13232 + Interview Questions in Physics Page 115 InterviewSolution

5701.	Statement 1: Dams are constructed to produce hydel electricity Statement 2: Dam obstruct the flow of water and water level rises thereby increasing the potential energy which is further converted to kinetic and then to electric energy.
Answer» Statement 1: Dams are constructed to produce hydel electricity Statement 2: Dam obstruct the flow of water and water level rises thereby increasing the potential energy which is further converted to kinetic and then to electric energy.

5701.

Statement 1: Dams are constructed to produce hydel electricity Statement 2: Dam obstruct the flow of water and water level rises thereby increasing the potential energy which is further converted to kinetic and then to electric energy.

Answer»

Statement 1: Dams are constructed to produce hydel electricity

Statement 2: Dam obstruct the flow of water and water level rises thereby increasing the potential energy which is further converted to kinetic and then to electric energy.

Discussion

5702.	A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 kmph. Its velocity is slowed down to 18 kmph in 4 s by an unbalanced external force. Calculate the acceleration and change in momentum. Also calculate the magnitude of the force required.
Answer» A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 $k m p h$ . Its velocity is slowed down to 18 $k m p h$ in 4 s by an unbalanced external force. Calculate the acceleration and change in momentum. Also calculate the magnitude of the force required.

Discussion

5703.	The weight of a solid is 80g in air and 50g in a liquid of relative density 1.5. The specific gravity of the solid is -
Answer» The weight of a solid is 80g in air and 50g in a liquid of relative density 1.5. The specific gravity of the solid is -

Discussion

5704.	51.Prove that work done by a gas depends on the path
Answer» 51.Prove that work done by a gas depends on the path

Discussion

5705.	Question 2 Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?
Answer» Question 2 Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

Discussion

5706.	A particle is projected with the speed of 20 m/s atangle 37^° with the horizontal as shown in the figure.The velocity vector of the particle at t =-s will be(=-10/mg?)-m/s
Answer» A particle is projected with the speed of 20 m/s atangle 37^° with the horizontal as shown in the figure.The velocity vector of the particle at t =-s will be(=-10/mg?)-m/s

Discussion

5707.	भाव स्पष्ट कीजिए−कस्तूरी कुंडलि बसै, मृग ढूँढै बन माँहि।
Answer» भाव स्पष्ट कीजिए− कस्तूरी कुंडलि बसै, मृग ढूँढै बन माँहि।

5707.

भाव स्पष्ट कीजिए−कस्तूरी कुंडलि बसै, मृग ढूँढै बन माँहि।

Answer»

भाव स्पष्ट कीजिए−

कस्तूरी कुंडलि बसै, मृग ढूँढै बन माँहि।

Discussion

5708.	How does the brook ‘sparkle’?
Answer» How does the brook ‘sparkle’?

Discussion

5709.	A uniform disc of radius R lies in X -Y plane with its centre at origin.Its moment of inertia about the axis x=2R and y=0 is equal to the moment of inertia about the axis y=d and z=0 ,where d is equal to ?
Answer» A uniform disc of radius R lies in X -Y plane with its centre at origin.Its moment of inertia about the axis x=2R and y=0 is equal to the moment of inertia about the axis y=d and z=0 ,where d is equal to ?

Discussion

5710.	If the path of the particle is y=4 X2. How to find velocity
Answer» If the path of the particle is y=4 X2. How to find velocity

Discussion

5711.	11.If the units of force ,energy and velocity are 10N , 100 J AND 5 m/s then the units of length ,mass and time will be??
Answer» 11.If the units of force ,energy and velocity are 10N , 100 J AND 5 m/s then the units of length ,mass and time will be??

Discussion

5712.	How on decreasing speed, acceleration is in the opposite direction of velocity?
Answer» How on decreasing speed, acceleration is in the opposite direction of velocity?

Discussion

5713.	When two solids are put in two pans of a beam balance, they exactly balance each other in air. When the two solids are completely immersed in water alongwith pans of balance, then they no longer balance each other. Which of the following is the incorrect statement about these balls ?(1) they have equal masses in air(2) they have equal weights in air(3) they have equal volumes in air(4) they have unequal densities
Answer» When two solids are put in two pans of a beam balance, they exactly balance each other in air. When the two solids are completely immersed in water alongwith pans of balance, then they no longer balance each other. Which of the following is the incorrect statement about these balls ? (1) they have equal masses in air (2) they have equal weights in air (3) they have equal volumes in air (4) they have unequal densities

Discussion

5714.	Why do electrons move in specified direction?
Answer» Why do electrons move in specified direction?

Discussion

5715.	An electric bulb is rated (50W, 200 V). If it is operated at 100 V, then find the power consumed by it.
Answer» An electric bulb is rated (50W, 200 V). If it is operated at 100 V, then find the power consumed by it.

Discussion

5716.	how to calculate depth when pressure and density are give
Answer» how to calculate depth when pressure and density are give

Discussion

5717.	A stone falls freely under gravity it covers dis†an ces h1,h2, and h3 in the first 5 seconds the next 5 seconds and the next 5 seconds respectively the relation between h1,h2 and h3 is
Answer» A stone falls freely under gravity it covers dis†an ces h1,h2, and h3 in the first 5 seconds the next 5 seconds and the next 5 seconds respectively the relation between h1,h2 and h3 is

Discussion

5718.	A car covers a distance of 250 m in 6 seconds. If the acceleration of the car is 6 ms−2. Find the final velocity of the car.
Answer» A car covers a distance of 250 m in 6 seconds. If the acceleration of the car is $6 m s^{- 2}$ . Find the final velocity of the car.

Discussion

5719.	18.Dufference between SHM and oscillatory motion
Answer» 18.Dufference between SHM and oscillatory motion

Discussion

5720.	An object thrown vertically up from the ground passes the height 5m twice in an interval of 10s. What is the time of flight?
Answer» An object thrown vertically up from the ground passes the height 5m twice in an interval of 10s. What is the time of flight?

Discussion

5721.	For a heat engine operating on carnot cycle the output is25% of the heat rejected to the surrounding atmosphere The thermal efficiency of engine is
Answer» For a heat engine operating on carnot cycle the output is25% of the heat rejected to the surrounding atmosphere The thermal efficiency of engine is

Discussion

5722.	An object of mass 100 kg is accelerated uniformly from a velocity of 5 m/s to 8 m/s in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.
Answer» An object of mass 100 kg is accelerated uniformly from a velocity of 5 m/s to 8 m/s in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

Discussion

5723.	How do bats avoid obstacles in their way, when in flight ?
Answer» How do bats avoid obstacles in their way, when in flight ?

Discussion

5724.	Two objects of equal masses having the velocities 1 ms and 2ms respectively. Find out the ratio of their kinetic energies.
Answer» Two objects of equal masses having the velocities 1 $\frac{m}{s}$ and 2 $\frac{m}{s}$ respectively. Find out the ratio of their kinetic energies.

Discussion

5725.	an electron is moving vertically downwards at any place . the horizontal component of earths magnetic field acts upon it .what will be the direction of magnetic force acting on the electron
Answer» an electron is moving vertically downwards at any place . the horizontal component of earths magnetic field acts upon it .what will be the direction of magnetic force acting on the electron

Discussion

5726.	The ratio of velocity of sound in diatomic gas to rms velocity of gas is
Answer» The ratio of velocity of sound in diatomic gas to rms velocity of gas is

Discussion

5727.	A balloon rises from rest with a constant acceleration g/8.A stone is released from it when it has risen to height h. The time taken by the stone to reach the ground is
Answer» A balloon rises from rest with a constant acceleration g/8.A stone is released from it when it has risen to height h. The time taken by the stone to reach the ground is

Discussion

5728.	Calculate the amount of work done required in moving 5×1020 electrons across two points of a wire with a potential difference of 8 V.
Answer» Calculate the amount of work done required in moving $5 \times 10^{20}$ electrons across two points of a wire with a potential difference of $8 V$ .

Discussion

5729.	Explain the experiment done for discovering proton
Answer» Explain the experiment done for discovering proton

Discussion

5730.	20 An ion with mass no 37 posses one unit of negative charge .If the ion contains11.1% more neutrons than electrons ,the symbol of ion X is
Answer» 20 An ion with mass no 37 posses one unit of negative charge .If the ion contains11.1% more neutrons than electrons ,the symbol of ion X is

Discussion

5731.	A uniform rod of mass 10 kag and length 2 m is placed along x-axis such that its one end is at the origin. Moment of inertia of the rod about z-axis is
Answer» A uniform rod of mass 10 kag and length 2 m is placed along x-axis such that its one end is at the origin. Moment of inertia of the rod about z-axis is

Discussion

5732.	why is weight a vector quantity ?..plz explain conceptually
Answer» why is weight a vector quantity ?..plz explain conceptually

Discussion

5733.	A point source of sound is placed in a non absorbing medium.Two points A and B are at a dia†an ce of 1m and 2m respectively,from the source.The ratio of amplitudes of waves at A to B i
Answer» A point source of sound is placed in a non absorbing medium.Two points A and B are at a dia†an ce of 1m and 2m respectively,from the source.The ratio of amplitudes of waves at A to B i

Discussion

5734.	The correct equation of motion is :
Answer» The correct equation of motion is :

Discussion

5735.	What is the difference between sigmoid notch and radial notch?
Answer» What is the difference between sigmoid notch and radial notch?

Discussion

5736.	A car of mass 1500kg is moving with a certain velocity, u. It is brought to rest by the application of brakes, within a distance of 20m when the average resistance being offered to it is 60000N.What was the velocity of the motor car?
Answer» A car of mass 1500kg is moving with a certain velocity, u. It is brought to rest by the application of brakes, within a distance of 20m when the average resistance being offered to it is 60000N.What was the velocity of the motor car?

Discussion

5737.	Area under velocity-time graph depicts a physical quantity that has the unit as _____.
Answer» Area under velocity-time graph depicts a physical quantity that has the unit as _____.

Discussion

5738.	Give one example is each case where: (a) the force is of contact, and (b) force is at a distance.
Answer» Give one example is each case where: (a) the force is of contact, and (b) force is at a distance.

Discussion

5739.	A cube of side 20 cm floats in a liquid ofdensity 2.5 times the density of cube. Theheight of cube remains outside the liquid is
Answer» A cube of side 20 cm floats in a liquid of density 2.5 times the density of cube. The height of cube remains outside the liquid is

Discussion

5740.	Fill in the following blanks with suitable words : (a) Sound is caused by ______. (b) A sound wave consists of places of higher pressure called ______ and places of ______ pressure called ______ . (c) Wave speed in metres per second equals frequency in ______ multiplied by ______ in ______ . (d) Sound cannot travel through ______ . (e) The speed of sound in a solid is ______ than the speed of sound in air. (f) When the frequency of the sound is increased, the wavelength ______ .
Answer» Fill in the following blanks with suitable words : (a) Sound is caused by ______. (b) A sound wave consists of places of higher pressure called ______ and places of ______ pressure called ______ . (c) Wave speed in metres per second equals frequency in ______ multiplied by ______ in ______ . (d) Sound cannot travel through ______ . (e) The speed of sound in a solid is ______ than the speed of sound in air. (f) When the frequency of the sound is increased, the wavelength ______ .

5740.

Fill in the following blanks with suitable words : (a) Sound is caused by . (b) A sound wave consists of places of higher pressure called and places of pressure called . (c) Wave speed in metres per second equals frequency in multiplied by in . (d) Sound cannot travel through . (e) The speed of sound in a solid is than the speed of sound in air. (f) When the frequency of the sound is increased, the wavelength .

Answer»

Fill in the following blanks with suitable words :

(a) Sound is caused by ______.

(b) A sound wave consists of places of higher pressure called ______ and places of ______ pressure called ______ .

(c) Wave speed in metres per second equals frequency in ______ multiplied by ______ in ______ .

(d) Sound cannot travel through ______ .

(e) The speed of sound in a solid is ______ than the speed of sound in air.

(f) When the frequency of the sound is increased, the wavelength ______ .

Discussion

5741.	A layer of ice 0.15 m thick has formed on the surface of a deep pond. If the temperature of upper surface of ice is constant and equal to that of the air which is −12∘ C , the time taken to increase the thickness of ice layer by 0.2 mm is?[ Given : latent heat of ice = 80 cal /gdensity of ice = 0.91gcm3thermal conductivity of ice = 0.5cals m K]
Answer» A layer of ice $0.15 m$ thick has formed on the surface of a deep pond. If the temperature of upper surface of ice is constant and equal to that of the air which is $- 12^{\circ} C$ , the time taken to increase the thickness of ice layer by $0.2 mm$ is? $[$ Given : latent heat of ice = $80 cal /g$ density of ice = $0.91 \frac{g}{c m^{3}}$ thermal conductivity of ice = $0.5 \frac{c a l}{s m K}]$

Discussion

5742.	A boat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 m/s2 for 8.0s. How far does the boat travel during this time?
Answer» A boat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 $m / s^{2}$ for 8.0s. How far does the boat travel during this time?

Discussion

5743.	Newton's first law of motion
Answer» Newton's first law of motion

Discussion

5744.	The potentials of two points A and B are respectively +V and -V volt. If the distance between them be r metre, then calculate (i) average electric field between A and B, (ii) change in potential energy in moving q coulomb of charge from point A to B.
Answer» The potentials of two points A and B are respectively +V and -V volt. If the distance between them be r metre, then calculate (i) average electric field between A and B, (ii) change in potential energy in moving q coulomb of charge from point A to B.

Discussion

5745.	Vernier caliper is used to measure ___.
Answer» Vernier caliper is used to measure ___.

Discussion

5746.	What is the general name of the waves consisting of : (a) compressions and rarefactions ? (b) crests and troughs ?
Answer» What is the general name of the waves consisting of : (a) compressions and rarefactions ? (b) crests and troughs ?

5746.

What is the general name of the waves consisting of : (a) compressions and rarefactions ? (b) crests and troughs ?

Answer»

What is the general name of the waves consisting of :

(a) compressions and rarefactions ?

(b) crests and troughs ?

Discussion

5747.	A cheetah starts from rest and accelerates with 2ms2 for 10 seconds. What is its velocity after 10 seconds?
Answer» A cheetah starts from rest and accelerates with $2 \frac{m}{s^{2}}$ for 10 seconds. What is its velocity after 10 seconds?

Discussion

5748.	the dis†an ce x covered by a particle x= a + bt
Answer» the dis†an ce x covered by a particle x= a + bt

Discussion

5749.	Among the given options, wavelength of which colour light is the shortest?
Answer» Among the given options, wavelength of which colour light is the shortest?

Discussion

5750.	Draw the following diagram in your answer-book and show the formation of the image of the object AB with the help of suitable rays.What type of reflecting surface is shown in the above diagram?
Answer» Draw the following diagram in your answer-book and show the formation of the image of the object AB with the help of suitable rays. What type of reflecting surface is shown in the above diagram?

Discussion

Explore topic-wise InterviewSolutions in .

Statement 1: Dams are constructed to produce hydel electricity Statement 2: Dam obstruct the flow of water and water level rises thereby increasing the potential energy which is further converted to kinetic and then to electric energy.

A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 kmph. Its velocity is slowed down to 18 kmph in 4 s by an unbalanced external force. Calculate the acceleration and change in momentum. Also calculate the magnitude of the force required.

The weight of a solid is 80g in air and 50g in a liquid of relative density 1.5. The specific gravity of the solid is -

51.Prove that work done by a gas depends on the path

Question 2 Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

A particle is projected with the speed of 20 m/s atangle 37^° with the horizontal as shown in the figure.The velocity vector of the particle at t =-s will be(=-10/mg?)-m/s

भाव स्पष्ट कीजिए−कस्तूरी कुंडलि बसै, मृग ढूँढै बन माँहि।

How does the brook ‘sparkle’?

A uniform disc of radius R lies in X -Y plane with its centre at origin.Its moment of inertia about the axis x=2R and y=0 is equal to the moment of inertia about the axis y=d and z=0 ,where d is equal to ?

If the path of the particle is y=4 X2. How to find velocity

11.If the units of force ,energy and velocity are 10N , 100 J AND 5 m/s then the units of length ,mass and time will be??

How on decreasing speed, acceleration is in the opposite direction of velocity?

Why do electrons move in specified direction?

An electric bulb is rated (50W, 200 V). If it is operated at 100 V, then find the power consumed by it.

how to calculate depth when pressure and density are give

A stone falls freely under gravity it covers dis†an ces h1,h2, and h3 in the first 5 seconds the next 5 seconds and the next 5 seconds respectively the relation between h1,h2 and h3 is

A car covers a distance of 250 m in 6 seconds. If the acceleration of the car is 6 ms−2. Find the final velocity of the car.

18.Dufference between SHM and oscillatory motion

An object thrown vertically up from the ground passes the height 5m twice in an interval of 10s. What is the time of flight?

For a heat engine operating on carnot cycle the output is25% of the heat rejected to the surrounding atmosphere The thermal efficiency of engine is

An object of mass 100 kg is accelerated uniformly from a velocity of 5 m/s to 8 m/s in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

How do bats avoid obstacles in their way, when in flight ?

Two objects of equal masses having the velocities 1 ms and 2ms respectively. Find out the ratio of their kinetic energies.

an electron is moving vertically downwards at any place . the horizontal component of earths magnetic field acts upon it .what will be the direction of magnetic force acting on the electron

The ratio of velocity of sound in diatomic gas to rms velocity of gas is

A balloon rises from rest with a constant acceleration g/8.A stone is released from it when it has risen to height h. The time taken by the stone to reach the ground is

Calculate the amount of work done required in moving 5×1020 electrons across two points of a wire with a potential difference of 8 V.

Explain the experiment done for discovering proton

20 An ion with mass no 37 posses one unit of negative charge .If the ion contains11.1% more neutrons than electrons ,the symbol of ion X is

A uniform rod of mass 10 kag and length 2 m is placed along x-axis such that its one end is at the origin. Moment of inertia of the rod about z-axis is

why is weight a vector quantity ?..plz explain conceptually

A point source of sound is placed in a non absorbing medium.Two points A and B are at a dia†an ce of 1m and 2m respectively,from the source.The ratio of amplitudes of waves at A to B i

The correct equation of motion is :

What is the difference between sigmoid notch and radial notch?

A car of mass 1500kg is moving with a certain velocity, u. It is brought to rest by the application of brakes, within a distance of 20m when the average resistance being offered to it is 60000N.What was the velocity of the motor car?

Area under velocity-time graph depicts a physical quantity that has the unit as _____.

Give one example is each case where: (a) the force is of contact, and (b) force is at a distance.

A cube of side 20 cm floats in a liquid ofdensity 2.5 times the density of cube. Theheight of cube remains outside the liquid is

A boat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 m/s2 ​ for 8.0s. How far does the boat travel during this time?

Newton's first law of motion

The potentials of two points A and B are respectively +V and -V volt. If the distance between them be r metre, then calculate (i) average electric field between A and B, (ii) change in potential energy in moving q coulomb of charge from point A to B.

Vernier caliper is used to measure ___.

What is the general name of the waves consisting of : (a) compressions and rarefactions ? (b) crests and troughs ?

A cheetah starts from rest and accelerates with 2ms2 for 10 seconds. What is its velocity after 10 seconds?

the dis†an ce x covered by a particle x= a + bt

Among the given options, wavelength of which colour light is the shortest?

Draw the following diagram in your answer-book and show the formation of the image of the object AB with the help of suitable rays.​What type of reflecting surface is shown in the above diagram?

A boat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 m/s2 for 8.0s. How far does the boat travel during this time?

Draw the following diagram in your answer-book and show the formation of the image of the object AB with the help of suitable rays.What type of reflecting surface is shown in the above diagram?