13232 + Interview Questions in Physics Page 132 InterviewSolution

6551.	a car is negotiating a circular turn with banking angle theta .if keeping the banking angle same if speed is increased by 1%.what should be percentage change in radius so that car can negotiate turns safely.
Answer» a car is negotiating a circular turn with banking angle theta .if keeping the banking angle same if speed is increased by 1%.what should be percentage change in radius so that car can negotiate turns safely.

Discussion

6552.	A light wave has a frequency of 4×1014 Hz and a wavelength of 5×10−7 m in a medium. The refractive index of the medium is
Answer» A light wave has a frequency of $4 \times 10^{14} Hz$ and a wavelength of $5 \times 10^{- 7} m$ in a medium. The refractive index of the medium is

Discussion

6553.	A spring executes shm with mass 10kg attached to it. The force Constant of spring is 10N/m .if at any instant its velocity is 40cm/sec,the displacement will be(amplitude is 0.5m)
Answer» A spring executes shm with mass 10kg attached to it. The force Constant of spring is 10N/m .if at any instant its velocity is 40cm/sec,the displacement will be(amplitude is 0.5m)

Discussion

6554.	The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ? (a) 340 (b) 5170 (c) 1280 (d) 1530
Answer» The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ? (a) 340 (b) 5170 (c) 1280 (d) 1530

6554.

The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ? (a) 340 (b) 5170 (c) 1280 (d) 1530

Answer»

The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ?

(a) 340

(b) 5170

(c) 1280

(d) 1530

Discussion

6555.	Why a frog cant eat a scorpion?
Answer» Why a frog cant eat a scorpion?

Discussion

6556.	What is a free fall
Answer» What is a free fall

Discussion

6557.	Two bodies of masses 2kg & 6kg are separated by a certain distance. If the body of mass 6kg is moved 2m towards right, then by how much distance the body of 2kg mass must be moved so that the centre of mass of the final system remains same as that of the initial system?
Answer» Two bodies of masses 2kg & 6kg are separated by a certain distance. If the body of mass 6kg is moved 2m towards right, then by how much distance the body of 2kg mass must be moved so that the centre of mass of the final system remains same as that of the initial system?

Discussion

6558.	State two applications of universal law of gravitation. What happens to the gravitational force between two objects when the distance between them is:(i) Doubled?(ii) Halved?
Answer» State two applications of universal law of gravitation. What happens to the gravitational force between two objects when the distance between them is: (i) Doubled? (ii) Halved?

Discussion

6559.	28. A ball of mass m hits a floor with a speed vmaking an angle a with the normal N. Thecoefficient of restitution is e. The angle made byreflected ball with floor isN(2) tan (ecot o)(1) cot 1(ecot a)
Answer» 28. A ball of mass m hits a floor with a speed vmaking an angle a with the normal N. Thecoefficient of restitution is e. The angle made byreflected ball with floor isN(2) tan (ecot o)(1) cot 1(ecot a)

Discussion

6560.	Relative density of substance is
Answer» Relative density of substance is

Discussion

6561.	Question 22The earth is acted upon by gravitation of Sun, even though it does not fall into the Sun. Why?
Answer» Question 22 The earth is acted upon by gravitation of Sun, even though it does not fall into the Sun. Why?

Discussion

6562.	What is free fall?
Answer» What is free fall?

Discussion

6563.	An enemy plane is at a distance of 300 km from a radar. In how much time will the radar be able to detect the plane? Take velocity of radio waves as 3×108 m/s
Answer» An enemy plane is at a distance of 300 km from a radar. In how much time will the radar be able to detect the plane? Take velocity of radio waves as $3 \times 10^{8} m / s$

Discussion

6564.	32. A particle oscillates along the x-axis according to equationx=0.05sin(5t-/6)where x is in metre and t is in second .find its velocity at t=0 second
Answer» 32. A particle oscillates along the x-axis according to equationx=0.05sin(5t-/6)where x is in metre and t is in second .find its velocity at t=0 second

Discussion

6565.	An aluminium ball is fully immersed in distilled water, well water, sea water and inland lake water, one by one. The aluminium ball will appear to suffer the maximum loss in weight when immersed in :(1) distilled water(2) sea water(3) well water(4) lake water
Answer» An aluminium ball is fully immersed in distilled water, well water, sea water and inland lake water, one by one. The aluminium ball will appear to suffer the maximum loss in weight when immersed in : (1) distilled water (2) sea water (3) well water (4) lake water

Discussion

6566.	A ball is whirled on the end of a string in a horizontal circle of radius R at constant speed v. The centripetal acceleration of the ball can be increased by a factor of 4 by:
Answer» A ball is whirled on the end of a string in a horizontal circle of radius R at constant speed v. The centripetal acceleration of the ball can be increased by a factor of 4 by:

Discussion

6567.	A car travels a distance of 200 km from Delhi to Ambala towards north in 5 hours.Calculate velocity of the car for this journey.
Answer» A car travels a distance of 200 km from Delhi to Ambala towards north in 5 hours.Calculate velocity of the car for this journey.

Discussion

6568.	Light travels through a glass plate of thickness t and having a refractive index μ. If c is the velocity of light in vacuum, the time taken by light to travel this thickness of glass is
Answer» Light travels through a glass plate of thickness $t$ and having a refractive index $μ$ . If $c$ is the velocity of light in vacuum, the time taken by light to travel this thickness of glass is

Discussion

6569.	Which of these will be a leap year?
Answer» Which of these will be a leap year?

Discussion

6570.	Why the space rockets are generally launched from west to east?
Answer» Why the space rockets are generally launched from west to east?

Discussion

6571.	Explain the terms crest and trough in relation to a transverse wave.
Answer» Explain the terms crest and trough in relation to a transverse wave.

Discussion

6572.	Solve the following(1) If the weight of a body on the surface of the moon is 100N, what is its mass? (61.34 kg)(2) If the acceleration due to gravity one the surface of the earth is 9.8 ms2 what will be the acceleration due to gravity on the surface of a planet whose mass and radius both are two times the corresponding quantities for the earth? (4.9 m/s2).
Answer» Solve the following (1) If the weight of a body on the surface of the moon is 100N, what is its mass? (61.34 kg) (2) If the acceleration due to gravity one the surface of the earth is 9.8 ms² what will be the acceleration due to gravity on the surface of a planet whose mass and radius both are two times the corresponding quantities for the earth? (4.9 m/s²).

6572.

Solve the following(1) If the weight of a body on the surface of the moon is 100N, what is its mass? (61.34 kg)(2) If the acceleration due to gravity one the surface of the earth is 9.8 ms2 what will be the acceleration due to gravity on the surface of a planet whose mass and radius both are two times the corresponding quantities for the earth? (4.9 m/s2).

Answer»

Solve the following

(1) If the weight of a body on the surface of the moon is 100N, what is its mass? (61.34 kg)

(2) If the acceleration due to gravity one the surface of the earth is 9.8 ms² what will be the acceleration due to gravity on the surface of a planet whose mass and radius both are two times the corresponding quantities for the earth? (4.9 m/s²).

Discussion

6573.	A balll thrown vertically upwards with a speed 'u' from the top of a tower reaches the ground in 9 seconds . Another ball thrown vertically downwards from the same position with the same speed 'u' ,takes 4 seconds to reach ground.Calculate the value of 'u'.(Take g = 10m/s^2)
Answer» A balll thrown vertically upwards with a speed 'u' from the top of a tower reaches the ground in 9 seconds . Another ball thrown vertically downwards from the same position with the same speed 'u' , takes 4 seconds to reach ground. Calculate the value of 'u'. (Take g = 10m/s^2)

Discussion

6574.	What is the angle between the Direction of E axial and E equatorial
Answer» What is the angle between the Direction of E axial and E equatorial

Discussion

6575.	Resistors R1=10Ω, R2 = 40Ω, R3 = 30Ω, R4 = 20Ω, R5 = 60Ω and a 12V battery is connected as shown.Calculate:(a) the total resistance(b) the total current flowing in the circuit. [3 MARKS]
Answer» Resistors $R_{1}$ =10 $Ω$ , $R_{2}$ = 40 $Ω$ , $R_{3}$ = 30 $Ω$ , $R_{4}$ = 20 $Ω$ , $R_{5}$ = 60 $Ω$ and a 12V battery is connected as shown. Calculate: (a) the total resistance (b) the total current flowing in the circuit. [3 MARKS]

6575.

Resistors R1=10Ω, R2 = 40Ω, R3 = 30Ω, R4 = 20Ω, R5 = 60Ω and a 12V battery is connected as shown.Calculate:(a) the total resistance(b) the total current flowing in the circuit. [3 MARKS]

Answer»

Resistors $R_{1}$ =10 $Ω$ , $R_{2}$ = 40 $Ω$ , $R_{3}$ = 30 $Ω$ , $R_{4}$ = 20 $Ω$ , $R_{5}$ = 60 $Ω$ and a 12V battery is connected as shown.

Calculate:

(a) the total resistance

(b) the total current flowing in the circuit. [3 MARKS]

Discussion

6576.	what is the difference between the heat generated and power dissipated in a resistor What are thier formulas
Answer» what is the difference between the heat generated and power dissipated in a resistor What are thier formulas

Discussion

6577.	What is meaning of having energy
Answer» What is meaning of having energy

Discussion

6578.	Name the S.I unit of heat .How is it related to unit calorie?
Answer» Name the S.I unit of heat .How is it related to unit calorie?

Discussion

6579.	The coordinates of a moving particle at any time 't' are given byx= ∝t3 and y=βt3.The speed of the particle at time 't' is
Answer» The coordinates of a moving particle at any time 't' are given by x= ∝t³ and y=βt³. The speed of the particle at time 't' is

6579.

The coordinates of a moving particle at any time 't' are given byx= ∝t3 and y=βt3.The speed of the particle at time 't' is

Answer»

The coordinates of a moving particle at any time 't' are given by
x= ∝t³ and y=βt³.
The speed of the particle at time 't' is

Discussion

6580.	Write answers to the following questions in your own words.(a) Why is the weight of the same object different on different planets?(b) What precautions will you take to make accurate measurements in day-to-day affairs?(c) What is the difference between mass and weight?
Answer» Write answers to the following questions in your own words. (a) Why is the weight of the same object different on different planets? (b) What precautions will you take to make accurate measurements in day-to-day affairs? (c) What is the difference between mass and weight?

Discussion

6581.	An aluminium piece of mass 50g initially at 300∘C is dipped quickly and taken out of 1kg of water, initially at 30∘C. If the temperature of the aluminium piece be 160∘C, what is the temperature of the water then (Specific heat capacities of aluminium and water are 900 JKg−1K−1 and 4200 Jkg−1k−1, respectively)
Answer» An aluminium piece of mass 50g initially at $300^{\circ} C$ is dipped quickly and taken out of 1kg of water, initially at $30^{\circ} C$ . If the temperature of the aluminium piece be $160 \circ C$ , what is the temperature of the water then (Specific heat capacities of aluminium and water are 900 $J K g^{- 1} K^{- 1}$ and 4200 $J k g^{- 1} k^{- 1}$ , respectively)

Discussion

6582.	The mass of a coin in air is 100 g. When it is completely immersed in water, its weight reduces by 0.061 N. The mass of water displaced by the coin is (Take g =9.8 ms−2)
Answer» The mass of a coin in air is 100 g. When it is completely immersed in water, its weight reduces by 0.061 N. The mass of water displaced by the coin is (Take g $= 9.8 m s^{- 2}$ )

Discussion

6583.	A BODY TRAVELS 10 METRE IN FIRST THREE SECONDS AND 15 METRE IN THE NEXT FOUR SECONDS. WHAT IS THE VELOCITY AT THE END OF EIGHTH SECOND ?
Answer» A BODY TRAVELS 10 METRE IN FIRST THREE SECONDS AND 15 METRE IN THE NEXT FOUR SECONDS. WHAT IS THE VELOCITY AT THE END OF EIGHTH SECOND ?

Discussion

6584.	Why does a freely falling object has non-uniform motion. [1 MARK]
Answer» Why does a freely falling object has non-uniform motion. [1 MARK]

Discussion

6585.	If the acceleration due to gravity on Mars is more than that of Earth, then the weight of the object on Mars will be
Answer» If the acceleration due to gravity on Mars is more than that of Earth, then the weight of the object on Mars will be

Discussion

6586.	a block of mass m is pulled along a horizontal surface by a horizontal rope of mass 1kg . a force of 15N is applied at the the free end of the rope . The force exerted by the block on the rope is 13.5 N . The mass m of the block is
Answer» a block of mass m is pulled along a horizontal surface by a horizontal rope of mass 1kg . a force of 15N is applied at the the free end of the rope . The force exerted by the block on the rope is 13.5 N . The mass m of the block is

Discussion

6587.

Read the second stanza again, in which Wordsworth compares the solitary reaper's song with the song of the nightingale and the cuckoo. On the basis of your reading (and your imagination), copy and complete the table below. (Work in groups of four, then have a brief class discussion.) Place Heard by Impact on listener Solitary Reaper Scottish Highlands The poet Holds him spellbound Nightingale Cuckoo

Answer»

Read
the second stanza again, in which Wordsworth compares the solitary

reaper's
song with the song of the nightingale and the cuckoo. On the basis of

your
reading (and your imagination), copy and complete the table below.
(Work

in
groups of four, then have a brief class discussion.)

	Place	Heard by	Impact on listener
Solitary Reaper	Scottish Highlands	The poet	Holds him spellbound
Nightingale
Cuckoo

Discussion

6588.	What is the difference between mass, volume and weight?
Answer» What is the difference between mass, volume and weight?

Discussion

6589.	Area under a velocity-time graph gives
Answer» Area under a velocity-time graph gives

Discussion

6590.	At what height from the earth will the value of acceleration due to gravity be 64%of the value at the surface?(radius of the earth =6400 km )
Answer» At what height from the earth will the value of acceleration due to gravity be 64%of the value at the surface?(radius of the earth =6400 km )

Discussion

6591.	A baseball is popped straight up into the air and has a hanging -time of 6 second .Determine the maximum height to which the ball rises?
Answer» A baseball is popped straight up into the air and has a hanging -time of 6 second .Determine the maximum height to which the ball rises?

Discussion

6592.	Differentiate between nuclear fission and nuclear fusion reaction. ? [4 MARKS]
Answer» Differentiate between nuclear fission and nuclear fusion reaction. ? [4 MARKS]

Discussion

6593.	A coil in the heater consumes the power P. If it is cut into halves and joined in parallel, what power will it consume?
Answer» A coil in the heater consumes the power $P$ . If it is cut into halves and joined in parallel, what power will it consume?

Discussion

6594.	28.A flywheel of mass 50 kg and radius of gyration about its axis of rotation of 0.5m is acted upon by a constant torque of 12.5Nm . It's angular velocity at t=5sec is
Answer» 28.A flywheel of mass 50 kg and radius of gyration about its axis of rotation of 0.5m is acted upon by a constant torque of 12.5Nm . It's angular velocity at t=5sec is

Discussion

6595.	The velocity-time graph of a train traveling between two stations is plotted below:Find the train's acceleration (in m s−2) in each of the time intervals OX, XY, and YZ respectively.
Answer» The velocity-time graph of a train traveling between two stations is plotted below: Find the train's acceleration (in $m s^{- 2}$ ) in each of the time intervals OX, XY, and YZ respectively.

Discussion

6596.	Give two examples to illustrate that a body can have two or more types of motion simultaneously.
Answer» Give two examples to illustrate that a body can have two or more types of motion simultaneously.

Discussion

6597.	How does a musician playing on a flute change the pitch of sound produced by it?
Answer» How does a musician playing on a flute change the pitch of sound produced by it?

Discussion

6598.	A car of 50 kg attains the speed of 10 ms−1in 5 seconds from rest. Calculate the force applied by the engine of the car? (in N)
Answer» A car of 50 kg attains the speed of 10 $m s^{- 1}$ in 5 seconds from rest. Calculate the force applied by the engine of the car? (in N)

Discussion

6599.	A man X to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
Answer» A man X to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?

Discussion

6600.	Tw9 planoconcave lenses of glass of refractive index 1.5 have radii of curvature of 20cm and 30cm.They are placed in contact with curved surfaces towards each other and space between them is filled with liquid(u=4/3).focal length of the system is
Answer» Tw9 planoconcave lenses of glass of refractive index 1.5 have radii of curvature of 20cm and 30cm.They are placed in contact with curved surfaces towards each other and space between them is filled with liquid(u=4/3).focal length of the system is

Discussion

Explore topic-wise InterviewSolutions in .

a car is negotiating a circular turn with banking angle theta .if keeping the banking angle same if speed is increased by 1%.what should be percentage change in radius so that car can negotiate turns safely.

A light wave has a frequency of 4×1014 Hz and a wavelength of 5×10−7 m in a medium. The refractive index of the medium is

A spring executes shm with mass 10kg attached to it. The force Constant of spring is 10N/m .if at any instant its velocity is 40cm/sec,the displacement will be(amplitude is 0.5m)

The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ? (a) 340 (b) 5170 (c) 1280 (d) 1530

Why a frog cant eat a scorpion?

What is a free fall

Two bodies of masses 2kg & 6kg are separated by a certain distance. If the body of mass 6kg is moved 2m towards right, then by how much distance the body of 2kg mass must be moved so that the centre of mass of the final system remains same as that of the initial system?

State two applications of universal law of gravitation. What happens to the gravitational force between two objects when the distance between them is:(i) Doubled?​(ii) Halved?

28. A ball of mass m hits a floor with a speed vmaking an angle a with the normal N. Thecoefficient of restitution is e. The angle made byreflected ball with floor isN(2) tan (ecot o)(1) cot 1(ecot a)

Relative density of substance is

Question 22The earth is acted upon by gravitation of Sun, even though it does not fall into the Sun. Why?

What is free fall?

An enemy plane is at a distance of 300 km from a radar. In how much time will the radar be able to detect the plane? Take velocity of radio waves as 3×108 m/s

32. A particle oscillates along the x-axis according to equationx=0.05sin(5t-/6)where x is in metre and t is in second .find its velocity at t=0 second

An aluminium ball is fully immersed in distilled water, well water, sea water and inland lake water, one by one. The aluminium ball will appear to suffer the maximum loss in weight when immersed in :(1) distilled water(2) sea water(3) well water(4) lake water

A ball is whirled on the end of a string in a horizontal circle of radius R at constant speed v. The centripetal acceleration of the ball can be increased by a factor of 4 by:

A car travels a distance of 200 km from Delhi to Ambala towards north in 5 hours.Calculate velocity of the car for this journey.

Light travels through a glass plate of thickness t and having a refractive index μ. If c is the velocity of light in vacuum, the time taken by light to travel this thickness of glass is

Which of these will be a leap year?

Why the space rockets are generally launched from west to east?

Explain the terms crest and trough in relation to a transverse wave.

A balll thrown vertically upwards with a speed 'u' from the top of a tower reaches the ground in 9 seconds . Another ball thrown vertically downwards from the same position with the same speed 'u' ,takes 4 seconds to reach ground.Calculate the value of 'u'.(Take g = 10m/s^2)

What is the angle between the Direction of E axial and E equatorial

Resistors R1=10Ω, R2 = 40Ω, R3 = 30Ω, R4 = 20Ω, R5 = 60Ω and a 12V battery is connected as shown.Calculate:(a) the total resistance(b) the total current flowing in the circuit. [3 MARKS]

what is the difference between the heat generated and power dissipated in a resistor What are thier formulas

What is meaning of having energy

Name the S.I unit of heat .How is it related to unit calorie?

The coordinates of a moving particle at any time 't' are given byx= ∝t3 and y=βt3.The speed of the particle at time 't' is

Write answers to the following questions in your own words.(a) Why is the weight of the same object different on different planets?(b) What precautions will you take to make accurate measurements in day-to-day affairs?(c) What is the difference between mass and weight?

The mass of a coin in air is 100 g. When it is completely immersed in water, its weight reduces by 0.061 N. The mass of water displaced by the coin is (Take g =9.8 ms−2)

A BODY TRAVELS 10 METRE IN FIRST THREE SECONDS AND 15 METRE IN THE NEXT FOUR SECONDS. WHAT IS THE VELOCITY AT THE END OF EIGHTH SECOND ?

Why does a freely falling object has non-uniform motion. [1 MARK]

If the acceleration due to gravity on Mars is more than that of Earth, then the weight of the object on Mars will be

a block of mass m is pulled along a horizontal surface by a horizontal rope of mass 1kg . a force of 15N is applied at the the free end of the rope . The force exerted by the block on the rope is 13.5 N . The mass m of the block is

What is the difference between mass, volume and weight?

Area under a velocity-time graph gives

At what height from the earth will the value of acceleration due to gravity be 64%of the value at the surface?(radius of the earth =6400 km )

A baseball is popped straight up into the air and has a hanging -time of 6 second .Determine the maximum height to which the ball rises?

Differentiate between nuclear fission and nuclear fusion reaction. ? [4 MARKS]

A coil in the heater consumes the power P. ​If it is cut into halves and joined in parallel, ​what power will it consume?​

28.A flywheel of mass 50 kg and radius of gyration about its axis of rotation of 0.5m is acted upon by a constant torque of 12.5Nm . It's angular velocity at t=5sec is

The velocity-time graph of a train traveling between two stations is plotted below:Find the train's acceleration (in m s−2) in each of the time intervals OX, XY, and YZ respectively.

Give two examples to illustrate that a body can have two or more types of motion simultaneously.

How does a musician playing on a flute change the pitch of sound produced by it?

A car of 50 kg attains the speed of 10 ms−1in 5 seconds from rest. Calculate the force applied by the engine of the car? (in N)

A man X to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?

Tw9 planoconcave lenses of glass of refractive index 1.5 have radii of curvature of 20cm and 30cm.They are placed in contact with curved surfaces towards each other and space between them is filled with liquid(u=4/3).focal length of the system is

State two applications of universal law of gravitation. What happens to the gravitational force between two objects when the distance between them is:(i) Doubled?(ii) Halved?

A coil in the heater consumes the power P. If it is cut into halves and joined in parallel, what power will it consume?