13232 + Interview Questions in Physics Page 175 InterviewSolution

8701.	Suppose that a box is accelerating at a rate of 2ms−2. If the net force is tripled and the mass is doubled, then what is the new acceleration of the box?
Answer» Suppose that a box is accelerating at a rate of $2 m s^{- 2}$ . If the net force is tripled and the mass is doubled, then what is the new acceleration of the box?

Discussion

8702.	Which of the following remains unchanged when a sound wave travels from air to water?
Answer» Which of the following remains unchanged when a sound wave travels from air to water?

Discussion

8703.	Why does concave mirror always makes an inverted image, why not the plane mirror or the convex mirror?
Answer» Why does concave mirror always makes an inverted image, why not the plane mirror or the convex mirror?

Discussion

8704.	What stops the pendulum eventually after some time
Answer» What stops the pendulum eventually after some time

Discussion

8705.	In a hydroelectric power plant, more electrical power can be generated if water falls from a greater height because:
Answer» In a hydroelectric power plant, more electrical power can be generated if water falls from a greater height because:

Discussion

8706.	According to the passage, states of power are transient because of the:
Answer» According to the passage, states of power are transient because of the:

Discussion

8707.	If the true value for a result is 3.00 m and a student records two readings as 3.01 m and 2.99 m, then we can conclude that:
Answer» If the true value for a result is 3.00 m and a student records two readings as 3.01 m and 2.99 m, then we can conclude that:

Discussion

8708.	Sound follow laws of reflection.
Answer» Sound follow laws of reflection.

Discussion

8709.	Calculate the pressure produced by a force of 1200N acting on an area of 4.0 cm²
Answer» Calculate the pressure produced by a force of 1200N acting on an area of 4.0 cm²

Discussion

8710.	Karan wants to create an electric circuit for his science project and he bought some copper wire to connect at the terminals of an electric cell. But he does not know how many terminals an electric cell has. Can you tell?
Answer» Karan wants to create an electric circuit for his science project and he bought some copper wire to connect at the terminals of an electric cell. But he does not know how many terminals an electric cell has. Can you tell?

Discussion

8711.	Sir/Mam following is my question : When a force acting on a body has equal and opposite reaction, then why should the body move at all? Pls help me solve this question. Thnx
Answer» Sir/Mam following is my question : When a force acting on a body has equal and opposite reaction, then why should the body move at all? Pls help me solve this question. Thnx

8711.

Sir/Mam following is my question : When a force acting on a body has equal and opposite reaction, then why should the body move at all? Pls help me solve this question. Thnx

Answer»

Sir/Mam following is my question :

When a force acting on a body has equal and opposite reaction, then why should the body move at all?

Pls help me solve this question.

Thnx

Discussion

8712.	convert 100 cal into joules
Answer» _{convert 100 cal into joules}

Discussion

8713.	Calorie is the unit of : (a) heat (b) work (c) temperature (d) food
Answer» Calorie is the unit of : (a) heat (b) work (c) temperature (d) food

8713.

Calorie is the unit of : (a) heat (b) work (c) temperature (d) food

Answer»

Calorie is the unit of :

(a) heat (b) work

(c) temperature (d) food

Discussion

8714.	Similar poles ___ each other.
Answer» Similar poles ___ each other.

Discussion

8715.	A body weighs 40 gf in air, 36.4 gf in liquid and 36 gf in water. Calculate relative density of the body.
Answer» A body weighs 40 gf in air, 36.4 gf in liquid and 36 gf in water. Calculate relative density of the body.

Discussion

8716.	Which of the following processes produces electricity in the electric cell?
Answer» Which of the following processes produces electricity in the electric cell?

Discussion

8717.	Three particles each of mass 'm', are placed at the corners of an equilateral triangle of side 'a', as shown in Figure. The position vector of the centre of mass is
Answer» Three particles each of mass 'm', are placed at the corners of an equilateral triangle of side 'a', as shown in Figure. The position vector of the centre of mass is

Discussion

8718.	Question 4 Two objects of masses 100 g and 200 g are moving along the same line and direction with velocities of 2 ms−1 and 1 ms−1, respectively. They collide and after the collision, the first object moves at a velocity of 1.67 ms−1. Determine the velocity of the second object.
Answer» Question 4 Two objects of masses 100 g and 200 g are moving along the same line and direction with velocities of $2 m s^{- 1} a n d 1 m s^{- 1},$ respectively. They collide and after the collision, the first object moves at a velocity of $1.67 m s^{- 1}$ . Determine the velocity of the second object.

Discussion

8719.	Which of the following is a non-metric unit for weight?
Answer» Which of the following is a non-metric unit for weight?

Discussion

8720.	The process of determination of distance of target on the basis of time interval between the moment an ultrasonic impulse is transmitted and the moment its echo is received is called as:
Answer» The process of determination of distance of target on the basis of time interval between the moment an ultrasonic impulse is transmitted and the moment its echo is received is called as:

Discussion

8721.	A train starting from a railway station and moving with uniform acceleration attains a speed of 40 km /hr in 10 min. Find its acceleration.
Answer» A train starting from a railway station and moving with uniform acceleration attains a speed of 40 km /hr in 10 min. Find its acceleration.

Discussion

8722.	Q56. Which of the following initiatives is/are related to Green Building Rating? 1. GRIHA 2. ECBC 2017 3. LEED for cities Which of the above statement(s) is/are correct?
Answer» Q56. Which of the following initiatives is/are related to Green Building Rating? 1. GRIHA 2. ECBC 2017 3. LEED for cities Which of the above statement(s) is/are correct?

8722.

Q56. Which of the following initiatives is/are related to Green Building Rating? 1. GRIHA 2. ECBC 2017 3. LEED for cities Which of the above statement(s) is/are correct?

Answer»

Q56. Which of the following initiatives is/are related to Green Building Rating?

1. GRIHA 2. ECBC 2017

3. LEED for cities

Which of the above statement(s) is/are correct?

Discussion

8723.	Resistors R1, R2 and R3 having values 5Ω, 10Ω, and 30Ω respectively are connected in parallel across a battery of 12V. Calculate [3 MARKS] (a) the current through each resistor (b) the total current in the circuit and (c) the total circuit resistance.
Answer» Resistors $R_{1}$ , $R_{2}$ and $R_{3}$ having values 5 $Ω$ , 10 $Ω$ , and 30 $Ω$ respectively are connected in parallel across a battery of 12V. Calculate [3 MARKS] (a) the current through each resistor (b) the total current in the circuit and (c) the total circuit resistance.

8723.

Resistors R1, R2 and R3 having values 5Ω, 10Ω, and 30Ω respectively are connected in parallel across a battery of 12V. Calculate [3 MARKS] (a) the current through each resistor (b) the total current in the circuit and (c) the total circuit resistance.

Answer»

Resistors $R_{1}$ , $R_{2}$ and $R_{3}$ having values 5 $Ω$ , 10 $Ω$ , and 30 $Ω$ respectively are connected in parallel across a battery of 12V. Calculate [3 MARKS]

(a) the current through each resistor

(b) the total current in the circuit and

(c) the total circuit resistance.

Discussion

8724.	Question 24 Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. (a) How much work is done by the men in lifting the box? (b) How much work do they do in just holding it? (c) Why do they get tired while holding it? (g=10ms−2)
Answer» Question 24 Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. (a) How much work is done by the men in lifting the box? (b) How much work do they do in just holding it? (c) Why do they get tired while holding it? $(g = 10 m s^{- 2})$

Discussion

8725.	Question 14 (i) Compare the power used in the 2Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1Ω and 2Ω resistors.
Answer» Question 14 (i) Compare the power used in the $2 Ω$ resistor in each of the following circuits: (i) a 6 V battery in series with $1 Ω$ and $2 Ω$ resistors.

Discussion

8726.	If two horse shoe magnets of equal strengths are connected as shown in the figure then where will be the new magnetic north-pole?
Answer» If two horse shoe magnets of equal strengths are connected as shown in the figure then where will be the new magnetic north-pole?

8726.

If two horse shoe magnets of equal strengths are connected as shown in the figure then where will be the new magnetic north-pole?

Answer»

If two horse shoe magnets of equal strengths are connected as shown in the figure then where will be the new magnetic north-pole?

Discussion

8727.	A car moves with a constant speed of 10 m s−1 in a circular path of radius 10 m. The mass of the car is 1000 kg. The centripetal force for the car is:
Answer» A car moves with a constant speed of $10 {m s}^{- 1}$ in a circular path of radius $10 m$ . The mass of the car is $1000 kg$ . The centripetal force for the car is:

Discussion

8728.	A boy standing in a bus is thrown towards the rear of the bus as it begins to move, and to the front when it slows down. Why does this happen? [2 MARKS]
Answer» A boy standing in a bus is thrown towards the rear of the bus as it begins to move, and to the front when it slows down. Why does this happen? [2 MARKS]

Discussion

8729.	Calculate the work done by q student in lifting a 0.5 kg book from the ground and keeping it on a shelf 1.5 m high.
Answer» Calculate the work done by q student in lifting a 0.5 kg book from the ground and keeping it on a shelf 1.5 m high.

Discussion

8730.	From a waterfall, water pours down at the rate of 100 kgs−1 on the blades of a turbine. If the height of the fall is 120 m, calculate the power delivered to the turbine? (Given g=10 ms−2)
Answer» From a waterfall, water pours down at the rate of $100 k g s^{- 1}$ on the blades of a turbine. If the height of the fall is 120 m, calculate the power delivered to the turbine? (Given $g = 10 m s^{- 2}$ )

Discussion

8731.	In which direction does the buoyant force act (if the weight is acting downwards)?
Answer» In which direction does the buoyant force act (if the weight is acting downwards)?

Discussion

8732.	A person shouts near a wall and heard the echo after 10 sec. What is the distance of the wall from the person? (take speed of sound=346 ms−1) [2 MARKS]
Answer» A person shouts near a wall and heard the echo after 10 sec. What is the distance of the wall from the person? (take speed of sound= $346 m s^{- 1}$ ) [2 MARKS]

Discussion

8733.	There are two mutual perpendicular forces acting on an object. One force acts in the direction of motion of the object and other is perpendicular to the motion. During this interval, the kinetic energy of the body changes from 25 J to 100 J. The work done by the force acting perpendicular to the direction of the object is:
Answer» There are two mutual perpendicular forces acting on an object. One force acts in the direction of motion of the object and other is perpendicular to the motion. During this interval, the kinetic energy of the body changes from 25 J to 100 J. The work done by the force acting perpendicular to the direction of the object is:

Discussion

8734.	Which of these is the correct process of manufacturing bio gas?
Answer» Which of these is the correct process of manufacturing bio gas?

Discussion

8735.	An iron nail sinks in water but it floats in mercury. Why?
Answer» An iron nail sinks in water but it floats in mercury. Why?

Discussion

8736.	A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain ? (g = 9.8 m/s2).
Answer» A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain ? (g = 9.8 $m / s^{2}$ ).

Discussion

8737.	Is our weight zero when we are going down in an escalator.If yes ,why?
Answer» Is our weight zero when we are going down in an escalator.If yes ,why?

Discussion

8738.	Give an example of an object which experiences a net zero external unbalanced force but moves with a non-zero velocity
Answer» Give an example of an object which experiences a net zero external unbalanced force but moves with a non-zero velocity

Discussion

8739.	Differentiate between average speed and average velocity.
Answer» Differentiate between average speed and average velocity.

Discussion

8740.	Ifvwe touch a plasma ball with our hand we feel nothing,but when touched by keeping an aluminum foil over the ball we feel an electric shock. Why?
Answer» Ifvwe touch a plasma ball with our hand we feel nothing,but when touched by keeping an aluminum foil over the ball we feel an electric shock. Why?

Discussion

8741.	Man walks in a straight road from his home to a market 2.5 km away with a speed of 5 km per hour finding the market closed he instantly turn and walked back to home with a speed of 7.5 km per hour the average speed of an over the interval of zero to 40 minute is equal to.
Answer» Man walks in a straight road from his home to a market 2.5 km away with a speed of 5 km per hour finding the market closed he instantly turn and walked back to home with a speed of 7.5 km per hour the average speed of an over the interval of zero to 40 minute is equal to.

Discussion

8742.	under what conditions would the speed of a body be equal to the magnitude of velocity
Answer» under what conditions would the speed of a body be equal to the magnitude of velocity

Discussion

8743.	Which one has more inertia a cricket ball or a rubber ball of same size give reason
Answer» Which one has more inertia a cricket ball or a rubber ball of same size give reason

Discussion

8744.	Can the train appear to be at rest while moving justify
Answer» Can the train appear to be at rest while moving justify

Discussion

8745.	A bulb lights up when connected to a battery. State the energy change which takes place : (i) in the battery. (ii) in the bulb.
Answer» A bulb lights up when connected to a battery. State the energy change which takes place : (i) in the battery. (ii) in the bulb.

8745.

A bulb lights up when connected to a battery. State the energy change which takes place : (i) in the battery. (ii) in the bulb.

Answer»

A bulb lights up when connected to a battery. State the energy change which takes place :

(i) in the battery.

(ii) in the bulb.

Discussion

8746.	The properties of ultrasound that make it useful, are : (a) high power and high speed (b) high power and good directivity (c) high frequency and high speed (d) high frequency and bending around the objects.
Answer» The properties of ultrasound that make it useful, are : (a) high power and high speed (b) high power and good directivity (c) high frequency and high speed (d) high frequency and bending around the objects.

8746.

The properties of ultrasound that make it useful, are : (a) high power and high speed (b) high power and good directivity (c) high frequency and high speed (d) high frequency and bending around the objects.

Answer»

The properties of ultrasound that make it useful, are :

(a) high power and high speed

(b) high power and good directivity

(c) high frequency and high speed

(d) high frequency and bending around the objects.

Discussion

8747.	Which of the following is a unit of time?
Answer» Which of the following is a unit of time?

Discussion

8748.	A hockey ball of mass 200 gram travelling at 10 m/s is struck by a hockey stick so as to return it along with original path with a velocity at 5 m/s . Calculate the change of momentum Orchid in the motion of the hockey Ball by the force applied by the hockey stick. How did the change of momentum have postive sign?
Answer» A hockey ball of mass 200 gram travelling at 10 m/s is struck by a hockey stick so as to return it along with original path with a velocity at 5 m/s . Calculate the change of momentum Orchid in the motion of the hockey Ball by the force applied by the hockey stick. How did the change of momentum have postive sign?

8748.

A hockey ball of mass 200 gram travelling at 10 m/s is struck by a hockey stick so as to return it along with original path with a velocity at 5 m/s . Calculate the change of momentum Orchid in the motion of the hockey Ball by the force applied by the hockey stick. How did the change of momentum have postive sign?

Answer»

A hockey ball of mass 200 gram travelling at 10 m/s is struck by a hockey stick so as to return it along with original path with a velocity at 5 m/s . Calculate the change of momentum Orchid in the motion of the hockey Ball by the force applied by the hockey stick.

How did the change of momentum have postive sign?

Discussion

8749.	DIFFERENCE between LOUDNESS and INTENCITY of the SOUND ??
Answer» DIFFERENCE between LOUDNESS and INTENCITY of the SOUND ??

Discussion

8750.	Archimedes principle states which of the following points?
Answer» Archimedes principle states which of the following points?

Discussion

Explore topic-wise InterviewSolutions in .

Suppose that a box is accelerating at a rate of 2ms−2. If the net force is tripled and the mass is doubled, then what is the new acceleration of the box?

Which of the following remains unchanged when a sound wave travels from air to water?

Why does concave mirror always makes an inverted image, why not the plane mirror or the convex mirror?

What stops the pendulum eventually after some time

In a hydroelectric power plant, more electrical power can be generated if water falls from a greater height because:

According to the passage, states of power are transient because of the:

If the true value for a result is 3.00 m and a student records two readings as 3.01 m and 2.99 m, then we can conclude that:

Sound follow laws of reflection.

Calculate the pressure produced by a force of 1200N acting on an area of 4.0 cm²

Karan wants to create an electric circuit for his science project and he bought some copper wire to connect at the terminals of an electric cell. But he does not know how many terminals an electric cell has. Can you tell?

Sir/Mam following is my question : When a force acting on a body has equal and opposite reaction, then why should the body move at all? Pls help me solve this question. Thnx

convert 100 cal into joules

Calorie is the unit of : (a) heat (b) work (c) temperature (d) food

Similar poles ___ each other.

A body weighs 40 gf in air, 36.4 gf in liquid and 36 gf in water. Calculate relative density of the body.

Which of the following processes produces electricity in the electric cell?

Three particles each of mass 'm', are placed at the corners of an equilateral triangle of side 'a', as shown in Figure. The position vector of the centre of mass is

Question 4 Two objects of masses 100 g and 200 g are moving along the same line and direction with velocities of 2 ms−1 and 1 ms−1, respectively. They collide and after the collision, the first object moves at a velocity of 1.67 ms−1. Determine the velocity of the second object.

Which of the following is a non-metric unit for weight?

The process of determination of distance of target on the basis of time interval between the moment an ultrasonic impulse is transmitted and the moment its echo is received is called as:

A train starting from a railway station and moving with uniform acceleration attains a speed of 40 km /hr in 10 min. Find its acceleration.

Q56. Which of the following initiatives is/are related to Green Building Rating? 1. GRIHA 2. ECBC 2017 3. LEED for cities Which of the above statement(s) is/are correct?

Resistors R1, R2 and R3 having values 5Ω, 10Ω, and 30Ω respectively are connected in parallel across a battery of 12V. Calculate [3 MARKS] (a) the current through each resistor (b) the total current in the circuit and (c) the total circuit resistance.

Question 24 Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. (a) How much work is done by the men in lifting the box? (b) How much work do they do in just holding it? (c) Why do they get tired while holding it? (g=10ms−2)

Question 14 (i) Compare the power used in the 2Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1Ω and 2Ω resistors.

If two horse shoe magnets of equal strengths are connected as shown in the figure then where will be the new magnetic north-pole?

A car moves with a constant speed of 10 m s−1 in a circular path of radius 10 m. The mass of the car is 1000 kg. The centripetal force for the car is:

A boy standing in a bus is thrown towards the rear of the bus as it begins to move, and to the front when it slows down. Why does this happen? [2 MARKS]

Calculate the work done by q student in lifting a 0.5 kg book from the ground and keeping it on a shelf 1.5 m high.

From a waterfall, water pours down at the rate of 100 kgs−1 on the blades of a turbine. If the height of the fall is 120 m, calculate the power delivered to the turbine? (Given g=10 ms−2)

In which direction does the buoyant force act (if the weight is acting downwards)?

A person shouts near a wall and heard the echo after 10 sec. What is the distance of the wall from the person? (take speed of sound=346 ms−1) [2 MARKS]

Which of these is the correct process of manufacturing bio gas?

An iron nail sinks in water but it floats in mercury. Why?

A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain ? (g = 9.8 m/s2).

Is our weight zero when we are going down in an escalator.If yes ,why?

Give an example of an object which experiences a net zero external unbalanced force but moves with a non-zero velocity

Differentiate between average speed and average velocity.

Ifvwe touch a plasma ball with our hand we feel nothing,but when touched by keeping an aluminum foil over the ball we feel an electric shock. Why?

Man walks in a straight road from his home to a market 2.5 km away with a speed of 5 km per hour finding the market closed he instantly turn and walked back to home with a speed of 7.5 km per hour the average speed of an over the interval of zero to 40 minute is equal to.

under what conditions would the speed of a body be equal to the magnitude of velocity

Which one has more inertia a cricket ball or a rubber ball of same size give reason

Can the train appear to be at rest while moving justify

A bulb lights up when connected to a battery. State the energy change which takes place : (i) in the battery. (ii) in the bulb.

The properties of ultrasound that make it useful, are : (a) high power and high speed (b) high power and good directivity (c) high frequency and high speed (d) high frequency and bending around the objects.

Which of the following is a unit of time?

DIFFERENCE between LOUDNESS and INTENCITY of the SOUND ??

Archimedes principle states which of the following points?