13232 + Interview Questions in Physics Page 22 InterviewSolution

1051.	The pitch of a screw gauge is 1 mm with 100 CSD. In measurement of thickness of a wire, there are 3 divisions on linear scale and 25 divisions on circular scale coinciding with reference line. If nothing is put between the studs then 20^th division of circular scale is coinciding with reference line such that zero of linear scale is visible, then thickness of wire is
Answer» The pitch of a screw gauge is 1 mm with 100 CSD. In measurement of thickness of a wire, there are 3 divisions on linear scale and 25 divisions on circular scale coinciding with reference line. If nothing is put between the studs then 20^th division of circular scale is coinciding with reference line such that zero of linear scale is visible, then thickness of wire is

Discussion

1052.	A particle having charge q and mass m enters a uniform magnetic field B as shown thedisplacement of the particle in the field is
Answer» A particle having charge q and mass m enters a uniform magnetic field B as shown thedisplacement of the particle in the field is

Discussion

1053.	One of Saturn's moon is named as Mimas. The orbital distance of Mimas is 1.87×108 m from Saturn. The mean orbital period of Mimas is approximately 23 hours. Calculate the speed of Mimas with which it revolves around Saturn. Assume the path of the moon to be perfectly circular.
Answer» One of Saturn's moon is named as Mimas. The orbital distance of Mimas is $1.87 \times 10^{8} m$ from Saturn. The mean orbital period of Mimas is approximately 23 hours. Calculate the speed of Mimas with which it revolves around Saturn. Assume the path of the moon to be perfectly circular.

Discussion

1054.	The energy source for decomposers are ___ in the environment.
Answer» The energy source for decomposers are ___ in the environment.

Discussion

1055.	Prove that uniform circular motion is an accelerated motion.
Answer» Prove that uniform circular motion is an accelerated motion.

Discussion

1056.	When two different stones of masses 1 kg and 2 kg are taken to the same heights, then:
Answer» When two different stones of masses $1 kg$ and $2 kg$ are taken to the same heights, then:

Discussion

1057.	3.Two car A andB are racing along straight line. Car A is leading ,such that their relative velocity is directly proportional to the distance between two cars. When the lead of car A is l1= 10m ,its running 10m/s faster than carB. Determine the carA will take to increase its lead to l2 = 20m from caarB
Answer» 3.Two car A andB are racing along straight line. Car A is leading ,such that their relative velocity is directly proportional to the distance between two cars. When the lead of car A is l1= 10m ,its running 10m/s faster than carB. Determine the carA will take to increase its lead to l2 = 20m from caarB

Discussion

1058.	Area under velocity-time graph gives:
Answer» Area under velocity-time graph gives:

Discussion

1059.	An aluminium rod and a copper rod of length 1.0 m and cross-sectional area 1 cm2 each, are welded together as shown in figure. One end of this composite rod is kept at a temperature of 20∘C, while the other end is at 60∘C. Calculate the amount of heat taken out per second from the hot end. Thermal conductivity of aluminium =200 W/m∘C and that of copper =300 W/m∘C
Answer» An aluminium rod and a copper rod of length $1.0 m$ and cross-sectional area $1 {cm}^{2}$ each, are welded together as shown in figure. One end of this composite rod is kept at a temperature of $20^{\circ} C$ , while the other end is at $60^{\circ} C$ . Calculate the amount of heat taken out per second from the hot end. Thermal conductivity of aluminium $= 200 {W/m}^{\circ} C$ and that of copper $= 300 {W/m}^{\circ} C$

Discussion

1060.	Two friends were going for a short tour and on the way the car suddenly stopped.Both of them managed to push the car of mass 1100 kg at a uniform velocity along a level road. In the mean time a villager came to help them and the same car was now pushed by three persons at an acceleration of 0.2 m/s^2 (i)Which value of the villager is promoted here? (ii)With what force these three persons pushed the car?
Answer» Two friends were going for a short tour and on the way the car suddenly stopped.Both of them managed to push the car of mass 1100 kg at a uniform velocity along a level road. In the mean time a villager came to help them and the same car was now pushed by three persons at an acceleration of 0.2 m/s^2 (i)Which value of the villager is promoted here? (ii)With what force these three persons pushed the car?

Discussion

1061.	The magnitude of the maximum disturbance in the medium on either side of the mean value is called
Answer» The magnitude of the maximum disturbance in the medium on either side of the mean value is called

Discussion

1062.	Question 1(i)The following graph shows the temperature of a patient in a hospital, recorded every hourWhat was the patient’s temperature at 1 p.m.?
Answer» Question 1(i) The following graph shows the temperature of a patient in a hospital, recorded every hour What was the patient’s temperature at 1 p.m.?

Discussion

1063.	The angular velocity of the particle moving in a circle of a radius 50cm,is increased from 100 review per min to 400rev per min in 5 min. Find the tangential acceleration of the particle
Answer» The angular velocity of the particle moving in a circle of a radius 50cm,is increased from 100 review per min to 400rev per min in 5 min. Find the tangential acceleration of the particle

Discussion

1064.	Explain with an example that a body may possess energy even when it is not in motion.
Answer» Explain with an example that a body may possess energy even when it is not in motion.

Discussion

1065.	45.A body of mass m of mass m thrown horizontally with velocity v from the top of tower of height h touches the level ground at a distance of 250m from the foot of the tower . a body of mass 2m thrown with a velocity v/2, from the top of tower of height 4h will touch the level ground at a distance from foot of tower
Answer» 45.A body of mass m of mass m thrown horizontally with velocity v from the top of tower of height h touches the level ground at a distance of 250m from the foot of the tower . a body of mass 2m thrown with a velocity v/2, from the top of tower of height 4h will touch the level ground at a distance from foot of tower

Discussion

1066.	Explain how inertia is used to dust a floormat and to remove water drops from a wet cloth. [3 MARKS]
Answer» Explain how inertia is used to dust a floormat and to remove water drops from a wet cloth. [3 MARKS]

Discussion

1067.	A train first travels for 30 min with a velocity 30km/hr and then for 40min with a velocity for 40km/hr in the same direction. The average velocity of train is
Answer» A train first travels for 30 min with a velocity 30km/hr and then for 40min with a velocity for 40km/hr in the same direction. The average velocity of train is

Discussion

1068.	Question 4What is the quantity which is measured by the area occupied below the velocity-time graph?
Answer» Question 4 What is the quantity which is measured by the area occupied below the velocity-time graph?

Discussion

1069.	Identify free fall situations from the following.
Answer» Identify free fall situations from the following.

Discussion

1070.	A body of cubic shape of side 2 cm is falling in the water. Density of body is =3 g m−3. Find out the value of acceleration of cube. (Density of water, ρw=1 g m−3,g=10000 cm s−2).
Answer» A body of cubic shape of side $2 c m$ is falling in the water. Density of body is $= 3 g m^{- 3}$ . Find out the value of acceleration of cube. (Density of water, $ρ_{w} = 1 g m^{- 3}, g = 10000 c m s^{- 2}$ ).

Discussion

1071.	Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
Answer» Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?

Discussion

1072.	An object of mass 1 kg is at rest. A constant force of 10 N is applied on it for 2 seconds. Find the work done by the force on the object.
Answer» An object of mass $1 k g$ is at rest. A constant force of $10 N$ is applied on it for 2 seconds. Find the work done by the force on the object.

Discussion

1073.	40. From the top of building 200 m in height,a stone is dropped and at same time another stone is projected vertically upwards from the good with a velocity of 40 Ms. The distance from the ground where the 2 stones will meet is
Answer» 40. From the top of building 200 m in height,a stone is dropped and at same time another stone is projected vertically upwards from the good with a velocity of 40 Ms. The distance from the ground where the 2 stones will meet is

Discussion

1074.	Why does an athlete run for a distance before taking a jump?
Answer» Why does an athlete run for a distance before taking a jump?

Discussion

1075.	Derive the relation F=ma.
Answer» Derive the relation F=ma.

Discussion

1076.	A body is dropped from a height h under acceleration due to gravity g. If t1 and t2 are time intervals for its fall for first half and the second half distance , the relation between them is=?
Answer» A body is dropped from a height h under acceleration due to gravity g. If t1 and t2 are time intervals for its fall for first half and the second half distance , the relation between them is=?

Discussion

1077.	what is the direction of current (conventionally and electronically )
Answer» what is the direction of current (conventionally and electronically )

Discussion

1078.	A train is moving with velocity 20m/s. on this ,dust is falling at the rate of 50kg/min. the extra force required to move this train with cons†an t velocity will be
Answer» A train is moving with velocity 20m/s. on this ,dust is falling at the rate of 50kg/min. the extra force required to move this train with cons†an t velocity will be

Discussion

1079.	In practical situations, it is difficult to attain a zero unbalanced force, because of __
Answer» In practical situations, it is difficult to attain a zero unbalanced force, because of __

Discussion

1080.	A particle moving in a straight line covers half distance with speed of 3 m/s . The other half of distance with speed of two equal time intervals with speed 4.5m/s and 7.5m/s respectively. The average speed of tge particle during motion is
Answer» A particle moving in a straight line covers half distance with speed of 3 m/s . The other half of distance with speed of two equal time intervals with speed 4.5m/s and 7.5m/s respectively. The average speed of tge particle during motion is

Discussion

1081.	If the distance between the earth & the sun were half its present value, the number of days in a year would have been
Answer» If the distance between the earth & the sun were half its present value, the number of days in a year would have been

Discussion

1082.	The wavelength of waves produced on the surface of water is 20 cm. If the wave velocity is 24 m s−1, calculate : (i) the number of waves produced in one second, (ii) the time in which one wave is produced.
Answer» The wavelength of waves produced on the surface of water is 20 cm. If the wave velocity is 24 m $s^{- 1}$ , calculate : (i) the number of waves produced in one second, (ii) the time in which one wave is produced.

1082.

The wavelength of waves produced on the surface of water is 20 cm. If the wave velocity is 24 m s−1, calculate : (i) the number of waves produced in one second, (ii) the time in which one wave is produced.

Answer»

The wavelength of waves produced on the surface of water is 20 cm. If the wave velocity is 24 m $s^{- 1}$ , calculate :

(i) the number of waves produced in one second,

(ii) the time in which one wave is produced.

Discussion

1083.	Which of the following is wrong? a) W(external force) =Change in mechanical energy,if workdone by non-conservative forces is zero b.W(Conservative )+W(non-conservative )+ W(external force) =change in kinetic energy c.-Change in potential energy=W(conservative) dMechanical energy of system remainsalways constant
Answer» Which of the following is wrong? a) W(external force) =Change in mechanical energy,if workdone by non-conservative forces is zero b.W(Conservative )+W(non-conservative )+ W(external force) =change in kinetic energy c.-Change in potential energy=W(conservative) dMechanical energy of system remainsalways constant

Discussion

1084.	A body is projected at an angle of 60^° with horizontal with a speed of 40m/s The speed of the body when velocity becomes perpendicular to initial velocity is(g=10m/s² 1.20\surd3m/s 2.40/\surd3m/s 3.20m/s 4.30m/
Answer» A body is projected at an angle of 60^° with horizontal with a speed of 40m/s The speed of the body when velocity becomes perpendicular to initial velocity is(g=10m/s² 1.20\surd3m/s 2.40/\surd3m/s 3.20m/s 4.30m/

Discussion

1085.	ntThe length of a seconds hand in a watch is 1cm.The change in velocity of its tip in 15s is what?n
Answer» ntThe length of a seconds hand in a watch is 1cm.The change in velocity of its tip in 15s is what?n

Discussion

1086.	The mass of sun is 2×1030 kg and the mass of earth is 6×1024 kg. If the average distance between the sun and the earth be 1.5×108km, calculate the force of gravitation between them.
Answer» The mass of sun is $2 \times 10^{30}$ kg and the mass of earth is $6 \times 10^{24}$ kg. If the average distance between the sun and the earth be $1.5 \times 10^{8}$ km, calculate the force of gravitation between them.

Discussion

1087.	Why does a man weigh less on the moon than on the Earth?
Answer» Why does a man weigh less on the moon than on the Earth?

Discussion

1088.	A cyclist covers two rounds of a circular track of radius 7m.calculate the difference between the distance and displacement covered by the cyclist
Answer» A cyclist covers two rounds of a circular track of radius 7m.calculate the difference between the distance and displacement covered by the cyclist

Discussion

1089.	A ball weighing 4kg of density 4000kg/m is completely immersed in water of density 103kg/m find the force of buoyancy on it
Answer» A ball weighing 4kg of density 4000kg/m is completely immersed in water of density 103kg/m find the force of buoyancy on it

Discussion

1090.	What is the difference between friction and inertia? Are they same in some aspect?
Answer» What is the difference between friction and inertia? Are they same in some aspect?

Discussion

1091.	Show that the instantaneous velocity of a particle at any instant is equal to slope of tangent drawn to displacement-time curve at that instant.
Answer» Show that the instantaneous velocity of a particle at any instant is equal to slope of tangent drawn to displacement-time curve at that instant.

Discussion

1092.	The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be
Answer» The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be

1092.

The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be

Answer»

The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be

Discussion

1093.	43.Rain is falling at angle of 37 with vertical with v-10 m/s. Find speed of man with which he should run so that rain appears to falling vertically downward.
Answer» 43.Rain is falling at angle of 37 with vertical with v-10 m/s. Find speed of man with which he should run so that rain appears to falling vertically downward.

Discussion

1094.	ntn ntQ. An object is projected from ground with speed u at angle with horizontal. The radius of curvature of its trajectory at maximum height from the ground isn nt1) u2 sin2/gn nt2) u2 cos2/gn nt3) u2 sin2 /gn nt4) u2 sin2 /2gn
Answer» ntn ntQ. An object is projected from ground with speed u at angle with horizontal. The radius of curvature of its trajectory at maximum height from the ground isn nt1) u2 sin2/gn nt2) u2 cos2/gn nt3) u2 sin2 /gn nt4) u2 sin2 /2gn

Discussion

1095.	A beaker is filled with water to its brim. A child, while playing, drops his ball of mass 1 kg into the beaker and as a result, water spills out. The weight of the spilled water was found it to be 1 N. Find the buoyant force experienced by the ball.
Answer» A beaker is filled with water to its brim. A child, while playing, drops his ball of mass 1 kg into the beaker and as a result, water spills out. The weight of the spilled water was found it to be 1 N. Find the buoyant force experienced by the ball.

Discussion

1096.	Why radiation pressure during complete absorption is I/c while during complete reflection it is 2I/c ??
Answer» Why radiation pressure during complete absorption is I/c while during complete reflection it is 2I/c ??

Discussion

1097.	19.A particle is projected at an angle 45 . The relation between range and maximum height attained by the particle is:
Answer» 19.A particle is projected at an angle 45 . The relation between range and maximum height attained by the particle is:

Discussion

1098.	If seventh harmonic on a string fixed at both ends , how many nodes and internodes are set up in it
Answer» If seventh harmonic on a string fixed at both ends , how many nodes and internodes are set up in it

Discussion

1099.	What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid ? When does the buoyant force become maximum ?
Answer» What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid ? When does the buoyant force become maximum ?

Discussion

1100.	15.A uniform chain of length 'l' and mass 'm' lies on a smooth horizontal table with its length perpendicular to the edge of the table, and a small part overhanging. The chain stars sliding down form rest due to the weight of the hanging part. Find the acceleration and velocity of the chain when length of the hanging potion is 'x'.
Answer» 15.A uniform chain of length 'l' and mass 'm' lies on a smooth horizontal table with its length perpendicular to the edge of the table, and a small part overhanging. The chain stars sliding down form rest due to the weight of the hanging part. Find the acceleration and velocity of the chain when length of the hanging potion is 'x'.

Discussion

Explore topic-wise InterviewSolutions in .

A particle having charge q and mass m enters a uniform magnetic field B as shown thedisplacement of the particle in the field is

One of Saturn's moon is named as Mimas. The orbital distance of Mimas is 1.87×108 m from Saturn. The mean orbital period of Mimas is approximately 23 hours. Calculate the speed of Mimas with which it revolves around Saturn. Assume the path of the moon to be perfectly circular.

The energy source for decomposers are ___ in the environment.

Prove that uniform circular motion is an accelerated motion.

When two different stones of masses 1 kg and 2 kg are taken to the same heights, then:

Area under velocity-time graph gives:

The magnitude of the maximum disturbance in the medium on either side of the mean value is called

Question 1(i)The following graph shows the temperature of a patient in a hospital, recorded every hourWhat was the patient’s temperature at 1 p.m.?

The angular velocity of the particle moving in a circle of a radius 50cm,is increased from 100 review per min to 400rev per min in 5 min. Find the tangential acceleration of the particle

Explain with an example that a body may possess energy even when it is not in motion.

Explain how inertia is used to dust a floormat and to remove water drops from a wet cloth. [3 MARKS]

A train first travels for 30 min with a velocity 30km/hr and then for 40min with a velocity for 40km/hr in the same direction. The average velocity of train is

Question 4What is the quantity which is measured by the area occupied below the velocity-time graph?

Identify free fall situations from the following.

A body of cubic shape of side 2 cm is falling in the water. Density of body is =3 g m−3. Find out the value of acceleration of cube. (Density of water, ρw=1 g m−3,g=10000 cm s−2).

Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?

An object of mass 1 kg is at rest. A constant force of 10 N is applied on it for 2 seconds. Find the work done by the force on the object.

40. From the top of building 200 m in height,a stone is dropped and at same time another stone is projected vertically upwards from the good with a velocity of 40 Ms. The distance from the ground where the 2 stones will meet is

Why does an athlete run for a distance before taking a jump?

Derive the relation F=ma.

A body is dropped from a height h under acceleration due to gravity g. If t1 and t2 are time intervals for its fall for first half and the second half distance , the relation between them is=?

what is the direction of current (conventionally and electronically )

A train is moving with velocity 20m/s. on this ,dust is falling at the rate of 50kg/min. the extra force required to move this train with cons†an t velocity will be

In practical situations, it is difficult to attain a zero unbalanced force, because of __

A particle moving in a straight line covers half distance with speed of 3 m/s . The other half of distance with speed of two equal time intervals with speed 4.5m/s and 7.5m/s respectively. The average speed of tge particle during motion is

If the distance between the earth & the sun were half its present value, the number of days in a year would have been

The wavelength of waves produced on the surface of water is 20 cm. If the wave velocity is 24 m s−1, calculate : (i) the number of waves produced in one second, (ii) the time in which one wave is produced.

A body is projected at an angle of 60^° with horizontal with a speed of 40m/s The speed of the body when velocity becomes perpendicular to initial velocity is(g=10m/s² 1.20\surd3m/s 2.40/\surd3m/s 3.20m/s 4.30m/

ntThe length of a seconds hand in a watch is 1cm.The change in velocity of its tip in 15s is what?n

The mass of sun is 2×1030 kg and the mass of earth is 6×1024 kg. If the average distance between the sun and the earth be 1.5×108km, calculate the force of gravitation between them.

Why does a man weigh less on the moon than on the Earth?

A cyclist covers two rounds of a circular track of radius 7m.calculate the difference between the distance and displacement covered by the cyclist

A ball weighing 4kg of density 4000kg/m is completely immersed in water of density 103kg/m find the force of buoyancy on it

What is the difference between friction and inertia? Are they same in some aspect?

Show that the instantaneous velocity of a particle at any instant is equal to slope of tangent drawn to displacement-time curve at that instant.

The three vessels shown in figure have same base area. Equal volumes of a liquid are poured in three vessels. The force on the base will be

43.Rain is falling at angle of 37 with vertical with v-10 m/s. Find speed of man with which he should run so that rain appears to falling vertically downward.

ntn ntQ. An object is projected from ground with speed u at angle with horizontal. The radius of curvature of its trajectory at maximum height from the ground isn nt1) u2 sin2/gn nt2) u2 cos2/gn nt3) u2 sin2 /gn nt4) u2 sin2 /2gn

A beaker is filled with water to its brim. A child, while playing, drops his ball of mass 1 kg into the beaker and as a result, water spills out. The weight of the spilled water was found it to be 1 N. Find the buoyant force experienced by the ball.

Why radiation pressure during complete absorption is I/c while during complete reflection it is 2I/c ??

19.A particle is projected at an angle 45 . The relation between range and maximum height attained by the particle is:

If seventh harmonic on a string fixed at both ends , how many nodes and internodes are set up in it

What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid ? When does the buoyant force become maximum ?