6277 + Interview Questions in Physics Page 69 InterviewSolution

3401.	Question 2Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 50 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C?
Answer» Question 2 Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 50 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C?

Discussion

3402.	Laser light of wavelength 660nm is used to weld a retina detachment. If the pulse has width 60 ms and power 0.5 KW the approximate number of photons in the pulse are?
Answer» Laser light of wavelength 660nm is used to weld a retina detachment. If the pulse has width 60 ms and power 0.5 KW the approximate number of photons in the pulse are?

Discussion

3403.	the displacement of a particle from a point having position vector 2i+4j to another point having position vector 5i+j=
Answer» the displacement of a particle from a point having position vector 2i+4j to another point having position vector 5i+j=

Discussion

3404.	The mode of heat transfer between the earth and the sun is -
Answer» The mode of heat transfer between the earth and the sun is -

Discussion

3405.	Question 20Find the energy in kWh consumed in 10 hours by four devices of power 500 W each.
Answer» Question 20 Find the energy in kWh consumed in 10 hours by four devices of power 500 W each.

Discussion

3406.	Displacement of particle is x=4(cos22/7t + sin22/7t) .the amplitude of particle is
Answer» Displacement of particle is x=4(cos22/7t + sin22/7t) .the amplitude of particle is

Discussion

3407.	If work done by internal conservative force on a body is positive then comment on the change in kinetic and potential energy of the syste
Answer» If work done by internal conservative force on a body is positive then comment on the change in kinetic and potential energy of the syste

Discussion

3408.	Four arrangements to measure the temperature of the ice in a beaker with a laboratory thermometer are shown in the figure. Which one of them shows the correct arrangement for accurate measurement of temperature?
Answer» Four arrangements to measure the temperature of the ice in a beaker with a laboratory thermometer are shown in the figure. Which one of them shows the correct arrangement for accurate measurement of temperature?

Discussion

3409.	Question 16A motorcyclist drives from A to B with a uniform speed of 30 kmph and returns back with a speed of 20 kmph . Find its average speed.
Answer» Question 16 A motorcyclist drives from A to B with a uniform speed of $30 k m p h$ and returns back with a speed of $20 k m p h$ . Find its average speed.

Discussion

3410.	A force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___m.
Answer» A force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___m.

Discussion

3411.	A boy whose eyes are 150 cm above the ground looks at his reflection in a vertical mirror 200 cm away. the top and bottom of the mirror are 220 cm and 120 cm above the ground resp. What length below his eyes can he see of himself in the mirror?
Answer» A boy whose eyes are 150 cm above the ground looks at his reflection in a vertical mirror 200 cm away. the top and bottom of the mirror are 220 cm and 120 cm above the ground resp. What length below his eyes can he see of himself in the mirror?

Discussion

3412.	In solar furnaces, concave mirrors are used for converging the sun's rays. Can we use a convex lens for converging the rays?
Answer» In solar furnaces, concave mirrors are used for converging the sun's rays. Can we use a convex lens for converging the rays?

Discussion

3413.	A boy of mass 40 kg runs up a staircase of 40 steps in 10 s. If the height of each step is 25 cm, what is the power of the boy?Take, g=10 m/s2
Answer» A boy of mass $40 kg$ runs up a staircase of $40$ steps in $10 s$ . If the height of each step is $25 cm$ , what is the power of the boy? Take, $g = 10 {m/s}^{2}$

Discussion

3414.	Question 29Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.
Answer» Question 29 Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.

Discussion

3415.	A motor vehicle travelled the first one third of a dis†an ce s at a speed of 10km/h, next one third at a speed of 20km/h and the last one third at a speed of 60km/h. Determine the mean speed of the vehicle over the entire dis†an ce s
Answer» A motor vehicle travelled the first one third of a dis†an ce s at a speed of 10km/h, next one third at a speed of 20km/h and the last one third at a speed of 60km/h. Determine the mean speed of the vehicle over the entire dis†an ce s

Discussion

3416.	Figureshows four cells fixed on a board. Draw lines to indicate how youwill connect their terminals with wires to make a battery of fourcells.
Answer» Figure shows four cells fixed on a board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.

3416.

Figureshows four cells fixed on a board. Draw lines to indicate how youwill connect their terminals with wires to make a battery of fourcells.

Answer»

Figure
shows four cells fixed on a board. Draw lines to indicate how you
will connect their terminals with wires to make a battery of four
cells.

Discussion

3417.	Who is telling lies?a. Light year is used to measures time.b. End stage of a star depends on its initial mass.c. A star ends its life as a neutron star when the pressure of its electrons balances its gravity.d. Only light can emit from the blank hole.e. The sun will pass through the supergiant stage during its evolution.f. The Sun will end its life as a white dwarf.
Answer» Who is telling lies? a. Light year is used to measures time. b. End stage of a star depends on its initial mass. c. A star ends its life as a neutron star when the pressure of its electrons balances its gravity. d. Only light can emit from the blank hole. e. The sun will pass through the supergiant stage during its evolution. f. The Sun will end its life as a white dwarf.

Discussion

3418.	If each side of a square of side a is tripled, what is the area of the new square formed?
Answer» If each side of a square of side $a$ is tripled, what is the area of the new square formed?

Discussion

3419.	Explain how distance can be calculated by a velocity-time graph?
Answer» Explain how distance can be calculated by a velocity-time graph?

Discussion

3420.	58.Why does a bullet fired against a glass window pan make a hole in it and the glass pan does not crack , while a stone striking the same glass pane will smash it
Answer» 58.Why does a bullet fired against a glass window pan make a hole in it and the glass pan does not crack , while a stone striking the same glass pane will smash it

Discussion

3421.	An irregular solid, when placed on a centimetre graph paper and outline is drawn, covers 8 complete square and 14 incomplete squares. What is the approximate area bounded by the outline?
Answer» An irregular solid, when placed on a centimetre graph paper and outline is drawn, covers 8 complete square and 14 incomplete squares. What is the approximate area bounded by the outline?

Discussion

3422.	Why do bursting of balloon sound similar to lightning
Answer» Why do bursting of balloon sound similar to lightning

Discussion

3423.	If the speed of a car is 20 ms−1, what is the speed in km h−1?
Answer» If the speed of a car is $20 m s^{- 1}$ , what is the speed in $k m h^{- 1}$ ?

Discussion

3424.	What are the factors responsible for the generation of wind currents on Earth? [2 MARKS]
Answer» What are the factors responsible for the generation of wind currents on Earth? [2 MARKS]

Discussion

3425.	What is the reason that sound travels through a wooden partition but not so easily through a wall?
Answer» What is the reason that sound travels through a wooden partition but not so easily through a wall?

Discussion

3426.	Give one example of a situation in which a body has a certain average speed but its average velocity is zero.
Answer» Give one example of a situation in which a body has a certain average speed but its average velocity is zero.

Discussion

3427.	equatoin of motion along x axis is given by t=\sqrt[{}]x+3. time at which particle will be at rest.
Answer» equatoin of motion along x axis is given by t=\sqrt[{}]x+3. time at which particle will be at rest.

Discussion

3428.	How to convert Fahrenheit to degree Celsius and how to convert degree Celsius to Fahrenheit?
Answer» How to convert Fahrenheit to degree Celsius and how to convert degree Celsius to Fahrenheit?

Discussion

3429.	A plane mirror whose reflecting surface is parallel to x-y plane is moving with a velocity of 2i+3j+4k m/s. an object is moving with a velocity of i+j-k m/s. The velocityof the image is
Answer» A plane mirror whose reflecting surface is parallel to x-y plane is moving with a velocity of 2i+3j+4k m/s. an object is moving with a velocity of i+j-k m/s. The velocityof the image is

Discussion

3430.	if magnetic field lines are drawn by keeping magnet vertical , the no. of neutral points will be
Answer» if magnetic field lines are drawn by keeping magnet vertical , the no. of neutral points will be

Discussion

3431.	What is a constellation? Name any two constellations. [3 MARKS]
Answer» What is a constellation? Name any two constellations. [3 MARKS]

Discussion

3432.	Half life of a substance is 20 mnt.The time elapsed between 33% &67 % decay is:-
Answer» Half life of a substance is 20 mnt.The time elapsed between 33% &67 % decay is:-

Discussion

3433.	Difference between magnitude of average velocity and average speed?
Answer» Difference between magnitude of average velocity and average speed?

Discussion

3434.	In the following system, the holes of the same size A and B are made at the same level. Let the speed of the water emerging from the two holes be vA and vB respectively. Which among the following option is correct?
Answer» In the following system, the holes of the same size A and B are made at the same level. Let the speed of the water emerging from the two holes be $v_{A}$ and $v_{B}$ respectively. Which among the following option is correct?

Discussion

3435.	When a toy of irregular shape is immersed in a measuring cylinder containing water of 20 ml, the water rises to 37 ml, then the volume of the toy is:
Answer» When a toy of irregular shape is immersed in a measuring cylinder containing water of $20 m l$ , the water rises to $37 m l$ , then the volume of the toy is:

Discussion

3436.	How many electrons are electrons are present in 0.1 moles of (PO_{4 })^{3-} ions
Answer» How many electrons are electrons are present in 0.1 moles of (PO_{4 })^{3-} ions

Discussion

3437.	Describe Plan A and its consequences.
Answer» Describe Plan A and its consequences.

Discussion

3438.	A ball is dropped from the top of a tall tower. Theratio of change in kinetic energy of the ball in firstand third second of its motion will be(1) 1:5(2) 1:9(3) 1:3(4) 1:8
Answer» A ball is dropped from the top of a tall tower. Theratio of change in kinetic energy of the ball in firstand third second of its motion will be(1) 1:5(2) 1:9(3) 1:3(4) 1:8

Discussion

3439.	State whether the statements are True or False. Question 29The distance of the point (3,5) from the Y-axis is 5.
Answer» State whether the statements are True or False. Question 29 The distance of the point (3,5) from the Y-axis is 5.

Discussion

3440.	Choose the correct option: Statement 1: The following figure correctly represents the conventional direction of flow of current. Statement 2: The actual direction of flow of electron is opposite to the conventional direction of flow of current.
Answer» Choose the correct option: Statement 1: The following figure correctly represents the conventional direction of flow of current. Statement 2: The actual direction of flow of electron is opposite to the conventional direction of flow of current.

3440.

Choose the correct option: Statement 1: The following figure correctly represents the conventional direction of flow of current. Statement 2: The actual direction of flow of electron is opposite to the conventional direction of flow of current.

Answer»

Choose the correct option:

Statement 1: The following figure correctly represents the conventional direction of flow of current.

Statement 2: The actual direction of flow of electron is opposite to the conventional direction of flow of current.

Discussion

3441.	Why the stringed instruments are provided with hollow boxes?
Answer» Why the stringed instruments are provided with hollow boxes?

Discussion

3442.	Anemometer is used to measure:
Answer» Anemometer is used to measure:

Discussion

3443.	Why optician's use plane mirror?
Answer» Why optician's use plane mirror?

Discussion

3444.	positive charge Q is distributed uniformly over a circular ring of radius R .A particle having a mass m and a negative charge q ,is placed on its axis at a distance x from the centre . Find the force on the particle .assuming x
Answer» positive charge Q is distributed uniformly over a circular ring of radius R .A particle having a mass m and a negative charge q ,is placed on its axis at a distance x from the centre . Find the force on the particle .assuming x<

Discussion

3445.	The reflection of light from a given surface depends upon which of the following factor(s)?
Answer» The reflection of light from a given surface depends upon which of the following factor(s)?

Discussion

3446.	what is electric potential and electric potential energy? what is difference between both?
Answer» what is electric potential and electric potential energy? what is difference between both?

Discussion

3447.	An electric heater is rated at 1500 Watt. What would be the electrical energy consumed by it in 2 hours.
Answer» An electric heater is rated at 1500 Watt. What would be the electrical energy consumed by it in 2 hours.

Discussion

3448.	110.The electric feild at a point due to a point charge is 30N/C and the electric potential at that point is 15J/C.Calculate the distance of the point from the charge and the magnitude of the charge.
Answer» 110.The electric feild at a point due to a point charge is 30N/C and the electric potential at that point is 15J/C.Calculate the distance of the point from the charge and the magnitude of the charge.

Discussion

3449.	Name two good conductors and two insulators of heat.
Answer» Name two good conductors and two insulators of heat.

Discussion

3450.	The heat radiation travels in vacuum with speed
Answer» The heat radiation travels in vacuum with speed

Discussion

Explore topic-wise InterviewSolutions in .

Question 2Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 50 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C?

Laser light of wavelength 660nm is used to weld a retina detachment. If the pulse has width 60 ms and power 0.5 KW the approximate number of photons in the pulse are?

the displacement of a particle from a point having position vector 2i+4j to another point having position vector 5i+j=

The mode of heat transfer between the earth and the sun is -

Question 20Find the energy in kWh consumed in 10 hours by four devices of power 500 W each.

Displacement of particle is x=4(cos22/7t + sin22/7t) .the amplitude of particle is

If work done by internal conservative force on a body is positive then comment on the change in kinetic and potential energy of the syste

Four arrangements to measure the temperature of the ice in a beaker with a laboratory thermometer are shown in the figure. Which one of them shows the correct arrangement for accurate measurement of temperature?

Question 16A motorcyclist drives from A to B with a uniform speed of 30 kmph and returns back with a speed of 20 kmph . Find its average speed.

A force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___m.

A boy whose eyes are 150 cm above the ground looks at his reflection in a vertical mirror 200 cm away. the top and bottom of the mirror are 220 cm and 120 cm above the ground resp. What length below his eyes can he see of himself in the mirror?

In solar furnaces, concave mirrors are used for converging the sun's rays. Can we use a convex lens for converging the rays?

A boy of mass 40 kg runs up a staircase of 40 steps in 10 s. If the height of each step is 25 cm, what is the power of the boy?Take, g=10 m/s2

Question 29Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.

A motor vehicle travelled the first one third of a dis†an ce s at a speed of 10km/h, next one third at a speed of 20km/h and the last one third at a speed of 60km/h. Determine the mean speed of the vehicle over the entire dis†an ce s

Figureshows four cells fixed on a board. Draw lines to indicate how youwill connect their terminals with wires to make a battery of fourcells.

If each side of a square of side a is tripled, what is the area of the new square formed?

Explain how distance can be calculated by a velocity-time graph?

58.Why does a bullet fired against a glass window pan make a hole in it and the glass pan does not crack , while a stone striking the same glass pane will smash it

An irregular solid, when placed on a centimetre graph paper and outline is drawn, covers 8 complete square and 14 incomplete squares. What is the approximate area bounded by the outline?

Why do bursting of balloon sound similar to lightning

If the speed of a car is 20 ms−1, what is the speed in km h−1?

What are the factors responsible for the generation of wind currents on Earth? [2 MARKS]

What is the reason that sound travels through a wooden partition but not so easily through a wall?

Give one example of a situation in which a body has a certain average speed but its average velocity is zero.

equatoin of motion along x axis is given by t=\sqrt[{}]x+3. time at which particle will be at rest.

How to convert Fahrenheit to degree Celsius and how to convert degree Celsius to Fahrenheit?

A plane mirror whose reflecting surface is parallel to x-y plane is moving with a velocity of 2i+3j+4k m/s. an object is moving with a velocity of i+j-k m/s. The velocityof the image is

if magnetic field lines are drawn by keeping magnet vertical , the no. of neutral points will be

What is a constellation? Name any two constellations. [3 MARKS]

Half life of a substance is 20 mnt.The time elapsed between 33% &67 % decay is:-

Difference between magnitude of average velocity and average speed?

In the following system, the holes of the same size A and B are made at the same level. Let the speed of the water emerging from the two holes be vA and vB respectively. Which among the following option is correct?

When a toy of irregular shape is immersed in a measuring cylinder containing water of 20 ml, the water rises to 37 ml, then the volume of the toy is:

How many electrons are electrons are present in 0.1 moles of (PO_{4 })^{3-} ions

Describe Plan A and its consequences.

A ball is dropped from the top of a tall tower. Theratio of change in kinetic energy of the ball in firstand third second of its motion will be(1) 1:5(2) 1:9(3) 1:3(4) 1:8

State whether the statements are True or False. Question 29The distance of the point (3,5) from the Y-axis is 5.

Choose the correct option: Statement 1: The following figure correctly represents the conventional direction of flow of current. Statement 2: The actual direction of flow of electron is opposite to the conventional direction of flow of current.

Why the stringed instruments are provided with hollow boxes?

Anemometer is used to measure:

Why optician's use plane mirror?

positive charge Q is distributed uniformly over a circular ring of radius R .A particle having a mass m and a negative charge q ,is placed on its axis at a distance x from the centre . Find the force on the particle .assuming x

The reflection of light from a given surface depends upon which of the following factor(s)?

what is electric potential and electric potential energy? what is difference between both?

An electric heater is rated at 1500 Watt. What would be the electrical energy consumed by it in 2 hours.

110.The electric feild at a point due to a point charge is 30N/C and the electric potential at that point is 15J/C.Calculate the distance of the point from the charge and the magnitude of the charge.

Name two good conductors and two insulators of heat.

The heat radiation travels in vacuum with speed