13232 + Interview Questions in Physics Page 64 InterviewSolution

3151.	In a swimming pool of 75 m track length, what will be the net displacement of a swimmer after completing a 225 m race?
Answer» In a swimming pool of $75 m$ track length, what will be the net displacement of a swimmer after completing a $225 m$ race?

Discussion

3152.	(1) Calculate relative density of a metal having density 10.8 × 103 kg/m3 if density of water is 103 kg/m3. [Ans : 10.8](2) A force of 1000 N is applied over an area 50 cm × 20 cm. What is the pressure acting at the bottom? [Ans : 10000 N/m2]
Answer» (1) Calculate relative density of a metal having density 10.8 × 10³kg/m³if density of water is 10³kg/m³. [Ans : 10.8] (2) A force of 1000 N is applied over an area 50 cm × 20 cm. What is the pressure acting at the bottom? [Ans : 10000 N/m²]

3152.

(1) Calculate relative density of a metal having density 10.8 × 103 kg/m3 if density of water is 103 kg/m3. [Ans : 10.8](2) A force of 1000 N is applied over an area 50 cm × 20 cm. What is the pressure acting at the bottom? [Ans : 10000 N/m2]

Answer»

(1) Calculate relative density of a metal having density 10.8 × 10³kg/m³if density of water is 10³kg/m³. [Ans : 10.8]

(2) A force of 1000 N is applied over an area 50 cm × 20 cm. What is the pressure acting at the bottom? [Ans : 10000 N/m²]

Discussion

3153.	Q 13/15 A mass of 10 g moving with a velocity of100 cm/s strikes a pendulum bob of mass 10 g. Thetwo masses stick together. The maximum heightreached by the system now is (g 10 m/s2)
Answer» Q 13/15 A mass of 10 g moving with a velocity of100 cm/s strikes a pendulum bob of mass 10 g. Thetwo masses stick together. The maximum heightreached by the system now is (g 10 m/s2)

Discussion

3154.	Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.
Answer» Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Discussion

3155.	What would be the relation between magnitude of velocity of the gun and bullet after firing, if the mass of gun is less than the mass of bullet? Assume no external force is acting on the gun bullet system.
Answer» What would be the relation between magnitude of velocity of the gun and bullet after firing, if the mass of gun is less than the mass of bullet? Assume no external force is acting on the gun bullet system.

Discussion

3156.	When a potential difference is applied across the resistor, the movement of electrons will be:
Answer» When a potential difference is applied across the resistor, the movement of electrons will be:

Discussion

3157.	Prove that if an object is thrown vertically upward, the time of asset is equal to time of disset.
Answer» Prove that if an object is thrown vertically upward, the time of asset is equal to time of disset.

Discussion

3158.	At what altitude (h) above the earth's surface would the acceleration due to gravity be one fourth of its value at the earth's surface?
Answer» At what altitude (h) above the earth's surface would the acceleration due to gravity be one fourth of its value at the earth's surface?

Discussion

3159.	The lever of the _______ order, where the fulcrum is at one end of the lever and power at the other end with the weight in between, is represented by the gastrocnemius muscle raising the weight of the body on the toes.
Answer» The lever of the _______ order, where the fulcrum is at one end of the lever and power at the other end with the weight in between, is represented by the gastrocnemius muscle raising the weight of the body on the toes.

3159.

The lever of the _______ order, where the fulcrum is at one end of the lever and power at the other end with the weight in between, is represented by the gastrocnemius muscle raising the weight of the body on the toes.

Answer»

The lever of the _______ order, where the fulcrum is at one end of the lever and power at the other end with the weight in between, is represented by the gastrocnemius muscle raising the weight of the body on the toes.

Discussion

3160.	Complete the equation for the following fission process92U235+0n1→ 38Sr90+_____
Answer» Complete the equation for the following fission process $_{92} U^{235} +_{0} n^{1} \to_{38} {Sr}^{90} +_____$

Discussion

3161.	Chinawares are wrapped in bubble wrap or paper. Why?
Answer» Chinawares are wrapped in bubble wrap or paper. Why?

Discussion

3162.	Mention the term defined by the following sentence:The mass of a given volume of gas compared to the mass of an equal volume of hydrogen.
Answer» Mention the term defined by the following sentence: The mass of a given volume of gas compared to the mass of an equal volume of hydrogen.

Discussion

3163.	The value of the universal gravitational constant is .
Answer» The value of the universal gravitational constant is .

Discussion

3164.	9. a ball is thrown vertically upwards with a velocity of 25m/s. If g=10m/s then calculate 1-height it reaches 2-time taken to return back
Answer» 9. a ball is thrown vertically upwards with a velocity of 25m/s. If g=10m/s then calculate 1-height it reaches 2-time taken to return back

Discussion

3165.	A mirror forms an image which is 30 cm from an object and twice its height. (a) Where must the mirror be situated? (b) What is the radius of curvature? (c) Is the mirror convex or concave?
Answer» A mirror forms an image which is 30 cm from an object and twice its height. (a) Where must the mirror be situated? (b) What is the radius of curvature? (c) Is the mirror convex or concave?

Discussion

3166.	Which is the hottest part in the flame of a candle?
Answer» Which is the hottest part in the flame of a candle?

Discussion

3167.	Formula if centripetal force is mv²/r. Here if we have to find this force between earth and moon , here r will be what? Will it be radius of earth or distance between radius of earth to radius of moon or something else
Answer» Formula if centripetal force is mv²/r. Here if we have to find this force between earth and moon , here r will be what? Will it be radius of earth or distance between radius of earth to radius of moon or something else

Discussion

3168.	32.A particle moves in the plane xy with constant acceleration w directed along the negative y axis . the equation of motion of the particle has the form y= ax- bx2,where a and b are positive constants.find the velocity of the particle at the origin of coordinates.
Answer» 32.A particle moves in the plane xy with constant acceleration w directed along the negative y axis . the equation of motion of the particle has the form y= ax- bx2,where a and b are positive constants.find the velocity of the particle at the origin of coordinates.

Discussion

3169.

From the given data, find the average speed of a car in km/hr Distance Time 0-100 km 2 hours 100-350 km 6 hours 350-480 km 4 hours

Answer»

From the given data, find the average speed of a car in $k m / h r$

Distance	Time
0-100 km	2 hours
100-350 km	6 hours
350-480 km	4 hours

Discussion

3170.	Difference between centrifugal and centripetal force
Answer» Difference between centrifugal and centripetal force

Discussion

3171.	What is the wavelength of visible spectrum of light?
Answer» What is the wavelength of visible spectrum of light?

Discussion

3172.	A body of mass 2 kg starts from rest and moves with uniform acceleration. It acquires a velocity of 20 m/s in 4 seconds.The power exerted on the body in 2 seconds is
Answer» A body of mass 2 kg starts from rest and moves with uniform acceleration. It acquires a velocity of 20 m/s in 4 seconds.The power exerted on the body in 2 seconds is

Discussion

3173.	A man generates a symmetrical pulse in a string by moving his hand up and down. At t=0 the point in his hand moves downward from mean positoon. The pulse travels with speed of 3 m/s on the string and his hand passes 6 times in each second from the mean position. Then the point on the string at a distance 3 m will reach its upper extreme first time at time t=n/12. Then find n?
Answer» A man generates a symmetrical pulse in a string by moving his hand up and down. At t=0 the point in his hand moves downward from mean positoon. The pulse travels with speed of 3 m/s on the string and his hand passes 6 times in each second from the mean position. Then the point on the string at a distance 3 m will reach its upper extreme first time at time t=n/12. Then find n?

Discussion

3174.	When an object of height 3 cm is placed at a distance of 30 cm from a lens, a real image is formed at a distance of 60 cm. Find out the height of the object.
Answer» When an object of height 3 cm is placed at a distance of 30 cm from a lens, a real image is formed at a distance of 60 cm. Find out the height of the object.

Discussion

3175.	Question 19A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g=10 ms−2)
Answer» Question 19 A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? $(g = 10 m s^{- 2})$

Discussion

3176.	We know that a magnetic force produced when the the charges are in motion. But when a natural magnet produces its magnetic force then is the charges which are in natural magnet are in motion?
Answer» We know that a magnetic force produced when the the charges are in motion. But when a natural magnet produces its magnetic force then is the charges which are in natural magnet are in motion?

Discussion

3177.	A wire is bent in the shape of a right-angled triangle and is placed in front of a concave mirror of focal length f, as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)?
Answer» A wire is bent in the shape of a right-angled triangle and is placed in front of a concave mirror of focal length f, as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)?

Discussion

3178.	A thin square plate of side 4 m is placed horizontally 2 m below the surface of water. Calculate the thrust on one of the surface of the plate.(Given: Atmospheric pressure,Patm=1.013×105N/m2Density of water, ρw = 1000 kg/m3,Acceleration due to gravity, (g)=9.8 ms−1)
Answer» A thin square plate of side $4 m$ is placed horizontally $2 m$ below the surface of water. Calculate the thrust on one of the surface of the plate. (Given: Atmospheric pressure, $P_{a t m} = 1.013 \times 10^{5} N / m^{2}$ Density of water, $ρ_{w}$ = $1000 k g / m^{3}$ , Acceleration due to gravity, $(g) = 9.8 m s^{- 1}$ )

Discussion

3179.	24. If modulation index is 1/2 and power of carrier wave is 2w. then what will be the total power in modulated wave ? a) 0.5w b) 1w c)0.25w c)2.25w
Answer» 24. If modulation index is 1/2 and power of carrier wave is 2w. then what will be the total power in modulated wave ? a) 0.5w b) 1w c)0.25w c)2.25w

Discussion

3180.	80.The hydrostatic pressure 'P' of a liquid column depends upon the density 'd', height 'h' of liquid column and also acceleration 'g' due to gravity. Using dimensional , derive formula for pressure P .
Answer» 80.The hydrostatic pressure 'P' of a liquid column depends upon the density 'd', height 'h' of liquid column and also acceleration 'g' due to gravity. Using dimensional , derive formula for pressure P .

Discussion

3181.	archmidies principals
Answer» archmidies principals

Discussion

3182.	A man is standing between 2 cliffs A & B. Given: tA=1.2s, tB=3.6s, Speed of sound=360m/s, dA=216m, dB=648m. Find the time when he hears the 3rd echo.
Answer» A man is standing between 2 cliffs A & B. Given: tA=1.2s, tB=3.6s, Speed of sound=360m/s, dA=216m, dB=648m. Find the time when he hears the 3rd echo.

Discussion

3183.	Among the following materials mentioned below which will not be attracted by the magnet?
Answer» Among the following materials mentioned below which will not be attracted by the magnet?

Discussion

3184.	What is the purpose of parachutes used by skydivers?
Answer» What is the purpose of parachutes used by skydivers?

Discussion

3185.	A block of mass M is pulled along a horizontal frictionless suface by a rope of mass m. If a force F is applied at the free end of the rope, the net force exerted on the block will be
Answer» A block of mass M is pulled along a horizontal frictionless suface by a rope of mass m. If a force F is applied at the free end of the rope, the net force exerted on the block will be

Discussion

3186.	A bird is flying along a straight line with velocity v=(4-t)m/s. The dis†an ce travelled by bird in first 5s is-1)7.5m,2)8m,3)8.5m,4)10.5
Answer» A bird is flying along a straight line with velocity v=(4-t)m/s. The dis†an ce travelled by bird in first 5s is-1)7.5m,2)8m,3)8.5m,4)10.5

Discussion

3187.	A man of mass m is suspended in air by holding the rope of a balloon of mass M . As the man climbs up the rope , the balloon moves downward .In this case , won't gravitational force act as an external force ?
Answer» A man of mass m is suspended in air by holding the rope of a balloon of mass M . As the man climbs up the rope , the balloon moves downward . In this case , won't gravitational force act as an external force ?

Discussion

3188.	A train is traveling at a speed of 72km\hr and passe a pole in 3s find the time taken to cover 540m
Answer» A train is traveling at a speed of 72km\hr and passe a pole in 3s find the time taken to cover 540m

Discussion

3189.	32.Calculate the surface energy of ring floating on the liquid surface .surface tension of liquid is 75n/m and the area of the ring is 0.04msq
Answer» 32.Calculate the surface energy of ring floating on the liquid surface .surface tension of liquid is 75n/m and the area of the ring is 0.04msq

Discussion

3190.	A 10 MVA, 13.8 kV alternator has positive, negative and zero sequence reactances of 30%, 40% and 5% respectively. The value of resistance that must be placed in the generator neutral so that the fault current for a LG fault of zero fault impedance will not exceed the rated line current is ________Ω.18.43
Answer» A 10 MVA, 13.8 kV alternator has positive, negative and zero sequence reactances of 30%, 40% and 5% respectively. The value of resistance that must be placed in the generator neutral so that the fault current for a LG fault of zero fault impedance will not exceed the rated line current is ________ $Ω$ . 18.43

Discussion

3191.	Represent graphically the variation of momentum in two objects. i. If they have equal mass m but moving with different velocities(i.e)V_{1 }> V_2 ii. If they have different masses but moving with same velocity(i.e)M_{1 }>M_2
Answer» Represent graphically the variation of momentum in two objects. i. If they have equal mass m but moving with different velocities(i.e)V_{1 }> V_2 ii. If they have different masses but moving with same velocity(i.e)M_{1 }>M_2

Discussion

3192.	51.In the situation shown ,the potential difference across the cell of smaller emf is
Answer» 51.In the situation shown ,the potential difference across the cell of smaller emf is

Discussion

3193.	The image obtained by a mirror is erect and of the same size as that of the object. What type of mirror has been used?
Answer» The image obtained by a mirror is erect and of the same size as that of the object. What type of mirror has been used?

Discussion

3194.	ntA particle moves with constant acceleration. If v1, v2 and v3 are the three velocities in three successive intervals t1,t2 and t3 of time , then prove that v1-v2/v2-v3 = t1+t2/t2+t3.n
Answer» ntA particle moves with constant acceleration. If v1, v2 and v3 are the three velocities in three successive intervals t1,t2 and t3 of time , then prove that v1-v2/v2-v3 = t1+t2/t2+t3.n

Discussion

3195.	An object of mass m is floating in liquid of densityσ.If the object is made up of density ρ,then apparent weight of the object in the liquid is mg(-/)
Answer» An object of mass m is floating in liquid of densityσ.If the object is made up of density ρ,then apparent weight of the object in the liquid is mg(-/)

Discussion

3196.	A scooterist covers a distance of 3 kilometers in 5 minutes. Calculate his speed in :centimeters per second (cm/s)
Answer» A scooterist covers a distance of $3$ kilometers in $5$ minutes. Calculate his speed in : centimeters per second (cm/s)

Discussion

3197.	What are the factors on which pressure depends
Answer» What are the factors on which pressure depends

Discussion

3198.	Scientists had heavy work pressure but they were loyal.
Answer» Scientists had heavy work pressure but they were loyal.

Discussion

3199.	An ant drags a piece of sweet from the origin (0,0) to (3,4) in the co-ordinate axes. What is the work done by the ant if it applies a force of 1 N? (1 unit on the coordinate axis = 1 metre)
Answer» An ant drags a piece of sweet from the origin (0,0) to (3,4) in the co-ordinate axes. What is the work done by the ant if it applies a force of 1 N? (1 unit on the coordinate axis = 1 metre)

Discussion

3200.	is cathode negative terminal or positive terminal?why it is different in electrolytic and galvanic cell?how to identify?
Answer» is cathode negative terminal or positive terminal? why it is different in electrolytic and galvanic cell? how to identify?

Discussion

Explore topic-wise InterviewSolutions in .

In a swimming pool of 75 m track length, what will be the net displacement of a swimmer after completing a 225 m race?

(1) Calculate relative density of a metal having density 10.8 × 103 kg/m3 if density of water is 103 kg/m3. [Ans : 10.8](2) A force of 1000 N is applied over an area 50 cm × 20 cm. What is the pressure acting at the bottom? [Ans : 10000 N/m2]

Q 13/15 A mass of 10 g moving with a velocity of100 cm/s strikes a pendulum bob of mass 10 g. Thetwo masses stick together. The maximum heightreached by the system now is (g 10 m/s2)

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

What would be the relation between magnitude of velocity of the gun and bullet after firing, if the mass of gun is less than the mass of bullet? Assume no external force is acting on the gun bullet system.

When a potential difference is applied across the resistor, the movement of electrons will be:

Prove that if an object is thrown vertically upward, the time of asset is equal to time of disset.

At what altitude (h) above the earth's surface would the acceleration due to gravity be one fourth of its value at the earth's surface?

The lever of the _______ order, where the fulcrum is at one end of the lever and power at the other end with the weight in between, is represented by the gastrocnemius muscle raising the weight of the body on the toes.

Complete the equation for the following fission process92U235+0n1→ 38Sr90+_____

Chinawares are wrapped in bubble wrap or paper. Why?

Mention the term defined by the following sentence:The mass of a given volume of gas compared to the mass of an equal volume of hydrogen.

The value of the universal gravitational constant is .

9. a ball is thrown vertically upwards with a velocity of 25m/s. If g=10m/s then calculate 1-height it reaches 2-time taken to return back

A mirror forms an image which is 30 cm from an object and twice its height. (a) Where must the mirror be situated? (b) What is the radius of curvature? (c) Is the mirror convex or concave?

Which is the hottest part in the flame of a candle?

Formula if centripetal force is mv²/r. Here if we have to find this force between earth and moon , here r will be what? Will it be radius of earth or distance between radius of earth to radius of moon or something else

32.A particle moves in the plane xy with constant acceleration w directed along the negative y axis . the equation of motion of the particle has the form y= ax- bx2,where a and b are positive constants.find the velocity of the particle at the origin of coordinates.

From the given data, find the average speed of a car in km/hr Distance Time 0-100 km 2 hours 100-350 km 6 hours 350-480 km 4 hours

Difference between centrifugal and centripetal force

What is the wavelength of visible spectrum of light?

A body of mass 2 kg starts from rest and moves with uniform acceleration. It acquires a velocity of 20 m/s in 4 seconds.The power exerted on the body in 2 seconds is

When an object of height 3 cm is placed at a distance of 30 cm from a lens, a real image is formed at a distance of 60 cm. Find out the height of the object.

Question 19A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g=10 ms−2)

We know that a magnetic force produced when the the charges are in motion. But when a natural magnet produces its magnetic force then is the charges which are in natural magnet are in motion?

A wire is bent in the shape of a right-angled triangle and is placed in front of a concave mirror of focal length f, as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)?

A thin square plate of side 4 m is placed horizontally 2 m below the surface of water. Calculate the thrust on one of the surface of the plate.(Given: Atmospheric pressure,Patm=1.013×105N/m2Density of water, ρw = 1000 kg/m3,Acceleration due to gravity, (g)=9.8 ms−1)

24. If modulation index is 1/2 and power of carrier wave is 2w. then what will be the total power in modulated wave ? a) 0.5w b) 1w c)0.25w c)2.25w

80.The hydrostatic pressure 'P' of a liquid column depends upon the density 'd', height 'h' of liquid column and also acceleration 'g' due to gravity. Using dimensional , derive formula for pressure P .

archmidies principals

A man is standing between 2 cliffs A & B. Given: tA=1.2s, tB=3.6s, Speed of sound=360m/s, dA=216m, dB=648m. Find the time when he hears the 3rd echo.

Among the following materials mentioned below which will not be attracted by the magnet?

What is the purpose of parachutes used by skydivers?

A block of mass M is pulled along a horizontal frictionless suface by a rope of mass m. If a force F is applied at the free end of the rope, the net force exerted on the block will be

A bird is flying along a straight line with velocity v=(4-t)m/s. The dis†an ce travelled by bird in first 5s is-1)7.5m,2)8m,3)8.5m,4)10.5

A man of mass m is suspended in air by holding the rope of a balloon of mass M . As the man climbs up the rope , the balloon moves downward .In this case , won't gravitational force act as an external force ?

A train is traveling at a speed of 72km\hr and passe a pole in 3s find the time taken to cover 540m

32.Calculate the surface energy of ring floating on the liquid surface .surface tension of liquid is 75n/m and the area of the ring is 0.04msq

Represent graphically the variation of momentum in two objects. i. If they have equal mass m but moving with different velocities(i.e)V_{1 }> V_2 ii. If they have different masses but moving with same velocity(i.e)M_{1 }>M_2

51.In the situation shown ,the potential difference across the cell of smaller emf is

The image obtained by a mirror is erect and of the same size as that of the object. What type of mirror has been used?

ntA particle moves with constant acceleration. If v1, v2 and v3 are the three velocities in three successive intervals t1,t2 and t3 of time , then prove that v1-v2/v2-v3 = t1+t2/t2+t3.n

An object of mass m is floating in liquid of densityσ.If the object is made up of density ρ,then apparent weight of the object in the liquid is mg(-/)

A scooterist covers a distance of 3 kilometers in 5 minutes. Calculate his speed in :centimeters per second (cm/s)

What are the factors on which pressure depends

Scientists had heavy work pressure but they were loyal.

An ant drags a piece of sweet from the origin (0,0) to (3,4) in the co-ordinate axes. What is the work done by the ant if it applies a force of 1 N? (1 unit on the coordinate axis = 1 metre)

is cathode negative terminal or positive terminal?why it is different in electrolytic and galvanic cell?how to identify?