-ordinate becomes zero again

Discussion

3226.	displacement of a body is x=5t2+9t ins†an†an eous a
Answer» displacement of a body is x=5t2+9t ins†an†an eous a

Discussion

3227.	If you took a snap of a guy who looks like this using a pinhole camera:How will the image on the screen look like?
Answer» If you took a snap of a guy who looks like this using a pinhole camera: How will the image on the screen look like?

Discussion

3228.	Does a plane mirror and convex mirror form inverted image
Answer» Does a plane mirror and convex mirror form inverted image

Discussion

3229.	what are beats? show analytically how beats are produced due to superposition of twi sound waves. what is the condition for the beats to be audible
Answer» what are beats? show analytically how beats are produced due to superposition of twi sound waves. what is the condition for the beats to be audible

Discussion

3230.	Why are current and voltage in AC resented as phasors?
Answer» Why are current and voltage in AC resented as phasors?

Discussion

3231.	What are the two regions of a shadow?
Answer» What are the two regions of a shadow?

Discussion

3232.	Which of the following type(s) of motion is/are exhibited by a rotating fan?
Answer» Which of the following type(s) of motion is/are exhibited by a rotating fan?

Discussion

3233.	A 6-pole, 50 Hz, three-phase induction motor has rotor resistance and stand still reactance of 0.32 Ω/phase and 3.2 Ω/phase respectively. If starting torque of the motor is 40 N-m, then rotor voltage per phase at standstill is _____V.(Answer upto 2 decimal places)212.43
Answer» A 6-pole, 50 Hz, three-phase induction motor has rotor resistance and stand still reactance of 0.32 $Ω$ /phase and 3.2 $Ω$ /phase respectively. If starting torque of the motor is 40 N-m, then rotor voltage per phase at standstill is _____V.(Answer upto 2 decimal places) 212.43

Discussion

3234.	73. A farmer moves along the boundary of hexagonal field of side 20 metres in 30 seconds what will be the magnitude of displacement of the farmer at the end of 2 minutes and 15 seconds
Answer» 73. A farmer moves along the boundary of hexagonal field of side 20 metres in 30 seconds what will be the magnitude of displacement of the farmer at the end of 2 minutes and 15 seconds

Discussion

3235.	The U-shaped bars in a tuning fork are called as _______.
Answer» The U-shaped bars in a tuning fork are called as _______.

3235.

The U-shaped bars in a tuning fork are called as _______.

Answer»

The U-shaped bars in a tuning fork are called as _______.

Discussion

3236.	Harshit is sitting inside a stationary bus. Which of the following objects will appear to be moving with respect to him?
Answer» Harshit is sitting inside a stationary bus. Which of the following objects will appear to be moving with respect to him?

Discussion

3237.	Question 14Under what conditions permanent electromagnet is obtained if a current carrying solenoid is used? Support your answer with the help of a labelled circuit diagram.
Answer» Question 14 Under what conditions permanent electromagnet is obtained if a current carrying solenoid is used? Support your answer with the help of a labelled circuit diagram.

Discussion

3238.	Draw the circuit diagram to represent the circuitshown infigure.
Answer» Draw the circuit diagram to represent the circuit shown infigure.

3238.

Draw the circuit diagram to represent the circuitshown infigure.

Answer»

Draw the circuit diagram to represent the circuit
shown infigure.

Discussion

3239.	If light slows down by changing medium, what is the need to change direction? Changing direction wont increase(to conserve momentum) Why can't it travel straight?
Answer» If light slows down by changing medium, what is the need to change direction? Changing direction wont increase(to conserve momentum) Why can't it travel straight?

Discussion

3240.	Question 18 In a convex lens, an erect and enlarged image of an object is formed. Explain how this could be possible.
Answer» Question 18 In a convex lens, an erect and enlarged image of an object is formed. Explain how this could be possible.

3240.

Question 18 In a convex lens, an erect and enlarged image of an object is formed. Explain how this could be possible.

Answer»

Question 18

In a convex lens, an erect and enlarged image of an object is formed. Explain how this could be possible.

Discussion

3241.	Explain the following:(a) Why is tungsten used almost exclusively for filament of electric lamps?(b) Why are copper and aluminium wires usually used for electricity transmission?(c)Why is nichrome alloy used for making elements of electric irons?
Answer» Explain the following: (a) Why is tungsten used almost exclusively for filament of electric lamps? (b) Why are copper and aluminium wires usually used for electricity transmission? (c)Why is nichrome alloy used for making elements of electric irons?

Discussion

3242.	Question 7Will the compass needle show deflection when the switch in the circuit shown in the figure is closed?
Answer» Question 7 Will the compass needle show deflection when the switch in the circuit shown in the figure is closed?

Discussion

3243.	The clear sky appears blue because
Answer» The clear sky appears blue because

Discussion

3244.	Adjoining figure shows two blocks A and B pushed against the wall with a force F. The wall is smooth but the surfaces in contact of A and B are rough. Which of the following is true for the system of blocks to be at rest against the wall? 1) F should be more than the weight of A and B 2) F should be equal to the weight of A and B 3) F should be the less than the weight of A and B 4) system cannot be in equilibrium
Answer» Adjoining figure shows two blocks A and B pushed against the wall with a force F. The wall is smooth but the surfaces in contact of A and B are rough. Which of the following is true for the system of blocks to be at rest against the wall? 1) F should be more than the weight of A and B 2) F should be equal to the weight of A and B 3) F should be the less than the weight of A and B 4) system cannot be in equilibrium

Discussion

3245.	The approximate diameter of the Observable Universe is _____ billion light years.93
Answer» The approximate diameter of the Observable Universe is _____ billion light years. 93

Discussion

3246.	A charge particle of charge 5 microcoulomb is placed at origin of XY plane then find the magnitude of electric field at point p .(a) 30cm,40cm
Answer» A charge particle of charge 5 microcoulomb is placed at origin of XY plane then find the magnitude of electric field at point p .(a) 30cm,40cm

Discussion

3247.	In the given figure, AOB represents the path of a light ray. ON is a line perpendicular to the mirror. Select the correct option(s) from the following?
Answer» In the given figure, AOB represents the path of a light ray. ON is a line perpendicular to the mirror. Select the correct option(s) from the following?

3247.

In the given figure, AOB represents the path of a light ray. ON is a line perpendicular to the mirror. Select the correct option(s) from the following?

Answer»

In the given figure, AOB represents the path of a light ray. ON is a line perpendicular to the mirror.

Select the correct option(s) from the following?

Discussion

3248.	Formation of a rainbow is primarily due to ___.
Answer» Formation of a rainbow is primarily due to ___.

Discussion

3249.	Question 30Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.
Answer» Question 30 Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.

Discussion

3250.	15. A ball whose kinetic energy is E ,is projected at an angle 45^° to the horizontal.The kinetic energy of the ball at the highest point of its flight will be (A)E (B)E/2(C)E/2(D)0
Answer» 15. A ball whose kinetic energy is E ,is projected at an angle 45^° to the horizontal.The kinetic energy of the ball at the highest point of its flight will be (A)E (B)E/2(C)E/2(D)0

Discussion

Explore topic-wise InterviewSolutions in .

Vijay is pushing a block with 22 N force and Gopal is pushing it with 10 N force in the opposite direction. The block moves a distance of 6.5 m in the same direction in which Vijay is pushing it. The work done on the block is:

A particle is moving along a straight line with constant acceleration a. In 5th sec it travels 20 m and at the end of 5th sec its velocity is 30 m/s. What is the acceleration?

Identify the energy conversion in an electrical cell.

If the speed of a vehicle is said to be 50 m/s and the time taken to travel a certain distance is 10 s. Then find the distance traveled?

where does the centre of curvature lie in case of concave mirror?behind itfront of iton the surface nnone

Which of the following can separate white light into its seven constituent colours?

Q 1/15 In a potentiometer experiment, a wire oflength 10 m having resistance 2 0/m is connected withof 5 V, 1 Q and an unknown resistor R. If potentialgradient of wire is 2 mV/cm, then value of R is

Oxygen,argon and nitrogen boils at -183 ℃, -185.8 ℃ and -195.8 ℃ respectively. Answer the following questions:(a) Arrange the gasses in the increasing value of boiling point.(b) Which gas liquified first on cooling?(c) Which gas is separated first when the liquid air is warmed up?

gibbs free energy represents w(max) in which procez ?

A partical is moving in a circle of radius r having centre at O , with a cons†an t speed V . The magnitude of change in velocity in moving from A to B is

What is velocity and few examples of it ?

can kinetic friction exist independently

The length of a vertical stick at the surface of a lake appears 12cm to a fish under water. If refractive index of water is 4/3, then actual length of stick above water surface is

The gravitational force between two objects is F. If both of their masses are halved without altering the distance between the objects, the new F would be

31.Why do like pole repel and unlike pole attract

If the ratio of diameter, length and Young's modulus of steel and copper wire shown in the figure are p,q and s respectively, then the corresponding ratio of increase in their lengths would be(Mass of blocks hanging are 5m and 2m)

At what temperature will the reading on the Fahrenheit scale be double of the reading on the Celsius scale?

Dinesh's village is flooded with water due to heavy rain, so he planned to make a boat for transportation. Which of the following material should he use to make a boat?Glass, wood, marble, rock.

Statement 1: Force acting on a body increases its kinetic energy from 200 J to 400 J. Here, this force does positive work on the body. Statement 2: A force does positive work on an object when the displacement is in the direction of the force itself.

For a given velocity time graph distplacm ent time graph, speed time graph,acceleration time graph

Question 28Two women are of the same weight. One wears sandals with pointed heels while the other wears sandals with flat soles. Which one would feel more comfortable while walking on a sandy beach? Give reasons for your answer.

Question 15 Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?

Question 13 (ii) In the circuit shown in Fig What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

2.A particle moves along xy plane starting from origin such that instantaneous velocity varies asv(t) -=4j+(12-6t)i, where t in seconds gives v in m/sFind the y co-ordinate when x co-ordinate becomes zero again

displacement of a body is x=5t2+9t ins†an†an eous a

If you took a snap of a guy who looks like this using a pinhole camera:How will the image on the screen look like?

Does a plane mirror and convex mirror form inverted image

what are beats? show analytically how beats are produced due to superposition of twi sound waves. what is the condition for the beats to be audible

Why are current and voltage in AC resented as phasors?

What are the two regions of a shadow?

Which of the following type(s) of motion is/are exhibited by a rotating fan?

A 6-pole, 50 Hz, three-phase induction motor has rotor resistance and stand still reactance of 0.32 Ω/phase and 3.2 Ω/phase respectively. If starting torque of the motor is 40 N-m, then rotor voltage per phase at standstill is _____V.(Answer upto 2 decimal places)212.43

73. A farmer moves along the boundary of hexagonal field of side 20 metres in 30 seconds what will be the magnitude of displacement of the farmer at the end of 2 minutes and 15 seconds

The U-shaped bars in a tuning fork are called as _______.

Harshit is sitting inside a stationary bus. Which of the following objects will appear to be moving with respect to him?

Question 14Under what conditions permanent electromagnet is obtained if a current carrying solenoid is used? Support your answer with the help of a labelled circuit diagram.

Draw the circuit diagram to represent the circuitshown infigure.

If light slows down by changing medium, what is the need to change direction? Changing direction wont increase(to conserve momentum) Why can't it travel straight?

Question 18 In a convex lens, an erect and enlarged image of an object is formed. Explain how this could be possible.

Explain the following:​(a) Why is tungsten used almost exclusively for filament of electric lamps?(b) Why are copper and aluminium wires usually used for electricity transmission?​(c)Why is nichrome alloy used for making elements of electric irons?

Question 7Will the compass needle show deflection when the switch in the circuit shown in the figure is closed?

The clear sky appears blue because

The approximate diameter of the Observable Universe is _____ billion light years.93

A charge particle of charge 5 microcoulomb is placed at origin of XY plane then find the magnitude of electric field at point p .(a) 30cm,40cm

In the given figure, AOB represents the path of a light ray. ON is a line perpendicular to the mirror. Select the correct option(s) from the following?

Formation of a rainbow is primarily due to ___.

Question 30Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.

15. A ball whose kinetic energy is E ,is projected at an angle 45^° to the horizontal.The kinetic energy of the ball at the highest point of its flight will be (A)E (B)E/2(C)E/2(D)0

Explain the following:(a) Why is tungsten used almost exclusively for filament of electric lamps?(b) Why are copper and aluminium wires usually used for electricity transmission?(c)Why is nichrome alloy used for making elements of electric irons?