13232 + Interview Questions in Physics Page 83 InterviewSolution

4101.	45. A light and a heavy object have the same momentum. find the ratio of their kinetic energy. which will have a greater kinetic energy??
Answer» 45. A light and a heavy object have the same momentum. find the ratio of their kinetic energy. which will have a greater kinetic energy??

Discussion

4102.	A locomotive approaching a crossing at a speed of 20m/s sounds a whistle of frequency 640Hz when 1km from the crossing. There is no wind and the speed of sound in air is 330m/s. What frequency is heard by an observer √3km on the straight road from the crossing at right angle. A locomotive approaching a crossing at a speed of 20m/s sounds a whistle of frequency 640Hz when 1km from the crossing. There is no wind and the speed of sound in air is 330m/s. What frequency is heard by an observer √3km on the straight road from the crossing at right angle.
Answer» A locomotive approaching a crossing at a speed of 20m/s sounds a whistle of frequency 640Hz when 1km from the crossing. There is no wind and the speed of sound in air is 330m/s. What frequency is heard by an observer √3km on the straight road from the crossing at right angle. A locomotive approaching a crossing at a speed of 20m/s sounds a whistle of frequency 640Hz when 1km from the crossing. There is no wind and the speed of sound in air is 330m/s. What frequency is heard by an observer √3km on the straight road from the crossing at right angle.

Discussion

4103.	Two wires A and B made of same material and having their lengths in the ratio 6:1 are connected in series. The potential difference across the wire are 3 V and 2 V respectively. If rA and rB are the radii of A and B respectively, then rBrA is
Answer» Two wires $A$ and $B$ made of same material and having their lengths in the ratio $6 : 1$ are connected in series. The potential difference across the wire are $3 V$ and $2 V$ respectively. If $r_{A}$ and $r_{B}$ are the radii of $A$ and $B$ respectively, then $\frac{r_{B}}{r_{A}}$ is

Discussion

4104.	Velocity of an object can be changed by altering:
Answer» Velocity of an object can be changed by altering:

Discussion

4105.	The gap between the plates of a plane capacitor is filled with an isotropic insulator whose dielectric constant varies in the direction perpendicular to the plates according to the law K=K1[1+sinπdx], where d is the separation between the plates and K1 is a constant. The area of the plates is S. Then the capacitance of the capacitor is
Answer» The gap between the plates of a plane capacitor is filled with an isotropic insulator whose dielectric constant varies in the direction perpendicular to the plates according to the law $K = K_{1} [1 + sin \frac{π}{d} x]$ , where $d$ is the separation between the plates and $K_{1}$ is a constant. The area of the plates is $S$ . Then the capacitance of the capacitor is

Discussion

4106.	As the altitude of a body increases, do the weight and mass both vary ?
Answer» As the altitude of a body increases, do the weight and mass both vary ?

Discussion

4107.	Distance of eye lens from retina is 2 cm for a person. Maximum focal length of the eye lens for the person is 1.96 cm. Find the far point of the person
Answer» Distance of eye lens from retina is $2 cm$ for a person. Maximum focal length of the eye lens for the person is $1.96 cm$ . Find the far point of the person

Discussion

4108.	3.26 light year=how many metres
Answer» 3.26 light year=how many metres

Discussion

4109.	Liquids generally have lower density as compared to solid but you must have observed that ice floats on water by find out
Answer» Liquids generally have lower density as compared to solid but you must have observed that ice floats on water by find out

Discussion

4110.	Difference between fluidity and viscosity
Answer» Difference between fluidity and viscosity

Discussion

4111.	Categorize the following motion as being either an example of positive(+ve) or negative(-ve) acceleration. i. Speeding up the motion = ___ ii. Slowing down the motion = ___
Answer» Categorize the following motion as being either an example of positive(+ve) or negative(-ve) acceleration. i. Speeding up the motion = ___ ii. Slowing down the motion = ___

Discussion

4112.	A body moving with uniform retardation covers 3km before its speed is reduced to half of its initial value. It comes to rest in another distance of
Answer» A body moving with uniform retardation covers 3km before its speed is reduced to half of its initial value. It comes to rest in another distance of

Discussion

4113.	Which of the following is not true regarding energy?
Answer» Which of the following is not true regarding energy?

Discussion

4114.	If p represents radiation pressure, represents speed of light and Q represents radiation energy striking a unit area per second,then non-zero integers X,y and z such that p^x Q^y c^z.
Answer» If p represents radiation pressure, represents speed of light and Q represents radiation energy striking a unit area per second,then non-zero integers X,y and z such that p^x Q^y c^z.

Discussion

4115.	What is the effect of force when a ball is hit with a bat ?
Answer» What is the effect of force when a ball is hit with a bat ?

Discussion

4116.	A ball thrown vertically upwards with a speed of 20 ms−1 from the top of a tower reaches the earth in 8 s. Find the height of the tower. Take g=10 ms−2
Answer» A ball thrown vertically upwards with a speed of $20 m s^{- 1}$ from the top of a tower reaches the earth in $8 s$ . Find the height of the tower. Take $g = 10 m s^{- 2}$

Discussion

4117.	A horse runs along a circle with a speed of 20 km/h. A lantern is at the centre of the circle. A fence is there along the tangent to the circle at the point at which the horse starts. The speed with which the shadow of the horse moves along the fence at the moment when it covers 18 of the circle (in km/h) is
Answer» A horse runs along a circle with a speed of $20 km/h$ . A lantern is at the centre of the circle. A fence is there along the tangent to the circle at the point at which the horse starts. The speed with which the shadow of the horse moves along the fence at the moment when it covers $\frac{1}{8}$ of the circle (in $km/h$ ) is

Discussion

4118.	A U - shaped wire is placed before a concave mirror having radius of curvature 20 cm as shown in the figure. Find the total length of the image.
Answer» A U - shaped wire is placed before a concave mirror having radius of curvature $20 cm$ as shown in the figure. Find the total length of the image.

Discussion

4119.	A car travels first 30km with a uniform speed of 60 km/h and then next 30 km with a uniform speed of 40 km/h. Calculate :(i) the total time of journey, (ii) the average speed of the car.
Answer» A car travels first 30km with a uniform speed of 60 km/h and then next 30 km with a uniform speed of 40 km/h. Calculate :(i) the total time of journey, (ii) the average speed of the car.

Discussion

4120.	20 The vapour density of a volatiles chloride of a metal is 96 and the specific heat of the metal is 0.13cal/g the eq.weight of the metal will be?
Answer» 20 The vapour density of a volatiles chloride of a metal is 96 and the specific heat of the metal is 0.13cal/g the eq.weight of the metal will be?

Discussion

4121.	26.The displacement of a particle moving in a straight line is described by the relation,s=6+12t-2t². Here,s is in metre and t is in second. The distance covered by particle in first 5 seconds is?
Answer» 26.The displacement of a particle moving in a straight line is described by the relation,s=6+12t-2t². Here,s is in metre and t is in second. The distance covered by particle in first 5 seconds is?

Discussion

4122.	For the graph given below choose the correct option : TableATableBa) LineAi) Accelerated Motionb) LineBii) Constant velocity (high magnitude)c) CurveCiii) At restd) LineEiv) Constant Velocity (low magnitude)
Answer» For the graph given below choose the correct option : $\begin{matrix} T a b l e A & T a b l e B a) L i n e A & i) A c c e l e r a t e d M o t i o n b) L i n e B & i i) C o n s t a n t v e l o c i t y (h i g h m a g n i t u d e) c) C u r v e C & i i i) A t r e s t d) L i n e E & i v) C o n s t a n t V e l o c i t y (l o w m a g n i t u d e) \end{matrix}$

4122.

For the graph given below choose the correct option : TableATableBa) LineAi) Accelerated Motionb) LineBii) Constant velocity (high magnitude)c) CurveCiii) At restd) LineEiv) Constant Velocity (low magnitude)

Answer»

For the graph given below choose the correct option :

$\begin{matrix} T a b l e A & T a b l e B a) L i n e A & i) A c c e l e r a t e d M o t i o n b) L i n e B & i i) C o n s t a n t v e l o c i t y (h i g h m a g n i t u d e) c) C u r v e C & i i i) A t r e s t d) L i n e E & i v) C o n s t a n t V e l o c i t y (l o w m a g n i t u d e) \end{matrix}$

Discussion

4123.	The velocity of a particle of mass 1 kg is given by v = (t3 + t) m/s. The average force acting on the particle between t = 0 to t = 2s will be
Answer» The velocity of a particle of mass 1 kg is given by v = (t3 + t) m/s. The average force acting on the particle between t = 0 to t = 2s will be

Discussion

4124.	90.A paper weight is dropped from the roof of a 35 storey building each storey being 3 meter high. It passes the ceiling of the 20th storey at x m/s. Find x.
Answer» 90.A paper weight is dropped from the roof of a 35 storey building each storey being 3 meter high. It passes the ceiling of the 20th storey at x m/s. Find x.

Discussion

4125.	How will the magnitude of magnification change if an object placed at center of curvature is moved towards focus in concave mirror?
Answer» How will the magnitude of magnification change if an object placed at center of curvature is moved towards focus in concave mirror?

Discussion

4126.	Calculate the value of the electric current (i) in the following circuit.
Answer» Calculate the value of the electric current $(i)$ in the following circuit.

Discussion

4127.	When is velocity of sound more;during winters or during summers?
Answer» When is velocity of sound more;during winters or during summers?

Discussion

4128.	The first overtone in a closed pipe has a frequency [JIPMER 1999]
Answer» The first overtone in a closed pipe has a frequency [JIPMER 1999]

4128.

The first overtone in a closed pipe has a frequency [JIPMER 1999]

Answer»

The first overtone in a closed pipe has a frequency

[JIPMER 1999]

Discussion

4129.	A body floats or sinks due to the difference in their:
Answer» A body floats or sinks due to the difference in their:

Discussion

4130.	10. Two bodies of masses mi and m, have samekinetic energy. The ratio of their momentum ism2(1)(2)m2m1m2(4)m2m2(3)m3
Answer» 10. Two bodies of masses mi and m, have samekinetic energy. The ratio of their momentum ism2(1)(2)m2m1m2(4)m2m2(3)m3

Discussion

4131.	When a planet revolve around the sun in an elliptical path then number of points at which velocity equal on magnitude and opposite in direction (HOW)1. 2 2. Infinite 3. 43.3
Answer» When a planet revolve around the sun in an elliptical path then number of points at which velocity equal on magnitude and opposite in direction (HOW) 1. 2 2. Infinite 3. 4 3.3

Discussion

4132.	7. A sold cylindrical wire of radius R carries a current I. The magnetic field 5uT at a point which is '2R' distance away from the axis of were. the magnetic field at a point which is R/3 distance inside from surface of the wire is . 1)10/3uT 2)20/3uT 3)5/3uT 4)40/3uT
Answer» 7. A sold cylindrical wire of radius R carries a current I. The magnetic field 5uT at a point which is '2R' distance away from the axis of were. the magnetic field at a point which is R/3 distance inside from surface of the wire is . 1)10/3uT 2)20/3uT 3)5/3uT 4)40/3uT

Discussion

4133.	Acceleration due to gravity for nearly spherical planet is directly proportional to its radius for a point(1) inside it(2) outside it(3)on its surface(4) none of theseexplain
Answer» Acceleration due to gravity for nearly spherical planet is directly proportional to its radius for a point (1) inside it (2) outside it (3)on its surface (4) none of these explain

Discussion

4134.	Which of the following blocks will move right?
Answer» Which of the following blocks will move right?

Discussion

4135.	Question 25 Two objects of masses m1 and m2 having the same size are dropped simultaneously from heights h1 and h2 respectively. Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if (i) one of the objects is hollow and the other one is solid and (ii) both of them are hollow, size remaining the same in each case. Give reason.
Answer» Question 25 Two objects of masses $m_{1}$ and $m_{2}$ having the same size are dropped simultaneously from heights $h_{1}$ and $h_{2}$ respectively. Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if (i) one of the objects is hollow and the other one is solid and (ii) both of them are hollow, size remaining the same in each case. Give reason.

Discussion

4136.	A concave mirror of radius r is kept on a horizontal table. Water is poured upto a height h .Where should an object be placed ,so that its image is formed on itsel
Answer» A concave mirror of radius r is kept on a horizontal table. Water is poured upto a height h .Where should an object be placed ,so that its image is formed on itsel

Discussion

4137.	How to calculate wave number of second line of banner series in hydrogen spectra?
Answer» How to calculate wave number of second line of banner series in hydrogen spectra?

Discussion

4138.	A helicopter is flying at 72 /root 2 km/h towards north east the wind is blowing at 36 km/h towards south the displacement of the helicopter in 2 hour is
Answer» A helicopter is flying at 72 /root 2 km/h towards north east the wind is blowing at 36 km/h towards south the displacement of the helicopter in 2 hour is

Discussion

4139.	During a track and field meet, the time difference between seeing a smoke from a starter’s gun and hearing the bang would be less ___.
Answer» During a track and field meet, the time difference between seeing a smoke from a starter’s gun and hearing the bang would be less ___.

Discussion

4140.	A rock is sliding down an inclined plane with no friction .If Sn is the distance travelled during time t =n-1 to time t=n then what is the ratio between Sn S(n+1)
Answer» A rock is sliding down an inclined plane with no friction .If Sn is the distance travelled during time t =n-1 to time t=n then what is the ratio between Sn S(n+1)

Discussion

4141.	Two identical spheres are placed in contact with each other. If their radii are varied keeping their mass constant, find the relation between gravitational attraction F and radius of the spheres R. Assume the radii of both the spheres to be identical at all instances.
Answer» Two identical spheres are placed in contact with each other. If their radii are varied keeping their mass constant, find the relation between gravitational attraction $F$ and radius of the spheres $R$ . Assume the radii of both the spheres to be identical at all instances.

Discussion

4142.	A concave mirror forms the real image of a point source, lying on the optical axis at a dis†an ce 60 cm from the mirror. Focal length of mirror is 30 cm. The mirror is cut into two equal parts and its halves are drawn at a dis†an ce 1 cm apart, in a direction perpendicular to the optic axis. The dis†an ce between the images formed by two halves will be?
Answer» A concave mirror forms the real image of a point source, lying on the optical axis at a dis†an ce 60 cm from the mirror. Focal length of mirror is 30 cm. The mirror is cut into two equal parts and its halves are drawn at a dis†an ce 1 cm apart, in a direction perpendicular to the optic axis. The dis†an ce between the images formed by two halves will be?

Discussion

4143.	A force of 20 N acting on a body of mass 10 kg is found to double its velocity in 8 s. Find its initial velocity.
Answer» A force of $20 N$ acting on a body of mass $10 k g$ is found to double its velocity in $8 s$ . Find its initial velocity.

Discussion

4144.	The arrangement of two converging lenses is shown in the figure. The incident rays are parallel to the principle axis. What should be the value of d so that a final real image of object is formed at infinity?
Answer» The arrangement of two converging lenses is shown in the figure. The incident rays are parallel to the principle axis. What should be the value of $d$ so that a final real image of object is formed at infinity?

Discussion

4145.	Question 23 Two quantities are said to vary___with each other, if they increase (decrease) together in such a manner that the ratio of their corresponding values remains constant.
Answer» Question 23 Two quantities are said to vary___with each other, if they increase (decrease) together in such a manner that the ratio of their corresponding values remains constant.

4145.

Question 23 Two quantities are said to vary___with each other, if they increase (decrease) together in such a manner that the ratio of their corresponding values remains constant.

Answer»

Question 23

Two quantities are said to vary___with each other, if they increase (decrease) together in such a manner that the ratio of their corresponding values remains constant.

Discussion

4146.	a particle is moving along a straight line with uniform acceleration has velocites 7m/s at P and 17m/s at Q if R is the midpoint of PQ then average velocity between R and
Answer» a particle is moving along a straight line with uniform acceleration has velocites 7m/s at P and 17m/s at Q if R is the midpoint of PQ then average velocity between R and

Discussion

4147.	3.A balloon is going upwards with velocity 12 m/s. it releases a packet when it is at a height 65 m from the ground .how much time the packet will take to reach the ground ?
Answer» 3.A balloon is going upwards with velocity 12 m/s. it releases a packet when it is at a height 65 m from the ground .how much time the packet will take to reach the ground ?

Discussion

4148.	The given graph shows the variation of velocity with displacement. Which one of the graph given below correctly represents the variation of acceleration with displacement ?
Answer» The given graph shows the variation of velocity with displacement. Which one of the graph given below correctly represents the variation of acceleration with displacement ?

Discussion

4149.	a capacitor of charge 40uc is charged to a potential of 100v find the capacitance
Answer» a capacitor of charge 40uc is charged to a potential of 100v find the capacitance

Discussion

4150.	A satellite orbiting about Earth does not fall down because of ___________.
Answer» A satellite orbiting about Earth does not fall down because of ___________.

Discussion

Explore topic-wise InterviewSolutions in .

45. A light and a heavy object have the same momentum. find the ratio of their kinetic energy. which will have a greater kinetic energy??

Two wires A and B made of same material and having their lengths in the ratio 6:1 are connected in series. The potential difference across the wire are 3 V and 2 V respectively. If rA and rB are the radii of A and B respectively, then rBrA is

Velocity of an object can be changed by altering:

As the altitude of a body increases, do the weight and mass both vary ?

Distance of eye lens from retina is 2 cm for a person. Maximum focal length of the eye lens for the person is 1.96 cm. Find the far point of the person

3.26 light year=how many metres

Liquids generally have lower density as compared to solid but you must have observed that ice floats on water by find out

Difference between fluidity and viscosity

Categorize the following motion as being either an example of positive(+ve) or negative(-ve) acceleration. i. Speeding up the motion = ___ ii. Slowing down the motion = ___

A body moving with uniform retardation covers 3km before its speed is reduced to half of its initial value. It comes to rest in another distance of

Which of the following is not true regarding energy?

If p represents radiation pressure, represents speed of light and Q represents radiation energy striking a unit area per second,then non-zero integers X,y and z such that p^x Q^y c^z.

What is the effect of force when a ball is hit with a bat ?

A ball thrown vertically upwards with a speed of 20 ms−1 from the top of a tower reaches the earth in 8 s. Find the height of the tower. Take g=10 ms−2

A U - shaped wire is placed before a concave mirror having radius of curvature 20 cm as shown in the figure. Find the total length of the image.

A car travels first 30km with a uniform speed of 60 km/h and then next 30 km with a uniform speed of 40 km/h. Calculate :(i) the total time of journey, (ii) the average speed of the car.

20 The vapour density of a volatiles chloride of a metal is 96 and the specific heat of the metal is 0.13cal/g the eq.weight of the metal will be?

26.The displacement of a particle moving in a straight line is described by the relation,s=6+12t-2t². Here,s is in metre and t is in second. The distance covered by particle in first 5 seconds is?

For the graph given below choose the correct option : TableATableBa) LineAi) Accelerated Motionb) LineBii) Constant velocity (high magnitude)c) CurveCiii) At restd) LineEiv) Constant Velocity (low magnitude)

The velocity of a particle of mass 1 kg is given by v = (t3 + t) m/s. The average force acting on the particle between t = 0 to t = 2s will be

90.A paper weight is dropped from the roof of a 35 storey building each storey being 3 meter high. It passes the ceiling of the 20th storey at x m/s. Find x.

How will the magnitude of magnification change if an object placed at center of curvature is moved towards focus in concave mirror?

Calculate the value of the electric current (i) in the following circuit.

When is velocity of sound more;during winters or during summers?

The first overtone in a closed pipe has a frequency [JIPMER 1999]

A body floats or sinks due to the difference in their:

10. Two bodies of masses mi and m, have samekinetic energy. The ratio of their momentum ism2(1)(2)m2m1m2(4)m2m2(3)m3

When a planet revolve around the sun in an elliptical path then number of points at which velocity equal on magnitude and opposite in direction (HOW)1. 2 2. Infinite 3. 43.3

7. A sold cylindrical wire of radius R carries a current I. The magnetic field 5uT at a point which is '2R' distance away from the axis of were. the magnetic field at a point which is R/3 distance inside from surface of the wire is . 1)10/3uT 2)20/3uT 3)5/3uT 4)40/3uT

Acceleration due to gravity for nearly spherical planet is directly proportional to its radius for a point(1) inside it(2) outside it(3)on its surface(4) none of theseexplain

Which of the following blocks will move right?

A concave mirror of radius r is kept on a horizontal table. Water is poured upto a height h .Where should an object be placed ,so that its image is formed on itsel

How to calculate wave number of second line of banner series in hydrogen spectra?

A helicopter is flying at 72 /root 2 km/h towards north east the wind is blowing at 36 km/h towards south the displacement of the helicopter in 2 hour is

During a track and field meet, the time difference between seeing a smoke from a starter’s gun and hearing the bang would be less ___.

A rock is sliding down an inclined plane with no friction .If Sn is the distance travelled during time t =n-1 to time t=n then what is the ratio between Sn S(n+1)

Two identical spheres are placed in contact with each other. If their radii are varied keeping their mass constant, find the relation between gravitational attraction F and radius of the spheres R. Assume the radii of both the spheres to be identical at all instances.

A force of 20 N acting on a body of mass 10 kg is found to double its velocity in 8 s. Find its initial velocity.

The arrangement of two converging lenses is shown in the figure. The incident rays are parallel to the principle axis. What should be the value of d so that a final real image of object is formed at infinity?

Question 23 Two quantities are said to vary___with each other, if they increase (decrease) together in such a manner that the ratio of their corresponding values remains constant.

a particle is moving along a straight line with uniform acceleration has velocites 7m/s at P and 17m/s at Q if R is the midpoint of PQ then average velocity between R and

3.A balloon is going upwards with velocity 12 m/s. it releases a packet when it is at a height 65 m from the ground .how much time the packet will take to reach the ground ?

The given graph shows the variation of velocity with displacement. Which one of the graph given below correctly represents the variation of acceleration with displacement ?

a capacitor of charge 40uc is charged to a potential of 100v find the capacitance

A satellite orbiting about Earth does not fall down because of ___________.

Categorize the following motion as being either an example of positive(+ve) or negative(-ve) acceleration. i. Speeding up the motion = _ ii. Slowing down the motion = _