13232 + Interview Questions in Physics Page 41 InterviewSolution

2001.	A body of mass 500 g . Initially at rest , is acted upon by a force which causes it to move a distance of 4m in 2s, calculate the force applied.
Answer» A body of mass 500 g . Initially at rest , is acted upon by a force which causes it to move a distance of 4m in 2s, calculate the force applied.

Discussion

2002.	67.Block ‘B’ moves without rotation vertically downwards with constant velocity of 1m/s then what is the relative velocity of C with respect to A :
Answer» 67.Block ‘B’ moves without rotation vertically downwards with constant velocity of 1m/s then what is the relative velocity of C with respect to A :

Discussion

2003.	Find the length of a seconds' pendulum at a place where g = 10 m s-2 (Take π = 3.14).
Answer» Find the length of a seconds' pendulum at a place where g = 10 m s-2 (Take π = 3.14).

Discussion

2004.	Horse meets continuous of force in order to move a cart with a constant speed.why?
Answer» Horse meets continuous of force in order to move a cart with a constant speed.why?

Discussion

2005.	A body having 10 kg mass is traveling with a certain velocity and has 20 kgms−1 momentum. Calculate its kinetic energy (in Joule)? 20
Answer» A body having $10 k g$ mass is traveling with a certain velocity and has $20 k g m s^{- 1}$ momentum. Calculate its kinetic energy (in Joule)? 20

Discussion

2006.	If the light rays trace their paths back on reflection don't the particles collide?
Answer» If the light rays trace their paths back on reflection don't the particles collide?

Discussion

2007.	The following time-displacement graph (fig.) represents
Answer» The following time-displacement graph (fig.) represents

2007.

The following time-displacement graph (fig.) represents

Answer»

The following time-displacement graph (fig.) represents

Discussion

2008.	A particle with specific charges (s) is fired with a speed v toward a wall at a dis†an ce d perpendicular to the wall what minimum magnetic field exist in this region for the particle does not hit the wall
Answer» A particle with specific charges (s) is fired with a speed v toward a wall at a dis†an ce d perpendicular to the wall what minimum magnetic field exist in this region for the particle does not hit the wall

Discussion

2009.	Define one ohm. A resistance of 6 ohms is connected in series with another resistance of 4 ohms.A potential difference of 20 volts is applied across the combination.Calculate the current through the circuit and potential difference across the 6 ohm resistance.
Answer» Define one ohm. A resistance of 6 ohms is connected in series with another resistance of 4 ohms. A potential difference of 20 volts is applied across the combination. Calculate the current through the circuit and potential difference across the 6 ohm resistance.

Discussion

2010.	7. A ball is thrown vertically upwards. The velocity at one third of the maximum heigh is 8 m/s . The velocity with which of the ball was thrown up
Answer» 7. A ball is thrown vertically upwards. The velocity at one third of the maximum heigh is 8 m/s . The velocity with which of the ball was thrown up

Discussion

2011.	3. Two particle each having charge +q are fixed at the position (-a,0) and (a,0). Find electric field at the position ( 0,y).then find the value y much less than a.
Answer» 3. Two particle each having charge +q are fixed at the position (-a,0) and (a,0). Find electric field at the position ( 0,y).then find the value y much less than a.

Discussion

2012.	An infinite ladder network of resistance is constructed with a 1 Ω and 2 Ω resistance as shown in figure. What is the value of effective resistance between A & B? (Give integer value)
Answer» An infinite ladder network of resistance is constructed with a $1 Ω$ and $2 Ω$ resistance as shown in figure. What is the value of effective resistance between $A$ & $B$ ? (Give integer value)

Discussion

2013.	Two planets of equal masses, orbit a much more massive star. Planet m1 moves in a circular orbit of radius 1×108 km with a period of 2 years and planet m2 moves in an elliptical orbit with closest distance r1=1×108 km and farthest distance r2=1.8×108 km, as shown:What is the mass of the star? (Take G=203×10−11 N m2kg−2 and π2≈10)
Answer» Two planets of equal masses, orbit a much more massive star. Planet $m_{1}$ moves in a circular orbit of radius $1 \times 10^{8} km$ with a period of $2 years$ and planet $m_{2}$ moves in an elliptical orbit with closest distance $r_{1} = 1 \times 10^{8} km$ and farthest distance $r_{2} = 1.8 \times 10^{8} km$ , as shown: What is the mass of the star? (Take $G = \frac{20}{3} \times 10^{- 11} {N m}^{2} {kg}^{- 2} and π^{2} \approx 10$ )

Discussion

2014.	State whether the following quantity is a scalar or vector? (a) pressure (b) force (c) momentum (d) energy (f) weight (f) speed.
Answer» State whether the following quantity is a scalar or vector? (a) pressure (b) force (c) momentum (d) energy (f) weight (f) speed.

2014.

State whether the following quantity is a scalar or vector? (a) pressure (b) force (c) momentum (d) energy (f) weight (f) speed.

Answer»

State whether the following quantity is a scalar or vector?

(a) pressure (b) force

(c) momentum (d) energy

(f) weight (f) speed.

Discussion

2015.	Among the following, the substance expected to have the highest ignition temperature is
Answer» Among the following, the substance expected to have the highest ignition temperature is

Discussion

2016.	the focal length of a lens is f and refractive index =1.5 .its refractive index has increased by 1% due to some changes in material with time .the % decrease in focal length for refractive index =1.5 i
Answer» the focal length of a lens is f and refractive index =1.5 .its refractive index has increased by 1% due to some changes in material with time .the % decrease in focal length for refractive index =1.5 i

Discussion

2017.	a body of mass m is allowed to fall with the help of string with downward acceleration g/6 to a distance x the work done by the string is
Answer» a body of mass m is allowed to fall with the help of string with downward acceleration g/6 to a distance x the work done by the string is

Discussion

2018.	Which of the following is an example of uniform circular motion ?
Answer» Which of the following is an example of uniform circular motion ?

Discussion

2019.	29.a stone is thrown horizontally with speed 30 m/s from a tower of height 50 m.the height of stone from ground at which it MAKES 45 DEGREE with horizontal
Answer» 29.a stone is thrown horizontally with speed 30 m/s from a tower of height 50 m.the height of stone from ground at which it MAKES 45 DEGREE with horizontal

Discussion

2020.	A particle moves in x- yplane according to rule x=asin wt and y= acos wt .the particle follows A .an elliptical path B. A circular path C.A parabolic path D.a straight line path inclined equally to x and y axis
Answer» A particle moves in x- yplane according to rule x=asin wt and y= acos wt .the particle follows A .an elliptical path B. A circular path C.A parabolic path D.a straight line path inclined equally to x and y axis

Discussion

2021.	What is centripetal force
Answer» What is centripetal force

Discussion

2022.	Statement: If parking space is not available in office, park your vehicles in the mall and walk to the office. Assumptions: I. The mall is at a walk able distance from the office. II. The office does not allow visitors vehicles in its premises.
Answer» Statement: If parking space is not available in office, park your vehicles in the mall and walk to the office. Assumptions: I. The mall is at a walk able distance from the office. II. The office does not allow visitors vehicles in its premises.

2022.

Statement: If parking space is not available in office, park your vehicles in the mall and walk to the office. Assumptions: I. The mall is at a walk able distance from the office. II. The office does not allow visitors vehicles in its premises.

Answer»

Statement: If parking space is not available in office, park your vehicles in the mall and walk to the office.

Assumptions:

I. The mall is at a walk able distance from the office.

II. The office does not allow visitors vehicles in its premises.

Discussion

2023.	Define force. In which units is it measured ?
Answer» Define force. In which units is it measured ?

Discussion

2024.	Relative density of a substance is expressed by comparing the density of that substance with density of:
Answer» Relative density of a substance is expressed by comparing the density of that substance with density of:

Discussion

2025.	Jdr Couple on loop &willA current of 1 A is flowing along positive x-axis throughstraight wire of length 0.5 m placed in a region ofbmagnetic field given by B = (2i + 4j)T. The magnitude andthe direction of the force experienced by the wirerespectively areTWB-JEE 2013(a) 18N, along positive z-axis(b) 20N, along positive x-axis2N, along positivea
Answer» Jdr Couple on loop &willA current of 1 A is flowing along positive x-axis throughstraight wire of length 0.5 m placed in a region ofbmagnetic field given by B = (2i + 4j)T. The magnitude andthe direction of the force experienced by the wirerespectively areTWB-JEE 2013(a) 18N, along positive z-axis(b) 20N, along positive x-axis2N, along positivea

Discussion

2026.	Examples of Newton's 1st law of motion
Answer» Examples of Newton's 1st law of motion

Discussion

2027.	15. A solid sphere rolls down a rough inclined planewithout slipping. Select the correct statement.(1) If θ is increased, frictional force will remainconstant(2) Some energy is lost in form of heat due tofriction between sphere and plane(3) Friction will support the rotational motion of4) Both (2) and (3)sphere
Answer» 15. A solid sphere rolls down a rough inclined planewithout slipping. Select the correct statement.(1) If θ is increased, frictional force will remainconstant(2) Some energy is lost in form of heat due tofriction between sphere and plane(3) Friction will support the rotational motion of4) Both (2) and (3)sphere

Discussion

2028.	The distance covered by ultrasound is 6 km. If the ultrasound is detected after 5sec after sending, What is the speed of ultrasound?
Answer» The distance covered by ultrasound is 6 km. If the ultrasound is detected after 5sec after sending, What is the speed of ultrasound?

Discussion

2029.	two bodies falling freely under gravity from heights 'h' and 'H' cover displacements of 5h/9 and 11h/9 respectively during last second of their motion. if acceleration due to gravity is 10m/s then H is?a)45 mb)90 mc)180 md)360 m
Answer» two bodies falling freely under gravity from heights 'h' and 'H' cover displacements of 5h/9 and 11h/9 respectively during last second of their motion. if acceleration due to gravity is 10m/s then H is? a)45 m b)90 m c)180 m d)360 m

Discussion

2030.	An electron is moving in the north direction. It experiences a force the vertically downward direction. The magnetic field at that region is towards____
Answer» An electron is moving in the north direction. It experiences a force the vertically downward direction. The magnetic field at that region is towards____

Discussion

2031.	Prove 1\r2 by using Kepler's law of planetary motion
Answer» Prove 1\r²by using Kepler's law of planetary motion

Discussion

2032.	8. The weight of a body would not be zero(a) at the centre of the earth(b) during a free fall(c) in interplanetary space (d) on a frictionless surface
Answer» 8. The weight of a body would not be zero(a) at the centre of the earth(b) during a free fall(c) in interplanetary space (d) on a frictionless surface

Discussion

2033.	6. A particle is projected from ground at angle 45^° with initial veloci20\sqrt{} m/s. Find (a) change in velocity (b) magnitude of average velocity in a time interval from t=0 to t=3s.
Answer» 6. A particle is projected from ground at angle 45^° with initial veloci20\sqrt{} m/s. Find (a) change in velocity (b) magnitude of average velocity in a time interval from t=0 to t=3s.

Discussion

2034.	76. Mark the correct statement 1. If velocity and acceleration have opposite sign, then speed of particle will increase 2. If velocity is zero at an instant then acceleration of particle will be zero at that instant 3. If the velocity is zero in a time interval then acceleration is not equal to zero at any instant within the time interval 4. A particle can move along X axis only. If it's X coordinate and velocity has opposite sign then particle will move towards origin
Answer» 76. Mark the correct statement 1. If velocity and acceleration have opposite sign, then speed of particle will increase 2. If velocity is zero at an instant then acceleration of particle will be zero at that instant 3. If the velocity is zero in a time interval then acceleration is not equal to zero at any instant within the time interval 4. A particle can move along X axis only. If it's X coordinate and velocity has opposite sign then particle will move towards origin

Discussion

2035.	Two mutually perpendicular forces of 8N and 6N acts on the same body of mass 10kg. Calculate (i) net force acting on the body, (ii) magnitude of acceleration of the body and (iii) direction of acceleration of the body.
Answer» Two mutually perpendicular forces of 8N and 6N acts on the same body of mass 10kg. Calculate (i) net force acting on the body, (ii) magnitude of acceleration of the body and (iii) direction of acceleration of the body.

Discussion

2036.	The height which the acceleration due to gravity is reduced to one fourth of the gravity on the surface of the Earth is
Answer» The height which the acceleration due to gravity is reduced to one fourth of the gravity on the surface of the Earth is

Discussion

2037.	Show that Newton's second law is the real law of Motion.
Answer» Show that Newton's second law is the real law of Motion.

Discussion

2038.	The brakes applied by a car produces an acceleration of 6 m/s2 in opposite direction of motion. If the car takes 2 sec to stop after the application of brakes. Calculate distance during this time.
Answer» The brakes applied by a car produces an acceleration of $6 m / s^{2}$ in opposite direction of motion. If the car takes 2 sec to stop after the application of brakes. Calculate distance during this time.

Discussion

2039.	Sunspots on the surface of the sun are caused due to _______
Answer» Sunspots on the surface of the sun are caused due to _______

Discussion

2040.	What does mechanical advantage(MA) and virtual reality(VR) mean?
Answer» What does mechanical advantage(MA) and virtual reality(VR) mean?

Discussion

2041.	A boat goes 6 km downstream in 20 min and 6 km upstream in 30 min. What is the speed of the boat in still water?
Answer» A boat goes 6 km downstream in 20 min and 6 km upstream in 30 min. What is the speed of the boat in still water?

Discussion

2042.	ntfind centre of massof uniform discof radiusa from which a circular section of radius bhas been removed .the centre of hole is at dist c from centre of disc.n
Answer» ntfind centre of massof uniform discof radiusa from which a circular section of radius bhas been removed .the centre of hole is at dist c from centre of disc.n

Discussion

2043.	Why the wall of a dam is broad at its base?
Answer» Why the wall of a dam is broad at its base?

Discussion

2044.	A particle moves with constant speed in a circle ofradius r and time period T. The centripetalacceleration of the particle is(1) PT(2) T2r(2t T)22TTrT(3)(4)
Answer» A particle moves with constant speed in a circle ofradius r and time period T. The centripetalacceleration of the particle is(1) PT(2) T2r(2t T)22TTrT(3)(4)

Discussion

2045.	The ratio of density of a substance to density of water at 4°C is usually referred as ___.
Answer» The ratio of density of a substance to density of water at 4°C is usually referred as ___.

Discussion

2046.	A force of 10 N acts on a body of mass 5 kg. Find the acceleration produced.
Answer» A force of 10 N acts on a body of mass 5 kg. Find the acceleration produced.

Discussion

2047.	While checking crack in metal using ultrasoind, , why does ultrasound gets deflected from hole or crack and not from solid metal. Define reason behind this
Answer» While checking crack in metal using ultrasoind, , why does ultrasound gets deflected from hole or crack and not from solid metal. Define reason behind this

Discussion

2048.	Which of the following correctly represents the increasing order of frequency?
Answer» Which of the following correctly represents the increasing order of frequency?

Discussion

2049.	A mass m is released from a distance 2R fromcentre on the axis of a fixed ring of mass M andradius R. Speed of mass m at distance R fromcentre of ring is
Answer» A mass m is released from a distance 2R fromcentre on the axis of a fixed ring of mass M andradius R. Speed of mass m at distance R fromcentre of ring is

Discussion

2050.	What is the definition of first law of motion ?
Answer» What is the definition of first law of motion ?

Discussion

Explore topic-wise InterviewSolutions in .

A body of mass 500 g . Initially at rest , is acted upon by a force which causes it to move a distance of 4m in 2s, calculate the force applied.

67.Block ‘B’ moves without rotation vertically downwards with constant velocity of 1m/s then what is the relative velocity of C with respect to A :

Find the length of a seconds' pendulum at a place where g = 10 m s-2 (Take π = 3.14).

Horse meets continuous of force in order to move a cart with a constant speed.why?

A body having 10 kg mass is traveling with a certain velocity and has 20 kgms−1 momentum. Calculate its kinetic energy (in Joule)? 20

If the light rays trace their paths back on reflection don't the particles collide?

The following time-displacement graph (fig.) represents​

A particle with specific charges (s) is fired with a speed v toward a wall at a dis†an ce d perpendicular to the wall what minimum magnetic field exist in this region for the particle does not hit the wall

Define one ohm. A resistance of 6 ohms is connected in series with another resistance of 4 ohms.A potential difference of 20 volts is applied across the combination.Calculate the current through the circuit and potential difference across the 6 ohm resistance.

7. A ball is thrown vertically upwards. The velocity at one third of the maximum heigh is 8 m/s . The velocity with which of the ball was thrown up

3. Two particle each having charge +q are fixed at the position (-a,0) and (a,0). Find electric field at the position ( 0,y).then find the value y much less than a.

An infinite ladder network of resistance is constructed with a 1 Ω and 2 Ω resistance as shown in figure. What is the value of effective resistance between A & B? (Give integer value)

State whether the following quantity is a scalar or vector? (a) pressure (b) force (c) momentum (d) energy (f) weight (f) speed.

Among the following, the substance expected to have the highest ignition temperature is

the focal length of a lens is f and refractive index =1.5 .its refractive index has increased by 1% due to some changes in material with time .the % decrease in focal length for refractive index =1.5 i

a body of mass m is allowed to fall with the help of string with downward acceleration g/6 to a distance x the work done by the string is

Which of the following is an example of uniform circular motion ?

29.a stone is thrown horizontally with speed 30 m/s from a tower of height 50 m.the height of stone from ground at which it MAKES 45 DEGREE with horizontal

A particle moves in x- yplane according to rule x=asin wt and y= acos wt .the particle follows A .an elliptical path B. A circular path C.A parabolic path D.a straight line path inclined equally to x and y axis

What is centripetal force

Statement: If parking space is not available in office, park your vehicles in the mall and walk to the office. Assumptions: I. The mall is at a walk able distance from the office. II. The office does not allow visitors vehicles in its premises.

Define force. In which units is it measured ?

Relative density of a substance is expressed by comparing the density of that substance with density of:

Examples of Newton's 1st law of motion

The distance covered by ultrasound is 6 km. If the ultrasound is detected after 5sec after sending, What is the speed of ultrasound?

two bodies falling freely under gravity from heights 'h' and 'H' cover displacements of 5h/9 and 11h/9 respectively during last second of their motion. if acceleration due to gravity is 10m/s then H is?a)45 mb)90 mc)180 md)360 m

An electron is moving in the north direction. It experiences a force the vertically downward direction. The magnetic field at that region is towards____

Prove 1\r2 by using Kepler's law of planetary motion

8. The weight of a body would not be zero(a) at the centre of the earth(b) during a free fall(c) in interplanetary space (d) on a frictionless surface

6. A particle is projected from ground at angle 45^° with initial veloci20\sqrt{} m/s. Find (a) change in velocity (b) magnitude of average velocity in a time interval from t=0 to t=3s.

Two mutually perpendicular forces of 8N and 6N acts on the same body of mass 10kg. Calculate (i) net force acting on the body, (ii) magnitude of acceleration of the body and (iii) direction of acceleration of the body.

The height which the acceleration due to gravity is reduced to one fourth of the gravity on the surface of the Earth is

Show that Newton's second law is the real law of Motion.

The brakes applied by a car produces an acceleration of 6 m/s2 in opposite direction of motion. If the car takes 2 sec to stop after the application of brakes. Calculate distance during this time.

Sunspots on the surface of the sun are caused due to _______

What does mechanical advantage(MA) and virtual reality(VR) mean?

A boat goes 6 km downstream in 20 min and 6 km upstream in 30 min. What is the speed of the boat in still water?

ntfind centre of massof uniform discof radiusa from which a circular section of radius bhas been removed .the centre of hole is at dist c from centre of disc.n

Why the wall of a dam is broad at its base?

A particle moves with constant speed in a circle ofradius r and time period T. The centripetalacceleration of the particle is(1) PT(2) T2r(2t T)22TTrT(3)(4)

The ratio of density of a substance to density of water at 4°C is usually referred as ___.

A force of 10 N acts on a body of mass 5 kg. Find the acceleration produced.

While checking crack in metal using ultrasoind, , why does ultrasound gets deflected from hole or crack and not from solid metal. Define reason behind this

Which of the following correctly represents the increasing order of frequency?

A mass m is released from a distance 2R fromcentre on the axis of a fixed ring of mass M andradius R. Speed of mass m at distance R fromcentre of ring is

What is the definition of first law of motion ?

The following time-displacement graph (fig.) represents