13232 + Interview Questions in Physics Page 50 InterviewSolution

2451.	What is the weight of the body at the center of the Earth?
Answer» What is the weight of the body at the center of the Earth?

Discussion

2452.	If the mass of 6 identical balls is 570 g, find the mass of one ball.95
Answer» If the mass of 6 identical balls is 570 g, find the mass of one ball. 95

Discussion

2453.	An aluminium rod of length 2m held fixed in horizontal position from its one end has the other end free. when the temperture of the rod increases by 100^° C , the thermal strain produced in rod will be (α =1.6×10^{-6}/^° C
Answer» An aluminium rod of length 2m held fixed in horizontal position from its one end has the other end free. when the temperture of the rod increases by 100^° C , the thermal strain produced in rod will be (α =1.6×10^{-6}/^° C

Discussion

2454.	paramagnetic defination
Answer» paramagnetic defination

Discussion

2455.	With what speed in mileshr must an object be thrown vertically upwards to reach a height of 91.5 m?Take a=9.8ms2
Answer» With what speed in $\frac{m i l e s}{h r}$ must an object be thrown vertically upwards to reach a height of 91.5 m? $T a k e a = 9.8 \frac{m}{s^{2}}$

Discussion

2456.	A train of 150m inlength going towards north at a speed of 10 m/s.A bird flying at 5m/s parallel to the track south. The time taken by the bird to the train.
Answer» A train of 150m inlength going towards north at a speed of 10 m/s.A bird flying at 5m/s parallel to the track south. The time taken by the bird to the train.

Discussion

2457.	A body thrown vertically upward reaches a maximum height H. It then return to ground. Calculate the distance travelled and displacement.
Answer» A body thrown vertically upward reaches a maximum height H. It then return to ground. Calculate the distance travelled and displacement.

Discussion

2458.	a short linear object of length b lies along the axis of a concave mirror of focal length f at a dis†an ce u from the pole of the mirror. the size of the image i
Answer» a short linear object of length b lies along the axis of a concave mirror of focal length f at a dis†an ce u from the pole of the mirror. the size of the image i

Discussion

2459.	A car is moving with a velocity of 40 m/s . The brakes are applied to retard it at restof 2m/s^2 . What will be it's velocity after 5 sec applying the brakes? plz explain
Answer» A car is moving with a velocity of 40 m/s . The brakes are applied to retard it at restof 2m/s^2 . What will be it's velocity after 5 sec applying the brakes? plz explain

Discussion

2460.	If two objects with one having more mass than the other are both dropped from a particular height ,which one will touch the ground first and why?
Answer» If two objects with one having more mass than the other are both dropped from a particular height ,which one will touch the ground first and why?

Discussion

2461.	The given function represents the temperature changes over years in a particular place.Find the range of the function.
Answer» The given function represents the temperature changes over years in a particular place. Find the range of the function.

Discussion

2462.	A rocket is fired‘vertically’ from the surface of mars with a speed of 2km s–1. If 20% of its initial energy is lost due to Martianatmospheric resistance, how far will the rocket go from the surfaceof mars before returning to it? Mass of mars = 6.4× 1023 kg;radius of mars = 3395 km; G = 6.67× 10-11 N m2kg–2.
Answer» A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 km s–1. If 20% of its initial energy is lost due to Martian atmospheric resistance, how far will the rocket go from the surface of mars before returning to it? Mass of mars = 6.4× 1023 kg; radius of mars = 3395 km; G = 6.67× 10^-11 N m² kg^–2.

Discussion

2463.	Three infinitely long current carrying wires are placed at the vertices of an equilateral triangle of side a. Current carrying by each wire is I. They are placed along the line perpendicular to plane of triangle. Find the magnetic field at centroid of triangle ?
Answer» Three infinitely long current carrying wires are placed at the vertices of an equilateral triangle of side a. Current carrying by each wire is I. They are placed along the line perpendicular to plane of triangle. Find the magnetic field at centroid of triangle ?

Discussion

2464.	Express the given formula in term of a. v=(a–b)gd218u
Answer» Express the given formula in term of a. $v = (a - b) \frac{g d^{2}}{18 u}$

2464.

Express the given formula in term of a. v=(a–b)gd218u

Answer»

Express the given formula in term of a.

$v = (a - b) \frac{g d^{2}}{18 u}$

Discussion

2465.	Question 30What do you understand by fuel efficiency?
Answer» Question 30 What do you understand by fuel efficiency?

Discussion

2466.	An isolated village uses wind turbines to get electricity for street lights. What will be the energy changes that take place during the process?
Answer» An isolated village uses wind turbines to get electricity for street lights. What will be the energy changes that take place during the process?

Discussion

2467.	State whether the motion of objects P and Q is uniform or non-uniform motion.
Answer» State whether the motion of objects P and Q is uniform or non-uniform motion.

2467.

State whether the motion of objects P and Q is uniform or non-uniform motion.

Answer»

State whether the motion of objects P and Q is uniform or non-uniform motion.

Discussion

2468.	The formula about acceleration of center of mass
Answer» The formula about acceleration of center of mass

Discussion

2469.	if two identical spheres having charge 16 new column and minus 8 new column are kept at certain distance apart then the force is if they are touched and the aage and kept at the same distance the force
Answer» if two identical spheres having charge 16 new column and minus 8 new column are kept at certain distance apart then the force is if they are touched and the aage and kept at the same distance the force

Discussion

2470.	How was Private Quelch's knowledge exposed even further as the Sergeant's classes went on?
Answer» How was Private Quelch's knowledge exposed even further as the Sergeant's classes went on?

Discussion

2471.	The intensity of the wave is proportional to -f is the frequency of the wave.
Answer» The intensity of the wave is proportional to - $f$ is the frequency of the wave.

Discussion

2472.	Question 8What is a calorific value of a fuel?
Answer» Question 8 What is a calorific value of a fuel?

2472.

Question 8What is a calorific value of a fuel?

Answer»

Question 8

What is a calorific value of a fuel?

Discussion

2473.	Under what circumstances can the terminal potential difference of a battery exceed its emf?
Answer» Under what circumstances can the terminal potential difference of a battery exceed its emf?

Discussion

2474.	A bullet was fired from a gun. Choose the correct option for the situation from the following.
Answer» A bullet was fired from a gun. Choose the correct option for the situation from the following.

Discussion

2475.	A car travels 30km at a uniform speed of 40km/h and next 30 km at a uniform speed of 20km/h. find its average speed.
Answer» A car travels 30km at a uniform speed of 40km/h and next 30 km at a uniform speed of 20km/h. find its average speed.

Discussion

2476.	A car of 1000 kg, is accelerating due to a net force 1200 N. If 4 people of mass 50 Kg board the car, then what is the new acceleration ? (in M/s2)___
Answer» A car of 1000 kg, is accelerating due to a net force 1200 N. If 4 people of mass 50 Kg board the car, then what is the new acceleration ? (in M/s²) ___

Discussion

2477.	a vehicle of mass 10 kg is moving with velcoity 5m/s.to stop it in 1/10th of a sec the required force in opposite direction is
Answer» a vehicle of mass 10 kg is moving with velcoity 5m/s.to stop it in 1/10th of a sec the required force in opposite direction is

Discussion

2478.	In the experiment to find the focal length of a spherical mirror,what will be the radius of curvature of mirror,if the image dis†an ce is x and object dis†an ce is y from the mirror?
Answer» In the experiment to find the focal length of a spherical mirror,what will be the radius of curvature of mirror,if the image dis†an ce is x and object dis†an ce is y from the mirror?

Discussion

2479.	If acceleration a = 3x^2, where x is position then velocity is proportional to
Answer» If acceleration a = 3x^2, where x is position then velocity is proportional to

Discussion

2480.	Determine the speed with which block B rises up (as shown in the figure) if the end of the cord at A is pulled down with a speed of 2 m/s.
Answer» Determine the speed with which block B rises up (as shown in the figure) if the end of the cord at A is pulled down with a speed of $2 m / s$ .

2480.

Determine the speed with which block B rises up (as shown in the figure) if the end of the cord at A is pulled down with a speed of 2 m/s.

Answer»

Determine the speed with which block B rises up (as shown in the figure) if the end of the cord at A is pulled down with a speed of $2 m / s$ .

Discussion

2481.	give reason why temperature on moon ranges from -190 C to110 C
Answer» give reason why temperature on moon ranges from -190 C to110 C

Discussion

2482.	Which of the following is not a valid displacement-time graph of an object in motion?
Answer» Which of the following is not a valid displacement-time graph of an object in motion?

Discussion

2483.	What is the velocity of light in a medium having refractive index 1.5?
Answer» What is the velocity of light in a medium having refractive index $1.5$ ?

Discussion

2484.	The correct figure that shows, schematically, the wave pattern produced by superposition of two waves of frequencies 9 Hz and 11 Hz is:
Answer» The correct figure that shows, schematically, the wave pattern produced by superposition of two waves of frequencies $9 Hz$ and $11 Hz$ is:

Discussion

2485.	Define kilowatt-hour.
Answer» Define kilowatt-hour.

Discussion

2486.	In a hall ,a detector receives sound waves one directly from the source and the other from the reflection from the 25 m high ceiling.The maximum wavelength for which there is minima at position of detector is \lbrack dis†an ce between source and detector is 120 m \rbrack
Answer» In a hall ,a detector receives sound waves one directly from the source and the other from the reflection from the 25 m high ceiling.The maximum wavelength for which there is minima at position of detector is \lbrack dis†an ce between source and detector is 120 m \rbrack

Discussion

2487.	equation of the particle moving along the x axis is x=u(t-2)+a(t-2)^21- the initial velocity of the particle is u2-the acceleration of the particle is a3-the acceleration of the aprticle is 2a4-at t=2 particle is not at origin
Answer» equation of the particle moving along the x axis is x=u(t-2)+a(t-2)^2 1- the initial velocity of the particle is u 2-the acceleration of the particle is a 3-the acceleration of the aprticle is 2a 4-at t=2 particle is not at origin

Discussion

2488.	The weight of a boy on the surface of the moon is 300 N. The weight of this boy on the surface of earth is :
Answer» The weight of a boy on the surface of the moon is $300 N$ . The weight of this boy on the surface of earth is :

Discussion

2489.	what is the magnitude of force in current carrying conductor when the current carrying conductor is placed in a direction parallel to the magnetic field. and when the current carrying conductor is placed normal to the magnetic field.
Answer» what is the magnitude of force in current carrying conductor when the current carrying conductor is placed in a direction parallel to the magnetic field. and when the current carrying conductor is placed normal to the magnetic field.

Discussion

2490.	27. A hypothetical planet has density d, radius R, and surface gravitational acceleration g. If the radius of the planet were doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet's surface would be- 1. 4g 2. 2g 3. g 4. g/2
Answer» 27. A hypothetical planet has density d, radius R, and surface gravitational acceleration g. If the radius of the planet were doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet's surface would be- 1. 4g 2. 2g 3. g 4. g/2

Discussion

2491.	Rutherford's alpha particle scattering experiment established that:
Answer» Rutherford's alpha particle scattering experiment established that:

Discussion

2492.	For the arrangement shown in figure, pulleys andstrings are ideal. Find out the acceleration of 2 kgblock2 kg1 kg45^° 459g 2(1)3(2)32g(4) 22g(3)3
Answer» For the arrangement shown in figure, pulleys andstrings are ideal. Find out the acceleration of 2 kgblock2 kg1 kg45^° 459g 2(1)3(2)32g(4) 22g(3)3

Discussion

2493.	Explain the following : (i) A balloon collapses when air is removed from it. (ii) Water does not run out of a dropper unless its rubber bulb is pressed. (iii) Two holes are made in a completely filled sealed tin can to take out oil from it.
Answer» Explain the following : (i) A balloon collapses when air is removed from it. (ii) Water does not run out of a dropper unless its rubber bulb is pressed. (iii) Two holes are made in a completely filled sealed tin can to take out oil from it.

Discussion

2494.	v=mx-c then comment how acceleration changes with tim
Answer» v=mx-c then comment how acceleration changes with tim

Discussion

2495.	Binding energy of a nucleus is
Answer» Binding energy of a nucleus is

Discussion

2496.	Two wires each of radius of cross-section r but of different materials are connected together end to end (in series). If the densities of charge carriers in the two wires are in the ratio 1:4, the drift velocity of electrons in the two wires will be in the ratio
Answer» Two wires each of radius of cross-section $r$ but of different materials are connected together end to end (in series). If the densities of charge carriers in the two wires are in the ratio $1 : 4$ , the drift velocity of electrons in the two wires will be in the ratio

Discussion

2497.	A body moving along a straight line at 20 metre per second undergoes and acceleration of 4 m/s2after 2 second is its speed will be
Answer» A body moving along a straight line at 20 metre per second undergoes and acceleration of 4 m/s²after 2 second is its speed will be

Discussion

2498.	A 200m long train crosses 400m bridge with a velocity of 36km/h. Find the time taken by the train to cross the bridge
Answer» A 200m long train crosses 400m bridge with a velocity of 36km/h. Find the time taken by the train to cross the bridge

Discussion

2499.	A particle of maas m is thrown horizontally from the top of a tower. An another particle of mass 2m is thrown vertically upward . Find the acceleration of centre of mass of the system. Why the acceleration of both particles is taken to be (-g) ??
Answer» A particle of maas m is thrown horizontally from the top of a tower. An another particle of mass 2m is thrown vertically upward . Find the acceleration of centre of mass of the system. Why the acceleration of both particles is taken to be (-g) ??

Discussion

2500.	What is the weight of a block of mass 5 kg at the centre of the Earth? (g=9.8 m s−2)
Answer» What is the weight of a block of mass $5 k g$ at the centre of the Earth? $(g = 9.8 m s^{- 2}$ )

Discussion

Explore topic-wise InterviewSolutions in .

What is the weight of the body at the center of the Earth?

If the mass of 6 identical balls is 570 g, find the mass of one ball.95

An aluminium rod of length 2m held fixed in horizontal position from its one end has the other end free. when the temperture of the rod increases by 100^° C , the thermal strain produced in rod will be (α =1.6×10^{-6}/^° C

paramagnetic defination

With what speed in mileshr must an object be thrown vertically upwards to reach a height of 91.5 m?Take a=9.8ms2

A train of 150m inlength going towards north at a speed of 10 m/s.A bird flying at 5m/s parallel to the track south. The time taken by the bird to the train.

A body thrown vertically upward reaches a maximum height H. It then return to ground. Calculate the distance travelled and displacement.

a short linear object of length b lies along the axis of a concave mirror of focal length f at a dis†an ce u from the pole of the mirror. the size of the image i

A car is moving with a velocity of 40 m/s . The brakes are applied to retard it at restof 2m/s^2 . What will be it's velocity after 5 sec applying the brakes? plz explain

If two objects with one having more mass than the other are both dropped from a particular height ,which one will touch the ground first and why?

The given function represents the temperature changes over years in a particular place.Find the range of the function.

Three infinitely long current carrying wires are placed at the vertices of an equilateral triangle of side a. Current carrying by each wire is I. They are placed along the line perpendicular to plane of triangle. Find the magnetic field at centroid of triangle ?

Express the given formula in term of a. v=(a–b)gd218u

Question 30What do you understand by fuel efficiency?

An isolated village uses wind turbines to get electricity for street lights. What will be the energy changes that take place during the process?

State whether the motion of objects P and Q is uniform or non-uniform motion.

The formula about acceleration of center of mass

if two identical spheres having charge 16 new column and minus 8 new column are kept at certain distance apart then the force is if they are touched and the aage and kept at the same distance the force

How was Private Quelch's knowledge exposed even further as the Sergeant's classes went on?

The intensity of the wave is proportional to -f is the frequency of the wave.

Question 8What is a calorific value of a fuel?

Under what circumstances can the terminal potential difference of a battery exceed its emf?

A bullet was fired from a gun. Choose the correct option for the situation from the following.

A car travels 30km at a uniform speed of 40km/h and next 30 km at a uniform speed of 20km/h. find its average speed.

A car of 1000 kg, is accelerating due to a net force 1200 N. If 4 people of mass 50 Kg board the car, then what is the new acceleration ? (in M/s2)___

a vehicle of mass 10 kg is moving with velcoity 5m/s.to stop it in 1/10th of a sec the required force in opposite direction is

In the experiment to find the focal length of a spherical mirror,what will be the radius of curvature of mirror,if the image dis†an ce is x and object dis†an ce is y from the mirror?

If acceleration a = 3x^2, where x is position then velocity is proportional to

Determine the speed with which block B rises up (as shown in the figure) if the end of the cord at A is pulled down with a speed of 2 m/s.

give reason why temperature on moon ranges from -190 C to110 C

Which of the following is not a valid displacement-time graph of an object in motion?

What is the velocity of light in a medium having refractive index 1.5?

The correct figure that shows, schematically, the wave pattern produced by superposition of two waves of frequencies 9 Hz and 11 Hz is:

Define kilowatt-hour.

In a hall ,a detector receives sound waves one directly from the source and the other from the reflection from the 25 m high ceiling.The maximum wavelength for which there is minima at position of detector is \lbrack dis†an ce between source and detector is 120 m \rbrack

equation of the particle moving along the x axis is x=u(t-2)+a(t-2)^21- the initial velocity of the particle is u2-the acceleration of the particle is a3-the acceleration of the aprticle is 2a4-at t=2 particle is not at origin

The weight of a boy on the surface of the moon is 300 N. The weight of this boy on the surface of earth is :

what is the magnitude of force in current carrying conductor when the current carrying conductor is placed in a direction parallel to the magnetic field. and when the current carrying conductor is placed normal to the magnetic field.

27. A hypothetical planet has density d, radius R, and surface gravitational acceleration g. If the radius of the planet were doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet's surface would be- 1. 4g 2. 2g 3. g 4. g/2

Rutherford's alpha particle scattering experiment established that:

For the arrangement shown in figure, pulleys andstrings are ideal. Find out the acceleration of 2 kgblock2 kg1 kg45^° 459g 2(1)3(2)32g(4) 22g(3)3

Explain the following : (i) A balloon collapses when air is removed from it. (ii) Water does not run out of a dropper unless its rubber bulb is pressed. (iii) Two holes are made in a completely filled sealed tin can to take out oil from it.

v=mx-c then comment how acceleration changes with tim

Binding energy of a nucleus is

Two wires each of radius of cross-section r but of different materials are connected together end to end (in series). If the densities of charge carriers in the two wires are in the ratio 1:4, the drift velocity of electrons in the two wires will be in the ratio

A body moving along a straight line at 20 metre per second undergoes and acceleration of 4 m/s2after 2 second is its speed will be

A 200m long train crosses 400m bridge with a velocity of 36km/h. Find the time taken by the train to cross the bridge

A particle of maas m is thrown horizontally from the top of a tower. An another particle of mass 2m is thrown vertically upward . Find the acceleration of centre of mass of the system. Why the acceleration of both particles is taken to be (-g) ??

What is the weight of a block of mass 5 kg at the centre of the Earth? (g=9.8 m s−2)