13232 + Interview Questions in Physics Page 256 InterviewSolution

12751.	Find force if initial velocity is 20m/sec or 72 KMPH and final velocity is 0 m/sec and mass of body is 400grams
Answer» Find force if initial velocity is 20m/sec or 72 KMPH and final velocity is 0 m/sec and mass of body is 400grams

Discussion

12752.	A car covers the first half of the distance in 40 km/hr and the second half in 60 km/hr. what is the avrage speed of the car?
Answer» A car covers the first half of the distance in 40 km/hr and the second half in 60 km/hr. what is the avrage speed of the car?

Discussion

12753.	What is the difference between force due to gravity and acceleration due to gravity?(Please explain theoretically.)
Answer» What is the difference between force due to gravity and acceleration due to gravity?(Please explain theoretically.)

Discussion

12754.	Describe the method for predicting if a motion is uniformly accelerated or not:
Answer» Describe the method for predicting if a motion is uniformly accelerated or not:

Discussion

12755.	A 8000 kg engine pulls a train of 5 wagons each of 2000 kg along a horizontal track. If the engine exerts a force of 40000 N and track offers a friction force of 5000N then calculate the force of wagon 1 on wagon 2.
Answer» A 8000 kg engine pulls a train of 5 wagons each of 2000 kg along a horizontal track. If the engine exerts a force of 40000 N and track offers a friction force of 5000N then calculate the force of wagon 1 on wagon 2.

Discussion

12756.	PHYSICS \| STANDARD IXQuestion ID 230089 An athlete takes 't' seconds to complete one round of a circular track of radius 'r' . Write an expression for his velocity, if he is in uniform circular motion. Give 2 more examples if the same type of motion... Please Answer Regards CJ
Answer» PHYSICS \| STANDARD IXQuestion ID 230089 An athlete takes 't' seconds to complete one round of a circular track of radius 'r' . Write an expression for his velocity, if he is in uniform circular motion. Give 2 more examples if the same type of motion... Please Answer Regards CJ

Discussion

12757.	A stone is thrown upwards from the surface of the earth with an initial speed of 5ms-1 The stone comes to rest at a height of?
Answer» A stone is thrown upwards from the surface of the earth with an initial speed of 5ms^-1 The stone comes to rest at a height of?

Discussion

12758.	What happens to the needle of a compass if you place the compass near a current carrying wire?
Answer» What happens to the needle of a compass if you place the compass near a current carrying wire?

Discussion

12759.	Explain the following : (a) Icebergs floating in sea are dangerous for ships. (b) An egg sinks in fresh water, but floats in a strong salt solution. (c) A toy balloon filled with hydrogen rises to the ceiling, but if filled with carbon dioxide sinks to the floor. (d) As a ship in harbour is being unloaded, it slowly rises higher in water. (e) A balloon filled with hydrogen rises to a certain height and then stops rising further. (f) A ship submerges more as it sails from sea water to river water.
Answer» Explain the following : (a) Icebergs floating in sea are dangerous for ships. (b) An egg sinks in fresh water, but floats in a strong salt solution. (c) A toy balloon filled with hydrogen rises to the ceiling, but if filled with carbon dioxide sinks to the floor. (d) As a ship in harbour is being unloaded, it slowly rises higher in water. (e) A balloon filled with hydrogen rises to a certain height and then stops rising further. (f) A ship submerges more as it sails from sea water to river water.

Discussion

12760.	In which of the following mediums does sound travel fastest at a particular temperature?
Answer» In which of the following mediums does sound travel fastest at a particular temperature?

Discussion

12761.	Which of the following is a postulate of the Bohr's model of the atom?
Answer» Which of the following is a postulate of the Bohr's model of the atom?

Discussion

12762.	Use the following information to answer the next question. The given figure shows the main scale and vernier scale of a vernier caliper. What are the pitch and least count of the vernier caliper?
Answer» Use the following information to answer the next question. The given figure shows the main scale and vernier scale of a vernier caliper. What are the pitch and least count of the vernier caliper?

12762.

Use the following information to answer the next question. The given figure shows the main scale and vernier scale of a vernier caliper. What are the pitch and least count of the vernier caliper?

Answer»

Use the following information to answer the next question.

The given figure shows the main scale and vernier scale of a vernier caliper.

What are the pitch and least count of the vernier caliper?

Discussion

12763.	Determine the heat required to convert 3 kg of ice from −7∘C to 40∘C. Latent heat of ice = 334.7 J/kg K, specific heat of ice = 2108 J/kg K and specific heat of water = 4186 J/kg K.
Answer» Determine the heat required to convert $3 k g$ of ice from $- 7^{\circ} C$ to $40^{\circ} C$ . Latent heat of ice = $334.7 J / k g K$ , specific heat of ice = $2108 J / k g K$ and specific heat of water = $4186 J / k g K$ .

Discussion

12764.	Under which condition is the magnitude of average velocity equal to average speed?
Answer» Under which condition is the magnitude of average velocity equal to average speed?

Discussion

12765.	A bullet of 5 g is fired from a pistol of 1.5 kg. If the recoil velocity of a pistol is 1.5 ms, find the velocity of the bullet. (in ms)
Answer» A bullet of 5 g is fired from a pistol of 1.5 kg. If the recoil velocity of a pistol is $1.5 \frac{m}{s}$ , find the velocity of the bullet. (in $\frac{m}{s}$ )

Discussion

12766.	What do you understand by the chain reaction in nuclear fission? How is it controlled? [3 MARKS]
Answer» What do you understand by the chain reaction in nuclear fission? How is it controlled? [3 MARKS]

Discussion

12767.	A conductor carries a current of 0.2 A. How many electrons will flow in 30 seconds if the charge on one electron is 1.6×10−19 C.
Answer» A conductor carries a current of 0.2 A. How many electrons will flow in 30 seconds if the charge on one electron is $1.6 \times 10^{- 19} C$ .

Discussion

12768.	Define mass. If mass and radius of the Earth are 6.0×1024 kg and 6.4×106 m respectively, calculate the force exerted by the Earth on a body of mass 1 kg. Also, calculate acceleration produced in the body of mass 1 kg and acceleration produced in the Earth. [5 MARKS]
Answer» Define mass. If mass and radius of the Earth are $6.0 \times 10^{24}$ kg and $6.4 \times 10^{6}$ m respectively, calculate the force exerted by the Earth on a body of mass 1 kg. Also, calculate acceleration produced in the body of mass 1 kg and acceleration produced in the Earth. [5 MARKS]

Discussion

12769.	A frontend loader applied 150 N of force to lift a stone. If a work of 1250 joules was done in total, then what is the distance moved by the stone?
Answer» A frontend loader applied 150 N of force to lift a stone. If a work of 1250 joules was done in total, then what is the distance moved by the stone?

Discussion

12770.	A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate :(i) the work done, and (ii) the power developed by him.Take g=10 N kg−1.
Answer» A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate :(i) the work done, and (ii) the power developed by him.Take g=10 N $k g^{- 1}$ .

Discussion

12771.	A missile has been fired with an initial speed u. If the speed is tripled, what will be the corresponding change in its kinetic energy?
Answer» A missile has been fired with an initial speed u. If the speed is tripled, what will be the corresponding change in its kinetic energy?

Discussion

12772.	The physical quantity that remains zero for an object moving with a uniform velocity is (in ideal case):
Answer» The physical quantity that remains zero for an object moving with a uniform velocity is (in ideal case):

Discussion

12773.	The interaction between Earth and Moon which keeps Moon revolving around the earth is:
Answer» The interaction between Earth and Moon which keeps Moon revolving around the earth is:

Discussion

12774.	Question 12 The angle between incident ray and reflected ray is 60∘. What is the value of angle of incidence? Given that, angle of incidence + angle of reflection=60∘.
Answer» Question 12 The angle between incident ray and reflected ray is $60^{\circ}$ . What is the value of angle of incidence? Given that, angle of incidence + angle of reflection= $60^{\circ}$ .

12774.

Question 12 The angle between incident ray and reflected ray is 60∘. What is the value of angle of incidence? Given that, angle of incidence + angle of reflection=60∘.

Answer»

Question 12

The angle between incident ray and reflected ray is $60^{\circ}$ . What is the value of angle of incidence? Given that, angle of incidence + angle of reflection= $60^{\circ}$ .

Discussion

12775.	Question 1 (c) Which of the following has more inertia: (c) a five-rupee coin and a one-rupee coin?
Answer» Question 1 (c) Which of the following has more inertia: (c) a five-rupee coin and a one-rupee coin?

Discussion

12776.	In which of the following case the work done by a force will be maximum: when the angle between the direction of force and direction of motion is 0∘or90∘?
Answer» In which of the following case the work done by a force will be maximum: when the angle between the direction of force and direction of motion is $0^{\circ} o r 90^{\circ}$ ?

Discussion

12777.	When a bullet of mass 50 g is fired from a gun of mass 10 kg, the gun recoils with a velocity 2 m/s. Find the muzzle velocity of the bullet.
Answer» When a bullet of mass 50 g is fired from a gun of mass 10 kg, the gun recoils with a velocity 2 m/s. Find the muzzle velocity of the bullet.

Discussion

12778.	When a golf ball is lowered into a measuring cylinder containing water,the water level rises by 30 cm3 when the ball is completely submerged.If the mass of ball in air is 33 g,find its density.
Answer» When a golf ball is lowered into a measuring cylinder containing water,the water level rises by 30 $c m^{3}$ when the ball is completely submerged.If the mass of ball in air is 33 g,find its density.

Discussion

12779.	Why is friction responsible for stopping objects?
Answer» Why is friction responsible for stopping objects?

Discussion

12780.	If the wavelength of a sound wave is 40 cm and the time period T=0.0005 s, how many seconds will it take to travel 4 km?
Answer» If the wavelength of a sound wave is $40 c m$ and the time period $T = 0.0005 s$ , how many seconds will it take to travel $4 k m$ ?

Discussion

12781.	A stone of 1kg is thrown with a velocity of 20 ms−1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?
Answer» A stone of $1 k g$ is thrown with a velocity of $20 m s^{- 1}$ across the frozen surface of a lake and comes to rest after travelling a distance of $50 m$ . What is the force of friction between the stone and the ice?

Discussion

12782.	The time taken by two consecutive compressions or rarefactions to cross a fixed point is called__.
Answer» The time taken by two consecutive compressions or rarefactions to cross a fixed point is called__.

Discussion

12783.	A particle of mass 1 kg is projected upwards with velocity 60 m/s. Another particle of mass 2 kg is just dropped from a certain height. Find out the acceleration and the velocity of COM after 2 s when neither of the particles has collided with the ground.
Answer» A particle of mass 1 kg is projected upwards with velocity 60 m/s. Another particle of mass 2 kg is just dropped from a certain height. Find out the acceleration and the velocity of COM after 2 s when neither of the particles has collided with the ground.

Discussion

12784.	Why every particle attract another particle in universe? and why there is a existance of gravity?
Answer» Why every particle attract another particle in universe? and why there is a existance of gravity?

Discussion

12785.	An arrow fired from a bow attains a maximum height of 5 m from the level it is released. If the mass of the arrow is 500 grams, work done by the bow on arrow is greater than which of the following? (Assume, g=10 m/s2)
Answer» An arrow fired from a bow attains a maximum height of $5 m$ from the level it is released. If the mass of the arrow is $500 g r a m s$ , work done by the bow on arrow is greater than which of the following? (Assume, $g = 10 m / s^{2}$ )

Discussion

12786.	An insect moves along a circular path of radius 10 cm with a constant speed. If it takes 1 minute to move from a point on the path to the diametrically opposite point, then the distance covered, speed, displacement and average velocity respectively are
Answer» An insect moves along a circular path of radius 10 cm with a constant speed. If it takes 1 minute to move from a point on the path to the diametrically opposite point, then the distance covered, speed, displacement and average velocity respectively are

Discussion

12787.	Calculate the pressure in Nm−2 experienced by a surface of area 15 m2, when a thrust of 185 N is applied on it.12.333
Answer» Calculate the pressure in $N m^{- 2}$ experienced by a surface of area $15 m^{2}$ , when a thrust of $185 N$ is applied on it. 12.333

Discussion

12788.	When gravity is pulling the water down, why does the water rise in the process of chromatography?
Answer» When gravity is pulling the water down, why does the water rise in the process of chromatography?

Discussion

12789.	Why this happens when 2 objects of different masses reaches at the same time to th ground ?
Answer» Why this happens when 2 objects of different masses reaches at the same time to th ground ?

Discussion

12790.	Time period of a sound wave is defined as:
Answer» Time period of a sound wave is defined as:

Discussion

12791.	We know that If a ball of mass 1 kg is kept at a height 10 m possess potential energy mghi.e. (1×10×10)=100 J. (Taking earth surface as reference, where m = mass of object, g = acceleration due to gravity, h = height of object from earth surface.) what will be the kinetic energy of the ball when the ball is allowed to freely fall from a height 10m just before it hits the ground? (take g = 10 m/s2 and neglect air drag)
Answer» We know that If a ball of mass $1 k g$ is kept at a height $10 m$ possess potential energy $m g h$ i.e. $(1 \times 10 \times 10) = 100$ J. (Taking earth surface as reference, where m = mass of object, g = acceleration due to gravity, h = height of object from earth surface.) what will be the kinetic energy of the ball when the ball is allowed to freely fall from a height $10 m$ just before it hits the ground? (take g = 10 $m / s^{2}$ and neglect air drag)

Discussion

12792.	Obtain a relation for distance travelled by an object moving with a uniform acceleration in interval between 4th and 5th second.
Answer» Obtain a relation for distance travelled by an object moving with a uniform acceleration in interval between 4th and 5th second.

Discussion

12793.	Explain how it is possible to skate on ice without leaving a trail behind
Answer» Explain how it is possible to skate on ice without leaving a trail behind

Discussion

12794.	A car travels 8m towards north with the speed of 2m/sand then 6m towards south with the speed of 3m/s. Find the magnitude of average velocity
Answer» A car travels 8m towards north with the speed of 2m/sand then 6m towards south with the speed of 3m/s. Find the magnitude of average velocity

Discussion

12795.	Which of the following statement represents one-dimensional motion?
Answer» Which of the following statement represents one-dimensional motion?

Discussion

12796.	World's first artificial satellite was:
Answer» World's first artificial satellite was:

Discussion

12797.	please explain GRAVITATIONAL POTENTIAL ENERGY? AND PROVE THAT IT DOESN'T DEPENDS UPON PATH ?
Answer» please explain GRAVITATIONAL POTENTIAL ENERGY? AND PROVE THAT IT DOESN'T DEPENDS UPON PATH ?

Discussion

12798.	Why is the sound longitudinal wave and not transverse wave ?
Answer» Why is the sound longitudinal wave and not transverse wave ?

Discussion

12799.	As if the force is constantly increase there is increase in acceleration therefore increase in kinetic energy making velocity increase to infinity but it cannot go beyond velocity of light therefore mass increases to compensate the velocity but then how can blackhole form if any object cannot go beyond the speed of light?
Answer» As if the force is constantly increase there is increase in acceleration therefore increase in kinetic energy making velocity increase to infinity but it cannot go beyond velocity of light therefore mass increases to compensate the velocity but then how can blackhole form if any object cannot go beyond the speed of light?

Discussion

12800.	An electric motor works making use of
Answer» An electric motor works making use of

Discussion

Explore topic-wise InterviewSolutions in .

Find force if initial velocity is 20m/sec or 72 KMPH and final velocity is 0 m/sec and mass of body is 400grams ​​​​

A car covers the first half of the distance in 40 km/hr and the second half in 60 km/hr. what is the avrage speed of the car?

What is the difference between force due to gravity and acceleration due to gravity?(Please explain theoretically.)

Describe the method for predicting if a motion is uniformly accelerated or not:

A 8000 kg engine pulls a train of 5 wagons each of 2000 kg along a horizontal track. If the engine exerts a force of 40000 N and track offers a friction force of 5000N then calculate the force of wagon 1 on wagon 2.

PHYSICS | STANDARD IXQuestion ID 230089 An athlete takes 't' seconds to complete one round of a circular track of radius 'r' . Write an expression for his velocity, if he is in uniform circular motion. Give 2 more examples if the same type of motion... Please Answer Regards CJ

A stone is thrown upwards from the surface of the earth with an initial speed of 5ms-1 The stone comes to rest at a height of?

What happens to the needle of a compass if you place the compass near a current carrying wire?

In which of the following mediums does sound travel fastest at a particular temperature?

Which of the following is a postulate of the Bohr's model of the atom?

Use the following information to answer the next question. The given figure shows the main scale and vernier scale of a vernier caliper. What are the pitch and least count of the vernier caliper?

Determine the heat required to convert 3 kg of ice from −7∘C to 40∘C. Latent heat of ice = 334.7 J/kg K, specific heat of ice = 2108 J/kg K and specific heat of water = 4186 J/kg K.

Under which condition is the magnitude of average velocity equal to average speed?

A bullet of 5 g is fired from a pistol of 1.5 kg. If the recoil velocity of a pistol is 1.5 ms, find the velocity of the bullet. (in ms)

What do you understand by the chain reaction in nuclear fission? How is it controlled? [3 MARKS]

A conductor carries a current of 0.2 A. How many electrons will flow in 30 seconds if the charge on one electron is 1.6×10−19 C.

Define mass. If mass and radius of the Earth are 6.0×1024 kg and 6.4×106 m respectively, calculate the force exerted by the Earth on a body of mass 1 kg. Also, calculate acceleration produced in the body of mass 1 kg and acceleration produced in the Earth. [5 MARKS]

A frontend loader applied 150 N of force to lift a stone. If a work of 1250 joules was done in total, then what is the distance moved by the stone?

A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate :(i) the work done, and (ii) the power developed by him.Take g=10 N kg−1.

A missile has been fired with an initial speed u. If the speed is tripled, what will be the corresponding change in its kinetic energy?

The physical quantity that remains zero for an object moving with a uniform velocity is (in ideal case):

The interaction between Earth and Moon which keeps Moon revolving around the earth is:

Question 12 The angle between incident ray and reflected ray is 60∘. What is the value of angle of incidence? Given that, angle of incidence + angle of reflection=60∘.

Question 1 (c) Which of the following has more inertia: (c) a five-rupee coin and a one-rupee coin?

In which of the following case the work done by a force will be maximum: when the angle between the direction of force and direction of motion is 0∘or90∘?

When a bullet of mass 50 g is fired from a gun of mass 10 kg, the gun recoils with a velocity 2 m/s. Find the muzzle velocity of the bullet.

When a golf ball is lowered into a measuring cylinder containing water,the water level rises by 30 cm3 when the ball is completely submerged.If the mass of ball in air is 33 g,find its density.

Why is friction responsible for stopping objects?

If the wavelength of a sound wave is 40 cm and the time period T=0.0005 s, how many seconds will it take to travel 4 km?

A stone of 1kg is thrown with a velocity of 20 ms−1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

The time taken by two consecutive compressions or rarefactions to cross a fixed point is called__.

A particle of mass 1 kg is projected upwards with velocity 60 m/s. Another particle of mass 2 kg is just dropped from a certain height. Find out the acceleration and the velocity of COM after 2 s when neither of the particles has collided with the ground.

Why every particle attract another particle in universe? and why there is a existance of gravity?

An arrow fired from a bow attains a maximum height of 5 m from the level it is released. If the mass of the arrow is 500 grams, work done by the bow on arrow is greater than which of the following? (Assume, g=10 m/s2)

An insect moves along a circular path of radius 10 cm with a constant speed. If it takes 1 minute to move from a point on the path to the diametrically opposite point, then the distance covered, speed, displacement and average velocity respectively are

Calculate the pressure in Nm−2 experienced by a surface of area 15 m2, when a thrust of 185 N is applied on it.12.333

When gravity is pulling the water down, why does the water rise in the process of chromatography?

Why this happens when 2 objects of different masses reaches at the same time to th ground ?

Time period of a sound wave is defined as:

Obtain a relation for distance travelled by an object moving with a uniform acceleration in interval between 4th and 5th second.

Explain how it is possible to skate on ice without leaving a trail behind

A car travels 8m towards north with the speed of 2m/sand then 6m towards south with the speed of 3m/s. Find the magnitude of average velocity

Which of the following statement represents one-dimensional motion?

World's first artificial satellite was:

please explain GRAVITATIONAL POTENTIAL ENERGY? AND PROVE THAT IT DOESN'T DEPENDS UPON PATH ?

Why is the sound longitudinal wave and not transverse wave ?

An electric motor works making use of

Find force if initial velocity is 20m/sec or 72 KMPH and final velocity is 0 m/sec and mass of body is 400grams