13232 + Interview Questions in Physics Page 61 InterviewSolution

3001.	In an AC circuit, voltage V and current i are given by :V=200sin100t Volt and i=100sin(100t+π3) mA.The power dissipated in the circuit is W.
Answer» In an $AC$ circuit, voltage $V$ and current $i$ are given by : $V = 200 sin 100 t Volt$ and $i = 100 sin (100 t + \frac{π}{3}) mA$ . The power dissipated in the circuit is $W .$

Discussion

3002.	is void the triangular portion or number of different shapes formed when one layer of atom is placed over the other?
Answer» is void the triangular portion or number of different shapes formed when one layer of atom is placed over the other?

Discussion

3003.	I have a container that is 20cm tall and filled fully with water. The lift accelerates up at 10m/s. What is the pressure difference between the top surface of the water and the bottom of the container? Take density of water as 1kg/l.
Answer» I have a container that is 20cm tall and filled fully with water. The lift accelerates up at 10m/s. What is the pressure difference between the top surface of the water and the bottom of the container? Take density of water as 1kg/l.

Discussion

3004.	If the density of a liquid is 20 g cm-3, height is 4 cm and the gravitational field strength is 10 N kg-1, the pressure at the bottom of the liquid is
Answer» If the density of a liquid is 20 g cm^-3, height is 4 cm and the gravitational field strength is 10 N kg^-1, the pressure at the bottom of the liquid is

Discussion

3005.	A block of mass 10 kg attached to a spring balance is released from rest. What will be the reading of the spring balance during free fall?
Answer» A block of mass 10 kg attached to a spring balance is released from rest. What will be the reading of the spring balance during free fall?

Discussion

3006.	An ion X2+ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.
Answer» An ion $X^{2 +}$ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

Discussion

3007.	(i) If a balloon filled with air and its mouth untied, is released with its mouth in the downward direction, it moves upwards. Why?(ii) An unloaded truck weighing 2000 kg has a maximum acceleration of 0.5 m/s2. What is the maximum acceleration when it is carrying a load of 2000 kg?
Answer» (i) If a balloon filled with air and its mouth untied, is released with its mouth in the downward direction, it moves upwards. Why? (ii) An unloaded truck weighing 2000 kg has a maximum acceleration of 0.5 m/s². What is the maximum acceleration when it is carrying a load of 2000 kg?

Discussion

3008.	In Lenz law, what is th magnetic field of the coil when the bar magnet facing north pole towards the coil is moved away from it??
Answer» In Lenz law, what is th magnetic field of the coil when the bar magnet facing north pole towards the coil is moved away from it??

Discussion

3009.	Q. To the man walking towards east with a speed of 4 km/h, the wind appears to blow from the north. It appears to blow from north-east when he doubles his speed. The absolute velocity and direction of the wind will be:(1) 2 km/h, south-east(2) 2√2 km/h, south-east(3) 4 km/h, south-east(4) 4√2, south-east
Answer» Q. To the man walking towards east with a speed of 4 km/h, the wind appears to blow from the north. It appears to blow from north-east when he doubles his speed. The absolute velocity and direction of the wind will be: (1) 2 km/h, south-east (2) 2√2 km/h, south-east (3) 4 km/h, south-east (4) 4√2, south-east

Discussion

3010.	Why are roads on mountain inclined inwards in turns?
Answer» Why are roads on mountain inclined inwards in turns?

Discussion

3011.	What is gravitional force?
Answer» What is gravitional force?

Discussion

3012.	By inserting a capillary tube upto depth L in water , the water rises to a height h. if the lower end of the capillary tube is closed inside water and capillary is taken out and closed end opened. The length of water remains in the tube is (here L>h) (1) zero (2) L+h (3) 2h (4) h
Answer» By inserting a capillary tube upto depth L in water , the water rises to a height h. if the lower end of the capillary tube is closed inside water and capillary is taken out and closed end opened. The length of water remains in the tube is (here L>h) (1) zero (2) L+h (3) 2h (4) h

Discussion

3013.	Question 24Two quantities are said to vary___with each other, if an increase in one causes a decrease in the other in such a manner that the product of their corresponding values remains constant.
Answer» Question 24 Two quantities are said to vary___with each other, if an increase in one causes a decrease in the other in such a manner that the product of their corresponding values remains constant.

3013.

Question 24Two quantities are said to vary___with each other, if an increase in one causes a decrease in the other in such a manner that the product of their corresponding values remains constant.

Answer»

Question 24

Two quantities are said to vary___with each other, if an increase in one causes a decrease in the other in such a manner that the product of their corresponding values remains constant.

Discussion

3014.	Find equivalent resistance of the given circuit.
Answer» Find equivalent resistance of the given circuit.

3014.

Find equivalent resistance of the given circuit.

Answer»

Find equivalent resistance of the given circuit.

Discussion

3015.	45.Determine work done if force F = 3x along i + 4 along j acts on a particle and displaces it between two points A and B whose coordinate points are
Answer» 45.Determine work done if force F = 3x along i + 4 along j acts on a particle and displaces it between two points A and B whose coordinate points are

Discussion

3016.	consider 3 charges q each,mass m each revolving in a circle of radius R under the influence of the 4th charge Q at the centre of the circle.Find the kinetic energy of the system
Answer» consider 3 charges q each,mass m each revolving in a circle of radius R under the influence of the 4th charge Q at the centre of the circle.Find the kinetic energy of the system

Discussion

3017.	Does the acceleration due to gravity depend on the mass of a body? why or why not?
Answer» Does the acceleration due to gravity depend on the mass of a body? why or why not?

Discussion

3018.	The time period of a simple pendulum is 2 s. Find its frequency.
Answer» The time period of a simple pendulum is 2 s. Find its frequency.

Discussion

3019.	Statement 1: Coal, petroleum, natural gas are all fossil fuels. Statement 2: They are called fossils as they are made from the dead remains of organic matter.
Answer» Statement 1: Coal, petroleum, natural gas are all fossil fuels. Statement 2: They are called fossils as they are made from the dead remains of organic matter.

3019.

Statement 1: Coal, petroleum, natural gas are all fossil fuels. Statement 2: They are called fossils as they are made from the dead remains of organic matter.

Answer»

Statement 1: Coal, petroleum, natural gas are all fossil fuels.

Statement 2: They are called fossils as they are made from the dead remains of organic matter.

Discussion

3020.	Electric current will stop flowing when the potential difference is:
Answer» Electric current will stop flowing when the potential difference is:

Discussion

3021.	A balloon which is ascending at the rate of 12 m/s is 80 metre above the ground, when a stone is dropped. After what time the stone will reach the ground? [Take g=9.8 m/s2]
Answer» A balloon which is ascending at the rate of $12 m/s$ is $80 metre$ above the ground, when a stone is dropped. After what time the stone will reach the ground? [Take $g = 9.8 {m/s}^{2}$ ]

Discussion

3022.	What is a secondary cell ? Name one such cell.
Answer» What is a secondary cell ? Name one such cell.

Discussion

3023.	{Two objects are projected horizontally in opposite directions from the top of a tower with velocities u}}_1{ and u}}_{2 }. Find the time when their velocity vector are perpendicular to each other
Answer» {Two objects are projected horizontally in opposite directions from the top of a tower with velocities u}}_1{ and u}}_{2 }. Find the time when their velocity vector are perpendicular to each other

Discussion

3024.	acceleration of a body is given by the equation a=(4-3v)m/s^2. speed v is in m/s and t is in second. if initial velocity is zero then terminal velocity of the body is
Answer» acceleration of a body is given by the equation a=(4-3v)m/s^2. speed v is in m/s and t is in second. if initial velocity is zero then terminal velocity of the body is

Discussion

3025.	Which one is a fundamental unit ?
Answer» Which one is a fundamental unit ?

Discussion

3026.	The impulse response of the system shown in figure is,
Answer» The impulse response of the system shown in figure is,

Discussion

3027.	What is the role of mediating particles between different forces?
Answer» What is the role of mediating particles between different forces?

Discussion

3028.	Question 70(iv)A man started his journey on his car from Location A and came back. The given graph shows his position at different times during the whole journey.For how many hours did he not move?
Answer» Question 70(iv) A man started his journey on his car from Location A and came back. The given graph shows his position at different times during the whole journey. For how many hours did he not move?

Discussion

3029.	nta particle having mass 1g, charge 1micro columb enter a uniform magnetic field of 2tesla witha velocity of 20m/sn ntcalculate radius of its pathn
Answer» nta particle having mass 1g, charge 1micro columb enter a uniform magnetic field of 2tesla witha velocity of 20m/sn ntcalculate radius of its pathn

Discussion

3030.	Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?
Answer» Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?

Discussion

3031.	A calorimeter of water equivalent 5×10−3 kg contains 25×10−3 kg of water. It takes 3 minutes to cool from 28∘C to 21∘C. When the same calorimeter is filled with 30×10−3 kg of turpentine oil, then it takes 2 minutes to cool from 28∘C to 21∘C. Find the specific heat of turpentine oil.
Answer» A calorimeter of water equivalent $5 \times 10^{- 3} k g$ contains $25 \times 10^{- 3} k g$ of water. It takes 3 minutes to cool from $28^{\circ} C$ to $21^{\circ} C$ . When the same calorimeter is filled with $30 \times 10^{- 3} k g$ of turpentine oil, then it takes 2 minutes to cool from $28^{\circ} C$ to $21^{\circ} C$ . Find the specific heat of turpentine oil.

Discussion

3032.	The image produced by a concave mirror is one quaeter the size of object. If the object is moved 5 cm closer to the mirror, the image will only be half the size of the object. The focal length of mirror is
Answer» The image produced by a concave mirror is one quaeter the size of object. If the object is moved $5 c m$ closer to the mirror, the image will only be half the size of the object. The focal length of mirror is

Discussion

3033.	Define Polar satellite.
Answer» Define Polar satellite.

Discussion

3034.	A body having 5 kg mass is traveling with a certain velocity and has 10 kgms−1 momentum. What will be its kinetic energy?
Answer» A body having 5 kg mass is traveling with a certain velocity and has $10 k g m s^{- 1}$ momentum. What will be its kinetic energy?

Discussion

3035.	The weight of a solid is 80g in air and 50g in a liquid of relative density 1.5. Calculate the relative density of the solid.
Answer» The weight of a solid is 80g in air and 50g in a liquid of relative density 1.5. Calculate the relative density of the solid.

Discussion

3036.	60.If two blocks A & B are moving toward each other with acceleration a and b respectively. Find the net acceleration of block C
Answer» 60.If two blocks A & B are moving toward each other with acceleration a and b respectively. Find the net acceleration of block C

Discussion

3037.	38.name the quantities related to a projectile which have maximum values when the maximum height attained by the projectile is largest. Click here to view details:
Answer» 38.name the quantities related to a projectile which have maximum values when the maximum height attained by the projectile is largest. Click here to view details:

Discussion

3038.	Steel sinks in water but a steel boat floats. Why?
Answer» Steel sinks in water but a steel boat floats. Why?

Discussion

3039.	A cyclist is travelling at 15 mS−1 accelerates at 0.5 ms−2 for 30 s. How far will it travel in this time?
Answer» A cyclist is travelling at 15 $m S^{- 1}$ accelerates at 0.5 $m s^{- 2}$ for 30 s. How far will it travel in this time?

Discussion

3040.	A body of mass 5 kg is moving with a velocity of 10 m s-1. The ratio of its initial kinetic energy and final kinetic energy, if the mass of the body is doubled and its velocity is halved will be
Answer» A body of mass 5 kg is moving with a velocity of 10 m s^-1. The ratio of its initial kinetic energy and final kinetic energy, if the mass of the body is doubled and its velocity is halved will be

Discussion

3041.	A square plate of side l has mass M. What is its moment of inertia about one of its diagonals?
Answer» A square plate of side l has mass M. What is its moment of inertia about one of its diagonals?

Discussion

3042.	An object of mass 20 kg is raised to a height 5 m above the ground. What is its P.E.? If object is allowed to fall, find its K.E. just before touching the ground and also its K.E. when it is half way down. [3 MARKS]
Answer» An object of mass 20 kg is raised to a height 5 m above the ground. What is its P.E.? If object is allowed to fall, find its K.E. just before touching the ground and also its K.E. when it is half way down. [3 MARKS]

Discussion

3043.	A simple pendulum swings with a period of 1.5 s. What would be the period of the pendulum if the length of its string was doubled, the mass of its bob were cut in half, and the force of gravity was doubled?
Answer» A simple pendulum swings with a period of 1.5 s. What would be the period of the pendulum if the length of its string was doubled, the mass of its bob were cut in half, and the force of gravity was doubled?

3043.

A simple pendulum swings with a period of 1.5 s. What would be the period of the pendulum if the length of its string was doubled, the mass of its bob were cut in half, and the force of gravity was doubled?

Answer»

A simple pendulum swings with a period of 1.5 s. What would be the period of the pendulum if the length of its string was doubled, the mass of its bob were cut in half, and the force of gravity was doubled?

Discussion

3044.	The SI unit of pressure and thrust are respectively:
Answer» The SI unit of pressure and thrust are respectively:

Discussion

3045.	Find the gravitational potential energy of 2.5 kg mass kept at a height of 15 m above the ground. The force of gravity on mass 1 kg is 10 N.
Answer» Find the gravitational potential energy of 2.5 kg mass kept at a height of 15 m above the ground. The force of gravity on mass 1 kg is 10 N.

Discussion

3046.	29. Explain motional EMF briefly? And it's variation of potential difference
Answer» 29. Explain motional EMF briefly? And it's variation of potential difference

Discussion

3047.	if the velocity is uniform then which physical quantity is always zero?
Answer» if the velocity is uniform then which physical quantity is always zero?

Discussion

3048.	Does gravity really exist?
Answer» Does gravity really exist?

Discussion

3049.	550 kJ per cycle workmis done by 1 mol of an ideal gas in a cyclic process. The amount of heat absorbed by the system in one cycle is??
Answer» 550 kJ per cycle workmis done by 1 mol of an ideal gas in a cyclic process. The amount of heat absorbed by the system in one cycle is??

Discussion

3050.	Two resistors 2 Ω and 5 Ω are connected in series with a 7 V battery. Find the potential difference across the 5 Ω resistor.
Answer» Two resistors $2 Ω$ and $5 Ω$ are connected in series with a $7 V$ battery. Find the potential difference across the $5 Ω$ resistor.

3050.

Two resistors 2 Ω and 5 Ω are connected in series with a 7 V battery. Find the potential difference across the 5 Ω resistor.

Answer»

Two resistors $2 Ω$ and $5 Ω$ are connected in series with a $7 V$ battery. Find the potential difference across the $5 Ω$ resistor.

Discussion

Explore topic-wise InterviewSolutions in .

In an AC circuit, voltage V and current i are given by :V=200sin100t Volt and i=100sin(100t+π3) mA.The power dissipated in the circuit is W.

is void the triangular portion or number of different shapes formed when one layer of atom is placed over the other?

I have a container that is 20cm tall and filled fully with water. The lift accelerates up at 10m/s. What is the pressure difference between the top surface of the water and the bottom of the container? Take density of water as 1kg/l.

If the density of a liquid is 20 g cm-3, height is 4 cm and the gravitational field strength is 10 N kg-1, the pressure at the bottom of the liquid is

A block of mass 10 kg attached to a spring balance is released from rest. What will be the reading of the spring balance during free fall?

An ion X2+ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

(i) If a balloon filled with air and its mouth untied, is released with its mouth in the downward direction, it moves upwards. Why?​(ii) An unloaded truck weighing 2000 kg has a maximum acceleration of 0.5 m/s2. What is the maximum acceleration when it is carrying a load of 2000 kg?

In Lenz law, what is th magnetic field of the coil when the bar magnet facing north pole towards the coil is moved away from it??

Why are roads on mountain inclined inwards in turns?

What is gravitional force?

By inserting a capillary tube upto depth L in water , the water rises to a height h. if the lower end of the capillary tube is closed inside water and capillary is taken out and closed end opened. The length of water remains in the tube is (here L>h) (1) zero (2) L+h (3) 2h (4) h

Question 24Two quantities are said to vary___with each other, if an increase in one causes a decrease in the other in such a manner that the product of their corresponding values remains constant.

Find equivalent resistance of the given circuit.

45.Determine work done if force F = 3x along i + 4 along j acts on a particle and displaces it between two points A and B whose coordinate points are

consider 3 charges q each,mass m each revolving in a circle of radius R under the influence of the 4th charge Q at the centre of the circle.Find the kinetic energy of the system

Does the acceleration due to gravity depend on the mass of a body? why or why not?

The time period of a simple pendulum is 2 s. Find its frequency.

Statement 1: Coal, petroleum, natural gas are all fossil fuels. Statement 2: They are called fossils as they are made from the dead remains of organic matter.

Electric current will stop flowing when the potential difference is:

A balloon which is ascending at the rate of 12 m/s is 80 metre above the ground, when a stone is dropped. After what time the stone will reach the ground? [Take g=9.8 m/s2]

What is a secondary cell ? Name one such cell.

{Two objects are projected horizontally in opposite directions from the top of a tower with velocities u}}_1{ and u}}_{2 }. Find the time when their velocity vector are perpendicular to each other

acceleration of a body is given by the equation a=(4-3v)m/s^2. speed v is in m/s and t is in second. if initial velocity is zero then terminal velocity of the body is

Which one is a fundamental unit ?

The impulse response of the system shown in figure is,

What is the role of mediating particles between different forces?

Question 70(iv)A man started his journey on his car from Location A and came back. The given graph shows his position at different times during the whole journey.​For how many hours did he not move?

nta particle having mass 1g, charge 1micro columb enter a uniform magnetic field of 2tesla witha velocity of 20m/sn ntcalculate radius of its pathn

Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?

The image produced by a concave mirror is one quaeter the size of object. If the object is moved 5 cm closer to the mirror, the image will only be half the size of the object. The focal length of mirror is

Define Polar satellite.

A body having 5 kg mass is traveling with a certain velocity and has 10 kgms−1 momentum. What will be its kinetic energy?

The weight of a solid is 80g in air and 50g in a liquid of relative density 1.5. Calculate the relative density of the solid.

60.If two blocks A & B are moving toward each other with acceleration a and b respectively. Find the net acceleration of block C

38.name the quantities related to a projectile which have maximum values when the maximum height attained by the projectile is largest. Click here to view details:

Steel sinks in water but a steel boat floats. Why?

A cyclist is travelling at 15 mS−1 accelerates at 0.5 ms−2 for 30 s. How far will it travel in this time?

A body of mass 5 kg is moving with a velocity of 10 m s-1. The ratio of its initial kinetic energy and final kinetic energy, if the mass of the body is doubled and its velocity is halved will be

A square plate of side l has mass M. What is its moment of inertia about one of its diagonals?

An object of mass 20 kg is raised to a height 5 m above the ground. What is its P.E.? If object is allowed to fall, find its K.E. just before touching the ground and also its K.E. when it is half way down. [3 MARKS]

A simple pendulum swings with a period of 1.5 s. What would be the period of the pendulum if the length of its string was doubled, the mass of its bob were cut in half, and the force of gravity was doubled?

The SI unit of pressure and thrust are respectively:

Find the gravitational potential energy of 2.5 kg mass kept at a height of 15 m above the ground. The force of gravity on mass 1 kg is 10 N.

29. Explain motional EMF briefly? And it's variation of potential difference

if the velocity is uniform then which physical quantity is always zero?

Does gravity really exist?

550 kJ per cycle workmis done by 1 mol of an ideal gas in a cyclic process. The amount of heat absorbed by the system in one cycle is??

Two resistors 2 Ω and 5 Ω are connected in series with a 7 V battery. Find the potential difference across the 5 Ω resistor.

(i) If a balloon filled with air and its mouth untied, is released with its mouth in the downward direction, it moves upwards. Why?(ii) An unloaded truck weighing 2000 kg has a maximum acceleration of 0.5 m/s2. What is the maximum acceleration when it is carrying a load of 2000 kg?

Question 70(iv)A man started his journey on his car from Location A and came back. The given graph shows his position at different times during the whole journey.For how many hours did he not move?