13232 + Interview Questions in Physics Page 9 InterviewSolution

401.	In a plane mirror, which is the measure of the angle of incidence—the angle between the mirror and the incident ray, or 90° minus the angle between the mirror and the incident ray?
Answer» In a plane mirror, which is the measure of the angle of incidence—the angle between the mirror and the incident ray, or 90° minus the angle between the mirror and the incident ray?

Discussion

402.	Why does a balloon fully inflated with air Rises up vertically for some distance when punctured from below?
Answer» Why does a balloon fully inflated with air Rises up vertically for some distance when punctured from below?

Discussion

403.	The radius of the earth is 6370 km and of mars is 3400 km. If an object of 200 N weighs on earth what will be the weight on mars? The mass of mars is 0.11 that of earth.
Answer» The radius of the earth is 6370 km and of mars is 3400 km. If an object of 200 N weighs on earth what will be the weight on mars? The mass of mars is 0.11 that of earth.

Discussion

404.	The S.I. unit of momentum is:
Answer» The S.I. unit of momentum is:

Discussion

405.	What is kinetic energy difine it ?
Answer» What is kinetic energy difine it ?

Discussion

406.	In a region, potential energy of a particle of charge 2C (U in joules) varies with coordinates x, y and z (in m) as U = 2xyz2 + x. The force acting on the charged particle, when it is placed at origin, will be
Answer» In a region, potential energy of a particle of charge 2C (U in joules) varies with coordinates x, y and z (in m) as U = 2xyz2 + x. The force acting on the charged particle, when it is placed at origin, will be

Discussion

407.	The height of Mercury column in a barometer in a Calcutta laboratory was recordedto be 75cm.Calculate this pressure in SI and cgs units using the following data Specific gravity of Mercury=13.6 Density of water =1000kg/m3 and g is 9.8 m/s at Calcutta
Answer» The height of Mercury column in a barometer in a Calcutta laboratory was recordedto be 75cm.Calculate this pressure in SI and cgs units using the following data Specific gravity of Mercury=13.6 Density of water =1000kg/m3 and g is 9.8 m/s at Calcutta

Discussion

408.	from a tower of height 40 m , two bodies are simultaneously projected horizontally in opposite direction with velocities 2 m/s and 8 m/s respectively . the horizontal distance between two bodies when their velocities are perpendicular to each other is1] 4 m 2] 8 m 3] 1 m 4] 2 m
Answer» from a tower of height 40 m , two bodies are simultaneously projected horizontally in opposite direction with velocities 2 m/s and 8 m/s respectively . the horizontal distance between two bodies when their velocities are perpendicular to each other is 1] 4 m 2] 8 m 3] 1 m 4] 2 m

Discussion

409.	Calculate the force between two point masses of 50 kg and 100 kg separated by a distance of 10 m.
Answer» Calculate the force between two point masses of $50 k g$ and $100 k g$ separated by a distance of $10 m$ .

Discussion

410.	Jupiter ranks ______, among the brightest objects in the night sky.
Answer» Jupiter ranks ______, among the brightest objects in the night sky.

Discussion

411.	According to Newton's third law action is equal to reaction so, why horse is able to pull a cart?
Answer» According to Newton's third law action is equal to reaction so, why horse is able to pull a cart?

Discussion

412.	A child pulls a suitcase through a distance 10 m on a smooth horizontal floor. The handle held in child's hand makes an angle θ with horizontal surface. If a 5 N force is applied and the horizontal component is half of the applied force.Work done by child in pulling suitcase is
Answer» A child pulls a suitcase through a distance 10 m on a smooth horizontal floor. The handle held in child's hand makes an angle $θ$ with horizontal surface. If a 5 N force is applied and the horizontal component is half of the applied force. Work done by child in pulling suitcase is

Discussion

413.	when a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:
Answer» when a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:

Discussion

414.	The V-I graph for four different wires of different materials having the same length and diameter are shown in the figure. Which one of the following wire has the highest resistivity?
Answer» The V-I graph for four different wires of different materials having the same length and diameter are shown in the figure. Which one of the following wire has the highest resistivity?

Discussion

415.	If m is the mass of rod, length l and three similar rods are arranged like 'H', find moment of inertia about the axis passing perpendicularly in one of end of letter 'H'?
Answer» If m is the mass of rod, length l and three similar rods are arranged like 'H', find moment of inertia about the axis passing perpendicularly in one of end of letter 'H'?

Discussion

416.	The heat of combustion of napthalene, C1oH,(s), at constant volume at 25 C was found to be-5133 kJ mol-. Calculate the value of enthalpy change at constant pressure at the sa me temperature
Answer» The heat of combustion of napthalene, C1oH,(s), at constant volume at 25 C was found to be-5133 kJ mol-. Calculate the value of enthalpy change at constant pressure at the sa me temperature

Discussion

417.	The initial velocity of an object is 40 m/s. The acceleration a of the object is given by the following expression. a=-0.1 v, where v is the instantaneous velocity of the object. The velocity of the object after 3 seconds will be
Answer» The initial velocity of an object is 40 m/s. The acceleration a of the object is given by the following expression. a=-0.1 v, where v is the instantaneous velocity of the object. The velocity of the object after 3 seconds will be

Discussion

418.	115.Sun radiates thermal radiation with maximum intensity at the wavelength lambda is equal to 0.5 meu m while its surface temperature is 6000 kelvin. if the sun cools down to a temperature where it emits only 81% of its present power, the maximum intensity will then emitted at wavelength Lambda 1)'=1.5. 2)'=0.5. 3)'=0.53. 4)'=0.17. (where ' is wavelength &all are in meu c)
Answer» 115.Sun radiates thermal radiation with maximum intensity at the wavelength lambda is equal to 0.5 meu m while its surface temperature is 6000 kelvin. if the sun cools down to a temperature where it emits only 81% of its present power, the maximum intensity will then emitted at wavelength Lambda 1)'=1.5. 2)'=0.5. 3)'=0.53. 4)'=0.17. (where ' is wavelength &all are in meu c)

Discussion

419.	Choose the correct pairs from the following:
Answer» Choose the correct pairs from the following:

Discussion

420.	When a current carrying conductor is clasped in such a way that the thumb faces the direction of current, the direction of the curl of fingers corresponds ___.
Answer» When a current carrying conductor is clasped in such a way that the thumb faces the direction of current, the direction of the curl of fingers corresponds ___.

Discussion

421.	A rectangular coil ABCD having a battery connected between its ends A and D is placed in between the pole pieces of a horseshoe magnet as shown. What is the direction of forces on the coil?
Answer» A rectangular coil ABCD having a battery connected between its ends A and D is placed in between the pole pieces of a horseshoe magnet as shown. What is the direction of forces on the coil?

421.

A rectangular coil ABCD having a battery connected between its ends A and D is placed in between the pole pieces of a horseshoe magnet as shown. What is the direction of forces on the coil?

Answer»

A rectangular coil ABCD having a battery connected between its ends A and D is placed in between the pole pieces of a horseshoe magnet as shown. What is the direction of forces on the coil?

Discussion

422.	An arrow fired from a bow attains a maximum height of 5m from the level it is released. If the mass of the arrow is 500grams, work done by the bow on arrow is greater than which of the following? (Assume, g=10ms−2)
Answer» An arrow fired from a bow attains a maximum height of $5 m$ from the level it is released. If the mass of the arrow is $500 g r a m s$ , work done by the bow on arrow is greater than which of the following? (Assume, $g = 10 m s^{- 2}$ )

Discussion

423.	Question 71(i)The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A.At what time did cyclist II rest? How long did the cyclist rest?
Answer» Question 71(i) The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A. At what time did cyclist II rest? How long did the cyclist rest?

Discussion

424.	Potential energy of a particle at position x is given by U=x^2-2x, then position of particle is at 1] x=02]x=23]x=14]x=0.5
Answer» Potential energy of a particle at position x is given by U=x^2-2x, then position of particle is at 1] x=0 2]x=2 3]x=1 4]x=0.5

Discussion

425.	A ball is thrown vertically upward. It has a speed of 10 m/s when it has reached one half of its maximum height. How high does the ball rise?(taking g=10 m/s) 1. 15m 2. 10m 3. 20m 4. 5m
Answer» A ball is thrown vertically upward. It has a speed of 10 m/s when it has reached one half of its maximum height. How high does the ball rise?(taking g=10 m/s) 1. 15m 2. 10m 3. 20m 4. 5m

Discussion

426.	Which of the following is the second nearest star system from Earth? (Considering the Sun to be the closest star to the Earth)
Answer» Which of the following is the second nearest star system from Earth? (Considering the Sun to be the closest star to the Earth)

Discussion

427.	A tennis ball is dropped onto the floor from height 4 m it rebounds to a height of 3m if the ball was in contact with the floor for 0.010 seconds what was its average acceleration during contact
Answer» A tennis ball is dropped onto the floor from height 4 m it rebounds to a height of 3m if the ball was in contact with the floor for 0.010 seconds what was its average acceleration during contact

Discussion

428.	89.What is the power of a plane glass slab?
Answer» 89.What is the power of a plane glass slab?

Discussion

429.	If the object is moving with uniform velocity in a given interval of time, then the average speed and instantaneous velocity are equal, why?
Answer» If the object is moving with uniform velocity in a given interval of time, then the average speed and instantaneous velocity are equal, why?

Discussion

430.	A boy carries 20kg load from ground level to a height of 10m. He does it in 40 seconds. Calculate the power.
Answer» A boy carries 20kg load from ground level to a height of 10m. He does it in 40 seconds. Calculate the power.

Discussion

431.	What is the SI unit of mass, weight and force?
Answer» What is the SI unit of mass, weight and force?

Discussion

432.	An electrical appliance of 500 W is used for 5 hours per day. What will be the energy consumed by the appliance in 30 days?
Answer» An electrical appliance of 500 W is used for 5 hours per day. What will be the energy consumed by the appliance in 30 days?

Discussion

433.	Name these forces:(a) the upward push of water on a submerged object(b) the force which wears away two surfaces as they move over one another(c) the force which pulled the apple off Isaac Newton's tree.
Answer» Name these forces: (a) the upward push of water on a submerged object (b) the force which wears away two surfaces as they move over one another (c) the force which pulled the apple off Isaac Newton's tree.

Discussion

434.	(i) Write the three equations of uniformly accelerated motion. Give the meaning of each symbol which occurs in them.(ii) A car acquires a velocity of 72 km per hour in 10 seconds starting from rest. Find (a) the acceleration, (b) the average velocity, and (c) the distance travelled in this time.
Answer» (i) Write the three equations of uniformly accelerated motion. Give the meaning of each symbol which occurs in them. (ii) A car acquires a velocity of 72 km per hour in 10 seconds starting from rest. Find (a) the acceleration, (b) the average velocity, and (c) the distance travelled in this time.

Discussion

435.	A block of wood floats on the water with 2/3 of its volume submerged . Find its relative density
Answer» A block of wood floats on the water with 2/3 of its volume submerged . Find its relative density

Discussion

436.	11.The diagram shows a bar magnet placed in a uniform magnetic field. When the magnet is allowed to move freely, it will (1) remain stationary (2) turn 90^° clockwise (3) turn 90^° anti - clockwise (4) turn 180^° clockwise
Answer» 11.The diagram shows a bar magnet placed in a uniform magnetic field. When the magnet is allowed to move freely, it will (1) remain stationary (2) turn 90^° clockwise (3) turn 90^° anti - clockwise (4) turn 180^° clockwise

Discussion

437.	A man weighing 60 kg climbs up 45 steps stair case of a building in 9 seconds. If height of each step is 10 cm, then how much power the man has employed?Take g=10 m/s2
Answer» A man weighing 60 kg climbs up 45 steps stair case of a building in 9 seconds. If height of each step is 10 cm, then how much power the man has employed? $T a k e g = 10 m / s^{2}$

Discussion

438.	when terminals of cells are connected by a wire of resis†an ce 4 ohm,the p.d of the cell is 1.6V .If a second wire of same resis†an ce is connected in parallel with the first, the p.dbecomes 1.33V What will be the p.d when a third wire of same resis†an ce is connected in parallel with theother two.?Also find the emf and internal resis†an ce of
Answer» when terminals of cells are connected by a wire of resis†an ce 4 ohm,the p.d of the cell is 1.6V .If a second wire of same resis†an ce is connected in parallel with the first, the p.dbecomes 1.33V What will be the p.d when a third wire of same resis†an ce is connected in parallel with theother two.?Also find the emf and internal resis†an ce of

Discussion

439.	Dimension of power?
Answer» Dimension of power?

Discussion

440.	ntA 200 metre long train moving with velocity 20 metre per second overtakes a man running in the same direction in 20 seconds. how long it will take to overtake the man if is he was running in the opposite direction?n
Answer» ntA 200 metre long train moving with velocity 20 metre per second overtakes a man running in the same direction in 20 seconds. how long it will take to overtake the man if is he was running in the opposite direction?n

Discussion

441.	A stone and the earth attract each other with an equal and opposite force. Why then we see only the stone falling towards the earth but not the earth rising towards the stone?
Answer» A stone and the earth attract each other with an equal and opposite force. Why then we see only the stone falling towards the earth but not the earth rising towards the stone?

Discussion

442.	A boat is rowed across the river at the rate of 4.5km/hr. The river flows at the rate of 6km/hr. The velocity of boat in m/s is 1)2.9 2)3.1 3)2.1 4)5
Answer» A boat is rowed across the river at the rate of 4.5km/hr. The river flows at the rate of 6km/hr. The velocity of boat in m/s is 1)2.9 2)3.1 3)2.1 4)5

442.

A boat is rowed across the river at the rate of 4.5km/hr. The river flows at the rate of 6km/hr. The velocity of boat in m/s is 1)2.9 2)3.1 3)2.1 4)5

Answer»

A boat is rowed across the river at the rate of 4.5km/hr. The river flows at the rate of 6km/hr. The velocity of boat in m/s is

1)2.9

2)3.1

3)2.1

4)5

Discussion

443.	If the direction of electric current in a solenoid, when viewed from one of its ends, is anticlockwise. The pole of this end of the solenoid is ___ .
Answer» If the direction of electric current in a solenoid, when viewed from one of its ends, is anticlockwise. The pole of this end of the solenoid is ___ .

Discussion

444.	Why free electrons move from negative terminal to positive terminal?
Answer» Why free electrons move from negative terminal to positive terminal?

Discussion

445.	An object is subjected to retardation,dv/dt= -5v which has initial velocity of 4 m/s.The time taken by the object to come to rest would be?
Answer» An object is subjected to retardation,dv/dt= -5v which has initial velocity of 4 m/s.The time taken by the object to come to rest would be?

Discussion

446.	Wavelength (λ), frequency (f) and velocity (v) of a sound wave are related as:
Answer» Wavelength ( $λ$ ), frequency $(f)$ and velocity $(v)$ of a sound wave are related as:

Discussion

447.	A luminous object is placed at a dis†an ce of 30cmfrom the convex lens of focal length 20cm.On the other side of the lens at what dis†an ce from the convex lens a convex mirror of radius of curvature 10cm be placed in order to have an upright image of the object to coincide with it?
Answer» A luminous object is placed at a dis†an ce of 30cmfrom the convex lens of focal length 20cm.On the other side of the lens at what dis†an ce from the convex lens a convex mirror of radius of curvature 10cm be placed in order to have an upright image of the object to coincide with it?

Discussion

448.	A partical at rest falling under gravity such that it travels 53.9m in last second of its journey. total time of fall is
Answer» A partical at rest falling under gravity such that it travels 53.9m in last second of its journey. total time of fall is

Discussion

449.	`A uniformly charged hemisphere of radius b and charge density rho has a hemispherical caviety of radius a=b/2 cut from its center . find the potential at the center of the caviety
Answer» `A uniformly charged hemisphere of radius b and charge density rho has a hemispherical caviety of radius a=b/2 cut from its center . find the potential at the center of the caviety

Discussion

450.	Howto know which ray will reach the equator?Like cosmic rays cannot reach, what about the other rays?
Answer» Howto know which ray will reach the equator? Like cosmic rays cannot reach, what about the other rays?

Discussion

Explore topic-wise InterviewSolutions in .

In a plane mirror, which is the measure of the angle of incidence—the angle between the mirror and the incident ray, or 90° minus the angle between the mirror and the incident ray?

Why does a balloon fully inflated with air Rises up vertically for some distance when punctured from below?

The radius of the earth is 6370 km and of mars is 3400 km. If an object of 200 N weighs on earth what will be the weight on mars? The mass of mars is 0.11 that of earth.

The S.I. unit of momentum is:

What is kinetic energy difine it ?

In a region, potential energy of a particle of charge 2C (U in joules) varies with coordinates x, y and z (in m) as U = 2xyz2 + x. The force acting on the charged particle, when it is placed at origin, will be

The height of Mercury column in a barometer in a Calcutta laboratory was recordedto be 75cm.Calculate this pressure in SI and cgs units using the following data Specific gravity of Mercury=13.6 Density of water =1000kg/m3 and g is 9.8 m/s at Calcutta

from a tower of height 40 m , two bodies are simultaneously projected horizontally in opposite direction with velocities 2 m/s and 8 m/s respectively . the horizontal distance between two bodies when their velocities are perpendicular to each other is1] 4 m 2] 8 m 3] 1 m 4] 2 m

Calculate the force between two point masses of 50 kg and 100 kg separated by a distance of 10 m.

Jupiter ranks ______, among the brightest objects in the night sky.

According to Newton's third law action is equal to reaction so, why horse is able to pull a cart?

A child pulls a suitcase through a distance 10 m on a smooth horizontal floor. The handle held in child's hand makes an angle θ with horizontal surface. If a 5 N force is applied and the horizontal component is half of the applied force.Work done by child in pulling suitcase is

when a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:

The V-I graph for four different wires of different materials having the same length and diameter are shown in the figure. Which one of the following wire has the highest resistivity?

If m is the mass of rod, length l and three similar rods are arranged like 'H', find moment of inertia about the axis passing perpendicularly in one of end of letter 'H'?

The heat of combustion of napthalene, C1oH,(s), at constant volume at 25 C was found to be-5133 kJ mol-. Calculate the value of enthalpy change at constant pressure at the sa me temperature

The initial velocity of an object is 40 m/s. The acceleration a of the object is given by the following expression. a=-0.1 v, where v is the instantaneous velocity of the object. The velocity of the object after 3 seconds will be

Choose the correct pairs from the following:

When a current carrying conductor is clasped in such a way that the thumb faces the direction of current, the direction of the curl of fingers corresponds ___.

A rectangular coil ABCD having a battery connected between its ends A and D is placed in between the pole pieces of a horseshoe magnet as shown. What is the direction of forces on the coil?

An arrow fired from a bow attains a maximum height of 5m from the level it is released. If the mass of the arrow is 500grams, work done by the bow on arrow is greater than which of the following? (Assume, g=10ms−2)

Question 71(i)The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A.At what time did cyclist II rest? How long did the cyclist rest?

Potential energy of a particle at position x is given by U=x^2-2x, then position of particle is at 1] x=02]x=23]x=14]x=0.5

A ball is thrown vertically upward. It has a speed of 10 m/s when it has reached one half of its maximum height. How high does the ball rise?(taking g=10 m/s) 1. 15m 2. 10m 3. 20m 4. 5m

Which of the following is the second nearest star system from Earth? (Considering the Sun to be the closest star to the Earth)

A tennis ball is dropped onto the floor from height 4 m it rebounds to a height of 3m if the ball was in contact with the floor for 0.010 seconds what was its average acceleration during contact

89.What is the power of a plane glass slab?

If the object is moving with uniform velocity in a given interval of time, then the average speed and instantaneous velocity are equal, why?

A boy carries 20kg load from ground level to a height of 10m. He does it in 40 seconds. Calculate the power.

What is the SI unit of mass, weight and force?

An electrical appliance of 500 W is used for 5 hours per day. What will be the energy consumed by the appliance in 30 days?

Name these forces:(a) the upward push of water on a submerged object(b) the force which wears away two surfaces as they move over one another(c) the force which pulled the apple off Isaac Newton's tree.

(i) Write the three equations of uniformly accelerated motion. Give the meaning of each symbol which occurs in them.(ii) A car acquires a velocity of 72 km per hour in 10 seconds starting from rest. Find​ (a) the acceleration, (b) the average velocity, and (c) the distance travelled in this time.

A block of wood floats on the water with 2/3 of its volume submerged . Find its relative density

11.The diagram shows a bar magnet placed in a uniform magnetic field. When the magnet is allowed to move freely, it will (1) remain stationary (2) turn 90^° clockwise (3) turn 90^° anti - clockwise (4) turn 180^° clockwise

A man weighing 60 kg climbs up 45 steps stair case of a building in 9 seconds. If height of each step is 10 cm, then how much power the man has employed?Take g=10 m/s2

Dimension of power?

ntA 200 metre long train moving with velocity 20 metre per second overtakes a man running in the same direction in 20 seconds. how long it will take to overtake the man if is he was running in the opposite direction?n

A stone and the earth attract each other with an equal and opposite force. Why then we see only the stone falling towards the earth but not the earth rising towards the stone?

A boat is rowed across the river at the rate of 4.5km/hr. The river flows at the rate of 6km/hr. The velocity of boat in m/s is 1)2.9 2)3.1 3)2.1 4)5

If the direction of electric current in a solenoid, when viewed from one of its ends, is anticlockwise. The pole of this end of the solenoid is ___ .

Why free electrons move from negative terminal to positive terminal?

An object is subjected to retardation,dv/dt= -5v which has initial velocity of 4 m/s.The time taken by the object to come to rest would be?

Wavelength (λ), frequency (f) and velocity (v) of a sound wave are related as:

A luminous object is placed at a dis†an ce of 30cmfrom the convex lens of focal length 20cm.On the other side of the lens at what dis†an ce from the convex lens a convex mirror of radius of curvature 10cm be placed in order to have an upright image of the object to coincide with it?

A partical at rest falling under gravity such that it travels 53.9m in last second of its journey. total time of fall is

`A uniformly charged hemisphere of radius b and charge density rho has a hemispherical caviety of radius a=b/2 cut from its center . find the potential at the center of the caviety

Howto know which ray will reach the equator?Like cosmic rays cannot reach, what about the other rays?

(i) Write the three equations of uniformly accelerated motion. Give the meaning of each symbol which occurs in them.(ii) A car acquires a velocity of 72 km per hour in 10 seconds starting from rest. Find (a) the acceleration, (b) the average velocity, and (c) the distance travelled in this time.