13232 + Interview Questions in Physics Page 193 InterviewSolution

9601.	The odometer of a car reads 2000 km at the start of a trip. And at the end it reads 2400 km. If the trip took 8 hours, find the average velocity in km/hour and m/second.
Answer» The odometer of a car reads 2000 km at the start of a trip. And at the end it reads 2400 km. If the trip took 8 hours, find the average velocity in km/hour and m/second.

Discussion

9602.	The ultrasound waves can penetrate into matter to a large extent because they have : (a) very high speed (b) very high frequency (c) very high wavelength (d) very high amplitude
Answer» The ultrasound waves can penetrate into matter to a large extent because they have : (a) very high speed (b) very high frequency (c) very high wavelength (d) very high amplitude

9602.

The ultrasound waves can penetrate into matter to a large extent because they have : (a) very high speed (b) very high frequency (c) very high wavelength (d) very high amplitude

Answer»

The ultrasound waves can penetrate into matter to a large extent because they have :

(a) very high speed

(b) very high frequency

(c) very high wavelength

(d) very high amplitude

Discussion

9603.	If a body covers first half of its journey with uniform speed V1 and the second half of the journey with uniform speed V2 then the average speed is
Answer» If a body covers first half of its journey with uniform speed V1 and the second half of the journey with uniform speed V2 then the average speed is

Discussion

9604.	6.7 into 10 power Minus 11into six into 10 power 24 KG into 7.4 into 10 power 22 KG by 3.84 into 10 power 8 m whole square
Answer» 6.7 into 10 power Minus 11into six into 10 power 24 KG into 7.4 into 10 power 22 KG by 3.84 into 10 power 8 m whole square

Discussion

9605.	Obtain an expresion for acceleration due to gravity and justify that all object hollow orsolid ,big or small fall from a height at same rate in vacuum.
Answer» Obtain an expresion for acceleration due to gravity and justify that all object hollow orsolid ,big or small fall from a height at same rate in vacuum.

Discussion

9606.	A cyclist is traveling at 15m/sec. She applies brakes so that she does not collide with a wall 18 metre away. What deacceleration must she have?
Answer» A cyclist is traveling at 15m/sec. She applies brakes so that she does not collide with a wall 18 metre away. What deacceleration must she have?

Discussion

9607.	State two factors on which power spent by a source depends.Explain your answer with examples.
Answer» State two factors on which power spent by a source depends.Explain your answer with examples.

Discussion

9608.	Difference between balanced and unbalanced force.
Answer» Difference between balanced and unbalanced force.

Discussion

9609.	Mass m2 is hanging by a string that passes over a pulley and is connected to a block of mass m1 kept on a friction less surface. Find the minimum mass of m2 for the system to move
Answer» Mass $m_{2}$ is hanging by a string that passes over a pulley and is connected to a block of mass $m_{1}$ kept on a friction less surface. Find the minimum mass of $m_{2}$ for the system to move

9609.

Mass m2 is hanging by a string that passes over a pulley and is connected to a block of mass m1 kept on a friction less surface. Find the minimum mass of m2 for the system to move

Answer»

Mass $m_{2}$ is hanging by a string that passes over a pulley and is connected to a block of mass $m_{1}$ kept on a friction less surface. Find the minimum mass of $m_{2}$ for the system to move

Discussion

9610.	Why do camesl have large flat feet?
Answer» Why do camesl have large flat feet?

9610.

Why do camesl have large flat feet?

Answer»

Why do camesl have large flat feet?

Discussion

9611.	Which of the following is correct about work for an object of mass ′m′ displaced vertically by a distance of ′h′?
Answer» Which of the following is correct about work for an object of mass $^{'} m^{'}$ displaced vertically by a distance of $^{'} h^{'} ?$

Discussion

9612.	Why cant humans hear ultrasonic sounds?
Answer» Why cant humans hear ultrasonic sounds?

Discussion

9613.	A solid of mass 22 kg is immersed in water. If it loses half of its weight in water, its R.D. will be
Answer» A solid of mass 22 kg is immersed in water. If it loses half of its weight in water, its R.D. will be

Discussion

9614.	A pendulum makes 135 oscillations in a duration of 15 seconds. The time period of the pendulum is .
Answer» A pendulum makes 135 oscillations in a duration of 15 seconds. The time period of the pendulum is .

Discussion

9615.	Seven homogeneous bricks, each of length L, are arranged as shown in figure (9.E2). Each brick is displaced with respect to the one in contact by L10. Find the x-coordinate of the centre of mass relative to the origin shown.
Answer» Seven homogeneous bricks, each of length L, are arranged as shown in figure (9.E2). Each brick is displaced with respect to the one in contact by $\frac{L}{10}$ . Find the x-coordinate of the centre of mass relative to the origin shown.

Discussion

9616.	State Newton's law of universal gravitation.
Answer» State Newton's law of universal gravitation.

Discussion

9617.	The charge on an electron is known to be 1.6×10−19 C. In a circuit, the current flowing is 1 A. How many electrons will be flowing through the circuit per second?
Answer» The charge on an electron is known to be $1.6 \times 10^{- 19}$ C. In a circuit, the current flowing is 1 A. How many electrons will be flowing through the circuit per second?

Discussion

9618.	Compare a natural magnet and an electromagnet. Explain the term electric cell and switch.
Answer» Compare a natural magnet and an electromagnet. Explain the term electric cell and switch.

Discussion

9619.	Name the characteristic which helps us distinguish between a man's voice and a woman's voice, without seeing them.
Answer» Name the characteristic which helps us distinguish between a man's voice and a woman's voice, without seeing them.

Discussion

9620.	what is the difference between thrust and pressure?
Answer» what is the difference between thrust and pressure?

Discussion

9621.	If magnetic needle does not deflect, and LED or bulb also does not glow while testing a solution for electrical conductivity, it might imply:
Answer» If magnetic needle does not deflect, and LED or bulb also does not glow while testing a solution for electrical conductivity, it might imply:

Discussion

9622.	Two rods A and B of different materials are welded together as shown in the figure. If their thermal conductivities are k1 and k2, the thermal conductivity of the composite rod will be
Answer» Two rods A and B of different materials are welded together as shown in the figure. If their thermal conductivities are $k_{1}$ and $k_{2}$ , the thermal conductivity of the composite rod will be

Discussion

9623.	Density is a___ quantity. (scalar/vector)
Answer» Density is a___ quantity. (scalar/vector)

Discussion

9624.	Which of the following frequency is an ultrasonic sound?
Answer» Which of the following frequency is an ultrasonic sound?

Discussion

9625.	Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames and comparatively smokeless and has higher heat generation.
Answer» Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames and comparatively smokeless and has higher heat generation.

Discussion

9626.	What physical quantity does the slope of a S-T graph represent
Answer» What physical quantity does the slope of a S-T graph represent

Discussion

9627.	What is a magnetic field?
Answer» What is a magnetic field?

Discussion

9628.	Question 8 The weight of 72 books is 9kg. What is the weight of 40 such books?
Answer» Question 8 The weight of 72 books is 9kg. What is the weight of 40 such books?

9628.

Question 8 The weight of 72 books is 9kg. What is the weight of 40 such books?

Answer»

Question 8

The weight of 72 books is 9kg. What is the weight of 40 such books?

Discussion

9629.	What is the range of frequencies associated with (a) infrasound (b) audible sound, and (c) ultrasound ?
Answer» What is the range of frequencies associated with (a) infrasound (b) audible sound, and (c) ultrasound ?

Discussion

9630.	Name and state the principle on which a hydraulic press works. Write one use of the hydraulic press.
Answer» Name and state the principle on which a hydraulic press works. Write one use of the hydraulic press.

Discussion

9631.	1 J equals to : (a) 0.24 cal (b) 4.18 cal (c) 1 cal (d) 1 kcal
Answer» 1 J equals to : (a) 0.24 cal (b) 4.18 cal (c) 1 cal (d) 1 kcal

9631.

1 J equals to : (a) 0.24 cal (b) 4.18 cal (c) 1 cal (d) 1 kcal

Answer»

1 J equals to :

(a) 0.24 cal (b) 4.18 cal

(c) 1 cal (d) 1 kcal

Discussion

9632.	Statement I: Fossil fuels are renewable source of energy. Statement II: Renewable sources are collected from resources which are naturally replenished on a human timescale, such as sunlight, the wind, rain, tides, waves, and geothermal heat.
Answer» Statement I: Fossil fuels are renewable source of energy. Statement II: Renewable sources are collected from resources which are naturally replenished on a human timescale, such as sunlight, the wind, rain, tides, waves, and geothermal heat.

Discussion

9633.	In the case of a moving body, force is not needed
Answer» In the case of a moving body, force is not needed

Discussion

9634.	It took 2s after lightening for the sound of thunder to reach you,how far did the lightening struck ?
Answer» It took 2s after lightening for the sound of thunder to reach you,how far did the lightening struck ?

Discussion

9635.	A cubical body of mass 5kg and side of length 20 cm is half immersed in a liquid .find the magnitude of upthrust on it.taking g=10m/s2
Answer» A cubical body of mass 5kg and side of length 20 cm is half immersed in a liquid .find the magnitude of upthrust on it.taking g=10m/s2

Discussion

9636.	If an object is in motion in a straight line the magnitude of speedbis it's velocity?
Answer» If an object is in motion in a straight line the magnitude of speedbis it's velocity?

Discussion

9637.	A sound signal of 128 vibrations per seconds has a wavelength of 2.7m . Calculate the speed with which the wave travels.
Answer» A sound signal of 128 vibrations per seconds has a wavelength of 2.7m . Calculate the speed with which the wave travels.

Discussion

9638.	The SI unit of acceleration is________.
Answer» The SI unit of acceleration is________.

Discussion

9639.	A car accelerates uniformly from 18 km hr-1 to 36 km hr-1 in 5 seconds. Find A) Acceleration B) Distance travelled
Answer» A car accelerates uniformly from 18 km hr^-1to 36 km hr^-1in 5 seconds. Find A) Acceleration B) Distance travelled

9639.

A car accelerates uniformly from 18 km hr-1 to 36 km hr-1 in 5 seconds. Find A) Acceleration B) Distance travelled

Answer»

A car accelerates uniformly from 18 km hr^-1to 36 km hr^-1in 5 seconds. Find

A) Acceleration

B) Distance travelled

Discussion

9640.	How does a karate player break a slab of ice with a single blow?
Answer» How does a karate player break a slab of ice with a single blow?

Discussion

9641.	Person a drops a ball and calculates the time to hit the ground in his science lab and another person is trying the same thing in an elevator which is going up at the velocity of 10 M per second. Who will note the more time for the ball to reach the ground?
Answer» Person a drops a ball and calculates the time to hit the ground in his science lab and another person is trying the same thing in an elevator which is going up at the velocity of 10 M per second. Who will note the more time for the ball to reach the ground?

Discussion

9642.	At a distance of 400m from a traffic signal, brakes are applied to a locomotive to produce an retardation of 0.3m/s^2. Initial velocity of the locomotive is 54 km/hr. Determine the position of the locomotive with respect to the traffic light after the application of brakes for 1 min.
Answer» At a distance of 400m from a traffic signal, brakes are applied to a locomotive to produce an retardation of 0.3m/s^2. Initial velocity of the locomotive is 54 km/hr. Determine the position of the locomotive with respect to the traffic light after the application of brakes for 1 min.

Discussion

9643.	A 40 KG SHELL IS MOVING WITH A VELOCITY OF 72 KM/HR. IT EXPLODES INTO TWO PIECES. ONE PIECE OF MASS 15 KG STOPS . CALCULATE THE VELOCITY OF THE OTHER ONE. PS.FROM MY REVISION WORKSHEET
Answer» A 40 KG SHELL IS MOVING WITH A VELOCITY OF 72 KM/HR. IT EXPLODES INTO TWO PIECES. ONE PIECE OF MASS 15 KG STOPS . CALCULATE THE VELOCITY OF THE OTHER ONE. PS.FROM MY REVISION WORKSHEET

Discussion

9644.	If a person drops a pebble in a well of 100 m depth, after how much time (in seconds) will he be able to hear the sound? Given: Acceleration due to gravity, g=10 ms−2 Speed of sound in air, v=343 ms−1
Answer» If a person drops a pebble in a well of $100 m$ depth, after how much time (in seconds) will he be able to hear the sound? Given: Acceleration due to gravity, $g = 10 m s^{- 2}$ Speed of sound in air, $v = 343 m s^{- 1}$

Discussion

9645.	What is acceleration?
Answer» What is acceleration?

Discussion

9646.	Velocity-time graph for the uniform accelerated motions of two objects P and Q are shown in figure I and II respectively: (i) Which object starts from rest? (ii) Which object P and Q has more velocity after 5 second?
Answer» Velocity-time graph for the uniform accelerated motions of two objects P and Q are shown in figure I and II respectively: (i) Which object starts from rest? (ii) Which object P and Q has more velocity after 5 second?

9646.

Velocity-time graph for the uniform accelerated motions of two objects P and Q are shown in figure I and II respectively: (i) Which object starts from rest? (ii) Which object P and Q has more velocity after 5 second?

Answer»

Velocity-time graph for the uniform accelerated motions of two objects P and Q are shown in figure I and II respectively:

(i) Which object starts from rest?

(ii) Which object P and Q has more velocity after 5 second?

Discussion

9647.	What is represented by the area under acceleration time graph?
Answer» What is represented by the area under acceleration time graph?

Discussion

9648.	An effort of 240 N overcome a useful load 1000 N when applied to a block and system of pulleys; such that the weight of movable block and friction is 220 N. What is the efficiency of the system?
Answer» An effort of $240 N$ overcome a useful load $1000 N$ when applied to a block and system of pulleys; such that the weight of movable block and friction is $220 N$ . What is the efficiency of the system?

Discussion

9649.	Two planets of radii r1 and r2 are made from the same material. The ratio of the acceleration due to gravity g1g2 at the surface of the two planets is:
Answer» Two planets of radii $r_{1}$ and $r_{2}$ are made from the same material. The ratio of the acceleration due to gravity $\frac{g_{1}}{g_{2}}$ at the surface of the two planets is:

Discussion

9650.	Which of the following is/are correct?
Answer» Which of the following is/are correct?

Discussion

Explore topic-wise InterviewSolutions in .

The odometer of a car reads 2000 km at the start of a trip. And at the end it reads 2400 km. If the trip took 8 hours, find the average velocity in km/hour and m/second.

The ultrasound waves can penetrate into matter to a large extent because they have : (a) very high speed (b) very high frequency (c) very high wavelength (d) very high amplitude

If a body covers first half of its journey with uniform speed V1 and the second half of the journey with uniform speed V2 then the average speed is

6.7 into 10 power Minus 11into six into 10 power 24 KG into 7.4 into 10 power 22 KG by 3.84 into 10 power 8 m whole square

Obtain an expresion for acceleration due to gravity and justify that all object hollow orsolid ,big or small fall from a height at same rate in vacuum.

A cyclist is traveling at 15m/sec. She applies brakes so that she does not collide with a wall 18 metre away. What deacceleration must she have?

State two factors on which power spent by a source depends.Explain your answer with examples.

Difference between balanced and unbalanced force.

Mass m2 is hanging by a string that passes over a pulley and is connected to a block of mass m1 kept on a friction less surface. Find the minimum mass of m2 for the system to move

Why do camesl have large flat feet?

Which of the following is correct about work for an object of mass ′m′ displaced vertically by a distance of ′h′?

Why cant humans hear ultrasonic sounds?

A solid of mass 22 kg is immersed in water. If it loses half of its weight in water, its R.D. will be

A pendulum makes 135 oscillations in a duration of 15 seconds. The time period of the pendulum is .

Seven homogeneous bricks, each of length L, are arranged as shown in figure (9.E2). Each brick is displaced with respect to the one in contact by L10. Find the x-coordinate of the centre of mass relative to the origin shown.

State Newton's law of universal gravitation.

The charge on an electron is known to be 1.6×10−19 C. In a circuit, the current flowing is 1 A. How many electrons will be flowing through the circuit per second?

Compare a natural magnet and an electromagnet. Explain the term electric cell and switch.

Name the characteristic which helps us distinguish between a man's voice and a woman's voice, without seeing them.

what is the difference between thrust and pressure?

If magnetic needle does not deflect, and LED or bulb also does not glow while testing a solution for electrical conductivity, it might imply:

Two rods A and B of different materials are welded together as shown in the figure. If their thermal conductivities are k1 and k2, the thermal conductivity of the composite rod will be

Density is a___ quantity. (scalar/vector)

Which of the following frequency is an ultrasonic sound?

Statement 1: Charcoal is a better biomass than wood. Statement 2: Charcoal burns without flames and comparatively smokeless and has higher heat generation.

What physical quantity does the slope of a S-T graph represent

What is a magnetic field?

Question 8 The weight of 72 books is 9kg. What is the weight of 40 such books?

What is the range of frequencies associated with (a) infrasound (b) audible sound, and (c) ultrasound ?

Name and state the principle on which a hydraulic press works. Write one use of the hydraulic press.

1 J equals to : (a) 0.24 cal (b) 4.18 cal (c) 1 cal (d) 1 kcal

Statement I: Fossil fuels are renewable source of energy. Statement II: Renewable sources are collected from resources which are naturally replenished on a human timescale, such as sunlight, the wind, rain, tides, waves, and geothermal heat.

In the case of a moving body, force is not needed

It took 2s after lightening for the sound of thunder to reach you,how far did the lightening struck ?

A cubical body of mass 5kg and side of length 20 cm is half immersed in a liquid .find the magnitude of upthrust on it.taking g=10m/s2

If an object is in motion in a straight line the magnitude of speedbis it's velocity?

A sound signal of 128 vibrations per seconds has a wavelength of 2.7m . Calculate the speed with which the wave travels.

The SI unit of acceleration is________.

A car accelerates uniformly from 18 km hr-1 to 36 km hr-1 in 5 seconds. Find A) Acceleration B) Distance travelled

How does a karate player break a slab of ice with a single blow?

Person a drops a ball and calculates the time to hit the ground in his science lab and another person is trying the same thing in an elevator which is going up at the velocity of 10 M per second. Who will note the more time for the ball to reach the ground?

At a distance of 400m from a traffic signal, brakes are applied to a locomotive to produce an retardation of 0.3m/s^2. Initial velocity of the locomotive is 54 km/hr. Determine the position of the locomotive with respect to the traffic light after the application of brakes for 1 min.

A 40 KG SHELL IS MOVING WITH A VELOCITY OF 72 KM/HR. IT EXPLODES INTO TWO PIECES. ONE PIECE OF MASS 15 KG STOPS . CALCULATE THE VELOCITY OF THE OTHER ONE. PS.FROM MY REVISION WORKSHEET

If a person drops a pebble in a well of 100 m depth, after how much time (in seconds) will he be able to hear the sound? Given: Acceleration due to gravity, g=10 ms−2 Speed of sound in air, v=343 ms−1

What is acceleration?

Velocity-time graph for the uniform accelerated motions of two objects P and Q are shown in figure I and II respectively: (i) Which object starts from rest? (ii) Which object P and Q has more velocity after 5 second?

What is represented by the area under acceleration time graph?

An effort of 240 N overcome a useful load 1000 N when applied to a block and system of pulleys; such that the weight of movable block and friction is 220 N. What is the efficiency of the system?

Two planets of radii r1 and r2 ​are made from the same material. The ratio of the acceleration due to gravity g1g2​ at the surface of the two planets is:

Which of the following is/are correct?

Two planets of radii r1 and r2 are made from the same material. The ratio of the acceleration due to gravity g1g2 at the surface of the two planets is: