13232 + Interview Questions in Physics Page 35 InterviewSolution

1701.	Question 2Explain the meaning of malleable and ductile.
Answer» Question 2 Explain the meaning of malleable and ductile.

Discussion

1702.	Why is 1 coulomb defined in a vacuum?
Answer» Why is 1 coulomb defined in a vacuum?

Discussion

1703.	question : Relate 1 Angstrom to nanometre
Answer» question : Relate 1 Angstrom to nanometre

Discussion

1704.	Which of the following statements is true?
Answer» Which of the following statements is true?

Discussion

1705.	6.why does the mud on the wheels of the moving vehicle flies tangentially
Answer» 6.why does the mud on the wheels of the moving vehicle flies tangentially

Discussion

1706.	a metalblock of density 6000kg/m3 and mass 1.2kg is suspended through a spring of spring constant 200N/m . the spring block system is dipped in water kept in a vessel . the water has mass 260g and the block is 40cm above the bottom of the vessel . if the support if the spring is broken, what will be rise in temperature of water.specific heat capacity of block is 250J/kg K.
Answer» a metalblock of density 6000kg/m3 and mass 1.2kg is suspended through a spring of spring constant 200N/m . the spring block system is dipped in water kept in a vessel . the water has mass 260g and the block is 40cm above the bottom of the vessel . if the support if the spring is broken, what will be rise in temperature of water.specific heat capacity of block is 250J/kg K.

Discussion

1707.	What we have do to save natural?
Answer» What we have do to save natural?

Discussion

1708.	In a hydraulic machine, the two pistons are of the area of cross-section in the ratio 1 : 20. What force is needed on the narrow piston to overcome a force of 200 N on the wider piston?
Answer» In a hydraulic machine, the two pistons are of the area of cross-section in the ratio 1 : 20. What force is needed on the narrow piston to overcome a force of 200 N on the wider piston?

Discussion

1709.	Four students have made the following circuit diagrams for determining the equivalent resistance of two resistors connected in series:The correct circuit diagram is :(1) A(2) B(3) C(4) D
Answer» Four students have made the following circuit diagrams for determining the equivalent resistance of two resistors connected in series: The correct circuit diagram is : (1) A (2) B (3) C (4) D

Discussion

1710.	Define reference point
Answer» Define reference point

Discussion

1711.	Establish the relation-V= ωr, where V= Linear speed, (ω)=angular speed, r= radius of the circular path
Answer» Establish the relation-V= ωr, where V= Linear speed, (ω)=angular speed, r= radius of the circular path

Discussion

1712.	The potential difference applied to an X-ray tube is 5 kV and the current flowing through it is 3.2 mA. Then what is the number of electrons striking the target per second? [The charge of one electron is e=−1.6×10−19 C]
Answer» The potential difference applied to an X-ray tube is 5 kV and the current flowing through it is 3.2 mA. Then what is the number of electrons striking the target per second? [The charge of one electron is $e = - 1.6 \times 10^{- 19} C$ ]

Discussion

1713.	Two planets have radii r1 and r2 and densities d1 and d2 respectively. The ratio of the acceleration due to gravity on them will be
Answer» Two planets have radii $r_{1}$ and $r_{2}$ and densities $d_{1}$ and $d_{2}$ respectively. The ratio of the acceleration due to gravity on them will be

Discussion

1714.	Which force is responsible for the earth to revolve around the sun ?
Answer» Which force is responsible for the earth to revolve around the sun ?

Discussion

1715.	Calculate the escape velocity (in km s−1) of Neptune. The mass of Neptune ≈1026 kg, radius of Neptune, ≈24,170 km23.5
Answer» Calculate the escape velocity (in ${km s}^{- 1}$ ) of Neptune. The mass of Neptune $\approx 10^{26} kg$ , radius of Neptune, $\approx 24, 170 km$ 23.5

Discussion

1716.	An object thrown vertically up from the ground passes the height 5 m twice in an interval of 10 s. What is its time of flight?(1) √28 s
Answer» An object thrown vertically up from the ground passes the height 5 m twice in an interval of 10 s. What is its time of flight? (1) √28 s

Discussion

1717.	Final velocity of an object under free fall
Answer» Final velocity of an object under free fall

Discussion

1718.	Coatings used on raincoat are waterproof because
Answer» Coatings used on raincoat are waterproof because

Discussion

1719.	21.a flywheel of moment of inertia 2kgm/s square is rotated at a speed of 30rad/s. a tangential force at the rim stops the wheel in 15seconds . Average torque of the force is??
Answer» 21.a flywheel of moment of inertia 2kgm/s square is rotated at a speed of 30rad/s. a tangential force at the rim stops the wheel in 15seconds . Average torque of the force is??

Discussion

1720.	The measure of mass and volume of a body are 2.00g and 5.0cm3respectively, with possible errors of 0.01g and 0.1cm3. What would be the maximum permissible error in its density?
Answer» The measure of mass and volume of a body are 2.00g and 5.0cm3respectively, with possible errors of 0.01g and 0.1cm3. What would be the maximum permissible error in its density?

Discussion

1721.	When an object is placed between the pole and the focus of a concave mirror, what can you say about the magnification?
Answer» When an object is placed between the pole and the focus of a concave mirror, what can you say about the magnification?

Discussion

1722.	A body floats with one- third of its volume outside the water. In another liquid , it floats with one- fourth of its volume inside the liquid. If density of water is 1 g/cc , then find the density of liquid
Answer» A body floats with one- third of its volume outside the water. In another liquid , it floats with one- fourth of its volume inside the liquid. If density of water is 1 g/cc , then find the density of liquid

Discussion

1723.	A passenger sitting in a train and facing towards the direction of its motion tosses a coin which falls behind him. This shows that the motion of train is
Answer» A passenger sitting in a train and facing towards the direction of its motion tosses a coin which falls behind him. This shows that the motion of train is

Discussion

1724.	Q.36 Two solid conductors are made up of same material and same resistance . one of them has a circular cross section area A1 and the other one has a square cross section of area A2 .the ratio of A1/A2 is
Answer» Q.36 Two solid conductors are made up of same material and same resistance . one of them has a circular cross section area A1 and the other one has a square cross section of area A2 .the ratio of A1/A2 is

Discussion

1725.	moving in a constant acceleration a particle 's travelling distance in t-th second is s=3+2t ,then what was the initial velocity of that particle?
Answer» moving in a constant acceleration a particle 's travelling distance in t-th second is s=3+2t ,then what was the initial velocity of that particle?

Discussion

1726.	What is the role of decomposers in the ecosystem? [2 MARKS]
Answer» What is the role of decomposers in the ecosystem? [2 MARKS]

Discussion

1727.	निम्नलिखितप्रश्न का उत्तर(25-30 शब्दोंमें)लिखिए−सआदतअली कौन था?उसनेवज़ीर अली कीपैदाइश को अपनीमौत क्यों समझा?
Answer» निम्नलिखित प्रश्न का उत्तर (25-30 शब्दों में) लिखिए − सआदत अली कौन था? उसने वज़ीर अली की पैदाइश को अपनी मौत क्यों समझा?

1727.

निम्नलिखितप्रश्न का उत्तर(25-30 शब्दोंमें)लिखिए−सआदतअली कौन था?उसनेवज़ीर अली कीपैदाइश को अपनीमौत क्यों समझा?

Answer»

निम्नलिखित
प्रश्न का उत्तर
(25-30 शब्दों
में)
लिखिए
−

सआदत
अली कौन था?
उसने
वज़ीर अली की
पैदाइश को अपनी
मौत क्यों समझा?

Discussion

1728.	A man throws an object weighing 500 g vertically upwards with a velocity of 10 m/s 1. Find its initial momentum 2. Find its momentum at the highest point of flight
Answer» A man throws an object weighing 500 g vertically upwards with a velocity of 10 m/s 1. Find its initial momentum 2. Find its momentum at the highest point of flight

1728.

A man throws an object weighing 500 g vertically upwards with a velocity of 10 m/s 1. Find its initial momentum 2. Find its momentum at the highest point of flight

Answer»

A man throws an object weighing 500 g vertically upwards with a velocity of 10 m/s

1. Find its initial momentum

2. Find its momentum at the highest point of flight

Discussion

1729.	How does the speed of light is increased in optical fibers
Answer» How does the speed of light is increased in optical fibers

Discussion

1730.	If n balls hit elastically and normally on a surface per unit time and all balls of mass m are moving with same velocity u then force on surface is
Answer» If n balls hit elastically and normally on a surface per unit time and all balls of mass m are moving with same velocity u then force on surface is

Discussion

1731.	Question 16 Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth =6×1024 kg and of the Sun =2×1030 kg. The average distance between the two is 1.5×1011 m
Answer» Question 16 Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth $= 6 \times 10^{24}$ kg and of the Sun $= 2 \times 10^{30}$ kg. The average distance between the two is $1.5 \times 10^{11} m$

Discussion

1732.	If a body has to be pushed along positive X-axis, then in which direction the force should be applied?
Answer» If a body has to be pushed along positive X-axis, then in which direction the force should be applied?

Discussion

1733.	Two bulbs A and B are connected through switches S1 and S2 as shown. Which of the following statement is true:
Answer» Two bulbs A and B are connected through switches $S_{1}$ and $S_{2}$ as shown. Which of the following statement is true:

1733.

Two bulbs A and B are connected through switches S1 and S2 as shown. Which of the following statement is true:

Answer»

Two bulbs A and B are connected through switches $S_{1}$ and $S_{2}$ as shown. Which of the following statement is true:

Discussion

1734.	A solid sphere of radius r made of a soft material of bulk modulus K is surrounded by a liquid in a cylindrical container. A massless piston of area a floats on the surface of the liquid, covering the entire crosssection of the cyindrical container. When a mass m is placed on the surface of the piston to compress the liquid, the fractional decrement in the radius of the sphere, (drr) is
Answer» A solid sphere of radius $r$ made of a soft material of bulk modulus $K$ is surrounded by a liquid in a cylindrical container. A massless piston of area $a$ floats on the surface of the liquid, covering the entire crosssection of the cyindrical container. When a mass $m$ is placed on the surface of the piston to compress the liquid, the fractional decrement in the radius of the sphere, $(\frac{d r}{r})$ is

Discussion

1735.	The velocity-time graph of a body is given below. The maximum acceleration in ms–2 is
Answer» The velocity-time graph of a body is given below. The maximum acceleration in $m s^{- 2}$ is

Discussion

1736.	127.if a person is 6 foot tall then how much tall plane mirror he should take to get his full image.Explain with diagram?
Answer» 127.if a person is 6 foot tall then how much tall plane mirror he should take to get his full image.Explain with diagram?

Discussion

1737.	A liquid of mass m and radius r is falling from great height. It's velocity is proportional to 1) m upon r 2) m upon r square 3)m upon r cube 4) m upon r power 4
Answer» A liquid of mass m and radius r is falling from great height. It's velocity is proportional to 1) m upon r 2) m upon r square 3)m upon r cube 4) m upon r power 4

Discussion

1738.	A car moving with initial velocity of 15 ms−1 accelerates at the rate of 4 ms−2. What is the final velocity of the car after 10 s?
Answer» A car moving with initial velocity of $15 m s^{- 1}$ accelerates at the rate of $4 m s^{- 2}$ . What is the final velocity of the car after $10 s$ ?

Discussion

1739.	A ball is dropped from a height of 15m and gets embedded in sand 1m and stops. Then, 1. Only momentum is conserved2. Only kinetic energy is conserved 3. Both momentum and kinetic energy are conserved4. Neither momentum nor kinetic energy is conserved
Answer» A ball is dropped from a height of 15m and gets embedded in sand 1m and stops. Then, 1. Only momentum is conserved 2. Only kinetic energy is conserved 3. Both momentum and kinetic energy are conserved 4. Neither momentum nor kinetic energy is conserved

Discussion

1740.	A swimmer swims in a 90 m long pool. He covers the distance of 180 m by swimming from one end to other end and back along the same path. If he covers the first 90 m at a speed of 2 ms−1, then how fast does he swim such that his average speed is 3 ms−1?
Answer» A swimmer swims in a $90 m$ long pool. He covers the distance of $180 m$ by swimming from one end to other end and back along the same path. If he covers the first $90 m$ at a speed of $2 m s^{- 1}$ , then how fast does he swim such that his average speed is $3 m s^{- 1}$ ?

Discussion

1741.	46. the gravitation potential doffrence between the surface of planet and apoint 20 m above it is 16 j/ Kg. calculate the work done in moving a 4kg body by 8 m slope of 60 degree from the jorizontal.
Answer» 46. the gravitation potential doffrence between the surface of planet and apoint 20 m above it is 16 j/ Kg. calculate the work done in moving a 4kg body by 8 m slope of 60 degree from the jorizontal.

Discussion

1742.	Rain is falling verticalay downward at a velocity of 12 km h and man is running along south on horizontal road at 5kmh.the velocity of rain wrt man is
Answer» Rain is falling verticalay downward at a velocity of 12 km h and man is running along south on horizontal road at 5kmh.the velocity of rain wrt man is

Discussion

1743.	17. A: A body can have acceleration even if itsvelocity is zero at a given instant of time.R: A body is momentarily at rest when it reversesits direction of motion.
Answer» 17. A: A body can have acceleration even if itsvelocity is zero at a given instant of time.R: A body is momentarily at rest when it reversesits direction of motion.

Discussion

1744.	a block of mass 750g occupies a volume of 250cm^3 .the relative density of the block is
Answer» a block of mass 750g occupies a volume of 250cm^3 .the relative density of the block is

Discussion

1745.	The wavelength of a sound wave is 40 cm and the time period is 0.0005 s. How many seconds will it take to travel a distance of 4 km?
Answer» The wavelength of a sound wave is $40 c m$ and the time period is $0.0005 s$ . How many seconds will it take to travel a distance of $4 k m$ ?

Discussion

1746.	A wooden slab, starting from rest, slides down an inclined plane of length 10m with an acceleration of 5m/s^2. What would be it's speed at the bottom of inclined plane?
Answer» A wooden slab, starting from rest, slides down an inclined plane of length 10m with an acceleration of 5m/s^2. What would be it's speed at the bottom of inclined plane?

Discussion

1747.	A SONAR station observes 25% increase in frequency of wave. If C is the speed of sound in water then speed of submarine is
Answer» A SONAR station observes 25% increase in frequency of wave. If C is the speed of sound in water then speed of submarine is

Discussion

1748.	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

1749.	37. A ball is dropped from top of a tower 250 m high.At the same time, another ball is thrown upwardswith a velocity of 50 ms-1 from the ground. Thetime at which they cross each other is(1) 3 secondA2) 5 second(3) 10 second(4) 12 second
Answer» 37. A ball is dropped from top of a tower 250 m high.At the same time, another ball is thrown upwardswith a velocity of 50 ms-1 from the ground. Thetime at which they cross each other is(1) 3 secondA2) 5 second(3) 10 second(4) 12 second

Discussion

1750.	A force of magnitude 35 N acting on a body of mass 4 kg increases its kinetic energy from 0 J to 210 J. The displacement of the body during this interval is___.
Answer» A force of magnitude 35 N acting on a body of mass 4 kg increases its kinetic energy from 0 J to 210 J. The displacement of the body during this interval is___.

Discussion

Explore topic-wise InterviewSolutions in .

Question 2Explain the meaning of malleable and ductile.

Why is 1 coulomb defined in a vacuum?

question : Relate 1 Angstrom to nanometre

Which of the following statements is true?

6.why does the mud on the wheels of the moving vehicle flies tangentially

What we have do to save natural?

In a hydraulic machine, the two pistons are of the area of cross-section in the ratio 1 : 20. What force is needed on the narrow piston to overcome a force of 200 N on the wider piston?

Four students have made the following circuit diagrams for determining the equivalent resistance of two resistors connected in series:The correct circuit diagram is :(1) A(2) B(3) C(4) D

Define reference point

Establish the relation-V= ωr, where V= Linear speed, (ω)=angular speed, r= radius of the circular path

The potential difference applied to an X-ray tube is 5 kV and the current flowing through it is 3.2 mA. Then what is the number of electrons striking the target per second? [The charge of one electron is e=−1.6×10−19 C]

Two planets have radii r1 and r2 and densities d1 and d2 respectively. The ratio of the acceleration due to gravity on them will be

Which force is responsible for the earth to revolve around the sun ?

Calculate the escape velocity (in km s−1) of Neptune. The mass of Neptune ≈1026 kg, radius of Neptune, ≈24,170 km23.5

An object thrown vertically up from the ground passes the height 5 m twice in an interval of 10 s. What is its time of flight?(1) √28 s

Final velocity of an object under free fall

Coatings used on raincoat are waterproof because

21.a flywheel of moment of inertia 2kgm/s square is rotated at a speed of 30rad/s. a tangential force at the rim stops the wheel in 15seconds . Average torque of the force is??

The measure of mass and volume of a body are 2.00g and 5.0cm3respectively, with possible errors of 0.01g and 0.1cm3. What would be the maximum permissible error in its density?

When an object is placed between the pole and the focus of a concave mirror, what can you say about the magnification?

A body floats with one- third of its volume outside the water. In another liquid , it floats with one- fourth of its volume inside the liquid. If density of water is 1 g/cc , then find the density of liquid

A passenger sitting in a train and facing towards the direction of its motion tosses a coin which falls behind him. This shows that the motion of train is

Q.36 Two solid conductors are made up of same material and same resistance . one of them has a circular cross section area A1 and the other one has a square cross section of area A2 .the ratio of A1/A2 is

moving in a constant acceleration a particle 's travelling distance in t-th second is s=3+2t ,then what was the initial velocity of that particle?

What is the role of decomposers in the ecosystem? [2 MARKS]

निम्नलिखितप्रश्न का उत्तर(25-30 शब्दोंमें)लिखिए−सआदतअली कौन था?उसनेवज़ीर अली कीपैदाइश को अपनीमौत क्यों समझा?

A man throws an object weighing 500 g vertically upwards with a velocity of 10 m/s 1. Find its initial momentum 2. Find its momentum at the highest point of flight

How does the speed of light is increased in optical fibers

If n balls hit elastically and normally on a surface per unit time and all balls of mass m are moving with same velocity u then force on surface is

Question 16 Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth =6×1024 kg and of the Sun =2×1030 kg. The average distance between the two is 1.5×1011 m

If a body has to be pushed along positive X-axis, then in which direction the force should be applied?

Two bulbs A and B are connected through switches S1 and S2 as shown. Which of the following statement is true:

The velocity-time graph of a body is given below. The maximum acceleration in ms–2 is

127.if a person is 6 foot tall then how much tall plane mirror he should take to get his full image.Explain with diagram?

A liquid of mass m and radius r is falling from great height. It's velocity is proportional to 1) m upon r 2) m upon r square 3)m upon r cube 4) m upon r power 4

A car moving with initial velocity of 15 ms−1 accelerates at the rate of 4 ms−2. What is the final velocity of the car after 10 s?

A ball is dropped from a height of 15m and gets embedded in sand 1m and stops. Then, 1. Only momentum is conserved2. Only kinetic energy is conserved 3. Both momentum and kinetic energy are conserved4. Neither momentum nor kinetic energy is conserved

A swimmer swims in a 90 m long pool. He covers the distance of 180 m by swimming from one end to other end and back along the same path. If he covers the first 90 m at a speed of 2 ms−1, then how fast does he swim such that his average speed is 3 ms−1?

46. the gravitation potential doffrence between the surface of planet and apoint 20 m above it is 16 j/ Kg. calculate the work done in moving a 4kg body by 8 m slope of 60 degree from the jorizontal.

Rain is falling verticalay downward at a velocity of 12 km h and man is running along south on horizontal road at 5kmh.the velocity of rain wrt man is

17. A: A body can have acceleration even if itsvelocity is zero at a given instant of time.R: A body is momentarily at rest when it reversesits direction of motion.

a block of mass 750g occupies a volume of 250cm^3 .the relative density of the block is

The wavelength of a sound wave is 40 cm and the time period is 0.0005 s. How many seconds will it take to travel a distance of 4 km?

A wooden slab, starting from rest, slides down an inclined plane of length 10m with an acceleration of 5m/s^2. What would be it's speed at the bottom of inclined plane?

A SONAR station observes 25% increase in frequency of wave. If C is the speed of sound in water then speed of submarine is

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

37. A ball is dropped from top of a tower 250 m high.At the same time, another ball is thrown upwardswith a velocity of 50 ms-1 from the ground. Thetime at which they cross each other is(1) 3 secondA2) 5 second(3) 10 second(4) 12 second

A force of magnitude 35 N acting on a body of mass 4 kg increases its kinetic energy from 0 J to 210 J. The displacement of the body during this interval is___.