13232 + Interview Questions in Physics Page 77 InterviewSolution

3801.	Calculate the pressure developed by a force of 50 N acting on an area of 10m2.
Answer» Calculate the pressure developed by a force of 50 N acting on an area of ${10 m}^{2}$ .

Discussion

3802.	Does the acceleration produced in a freely falling body depend on the mass of the body ?
Answer» Does the acceleration produced in a freely falling body depend on the mass of the body ?

Discussion

3803.	Words with the sound ‘ch’ as in ‘chart’ and ‘tr’ as in ‘trembles’ in the poem.
Answer» Words with the sound ‘ch’ as in ‘chart’ and ‘tr’ as in ‘trembles’ in the poem.

Discussion

3804.	Consider the following sequential radioactive decayXα→Yβ→Z200100then the atomic number of X is
Answer» Consider the following sequential radioactive decay $X α \to Y β \to Z_{100}^{200}$ then the atomic number of $X$ is

Discussion

3805.	Will a body weigh more in air or in vacuum when weighed with a spring balance ? Give a reason for your answer.
Answer» Will a body weigh more in air or in vacuum when weighed with a spring balance ? Give a reason for your answer.

Discussion

3806.	An object is moving along the circumference of a circular track of radius R. What is the displacement of the object when it covers 3/4th of its circumference?
Answer» An object is moving along the circumference of a circular track of radius R. What is the displacement of the object when it covers 3/4th of its circumference?

Discussion

3807.	The relation between time t and distance x is t = ax^2 +bx where a and b are constant. The acceleration is (a) -2abv^{2 }(b) 2bv^{3 }(c)-2av^{3 }(d) 2av^{
Answer» The relation between time t and distance x is t = ax^2 +bx where a and b are constant. The acceleration is (a) -2abv^{2 }(b) 2bv^{3 }(c)-2av^{3 }(d) 2av^{

Discussion

3808.	The principal stresses at a point inside a solid object are σ1 = 100 MPa, σ2 = 100 MPa and σ3 = 0 MPa. The yield strength of the material is 200 MPa. The factor of safety calculated using Tresca (maximum shear stress) theory is nT and the factor of safety calculated using Von Mises (maximum distortional energy) theory is nv, Which one of the following relations is TRUE?
Answer» The principal stresses at a point inside a solid object are $σ_{1}$ = 100 MPa, $σ_{2}$ = 100 MPa and $σ_{3}$ = 0 MPa. The yield strength of the material is 200 MPa. The factor of safety calculated using Tresca (maximum shear stress) theory is $n_{T}$ and the factor of safety calculated using Von Mises (maximum distortional energy) theory is $n_{v}$ , Which one of the following relations is TRUE?

Discussion

3809.	A stone is thrown vertically upward with a speed of 40 m/s. The time interval for which particle was above 40 m from the ground is(g=10 m/s^2)-(1) 4\sqrt2 s (2)8 s (3)4 s (4)2\sqrt2s
Answer» A stone is thrown vertically upward with a speed of 40 m/s. The time interval for which particle was above 40 m from the ground is(g=10 m/s^2)-(1) 4\sqrt2 s (2)8 s (3)4 s (4)2\sqrt2s

Discussion

3810.	56. Given the data at 25 degree Celsius Ag + I¯ → AgI + eˉ E^° = 0.152 V Ag → Ag+ + e¯ E^° = - 0.800 V What is the value of log Ksp for AgI (2.303RT/F = 0.059V )
Answer» 56. Given the data at 25 degree Celsius Ag + I¯ → AgI + eˉ E^° = 0.152 V Ag → Ag+ + e¯ E^° = - 0.800 V What is the value of log Ksp for AgI (2.303RT/F = 0.059V )

Discussion

3811.	Identify the correct position of the image of the Sun formed by the concave mirror.
Answer» Identify the correct position of the image of the Sun formed by the concave mirror.

Discussion

3812.	A device used to test whether the current is flowing in a conductor or not is :
Answer» A device used to test whether the current is flowing in a conductor or not is :

Discussion

3813.	Which of the following statements does indicate that light waves are transverse?Light waves can travel in vacuumLight waves show interferenceLight waves can be polarizedLight waves can be diffracted
Answer» Which of the following statements does indicate that light waves are transverse? Light waves can travel in vacuum Light waves show interference Light waves can be polarized Light waves can be diffracted

3813.

Which of the following statements does indicate that light waves are transverse?Light waves can travel in vacuumLight waves show interferenceLight waves can be polarizedLight waves can be diffracted

Answer»

Which of the following statements does indicate that light waves are transverse?

Light waves can travel in vacuum
Light waves show interference
Light waves can be polarized
Light waves can be diffracted

Discussion

3814.	A student measured the length of a rod and wrote it as 3.50 cm . Which instrument did he used to measure it? (1) a meter scale with least count 0.1 cm (2) a vernier calliper where the 10 division in vernier scale matches with 9 division in main scale and main scale has 10 division in 1 cm (3) a screw gauge having 100 division in the circular scale and pitch as 1 mm (4) a screw gauge having 50 divisions in the circular scale and pitch as 1 mm Explain.
Answer» A student measured the length of a rod and wrote it as 3.50 cm . Which instrument did he used to measure it? (1) a meter scale with least count 0.1 cm (2) a vernier calliper where the 10 division in vernier scale matches with 9 division in main scale and main scale has 10 division in 1 cm (3) a screw gauge having 100 division in the circular scale and pitch as 1 mm (4) a screw gauge having 50 divisions in the circular scale and pitch as 1 mm Explain.

Discussion

3815.	Question 4A racing car has a uniform acceleration of 4 ms−2. What distance will it cover in 10 seconds after start?
Answer» Question 4 A racing car has a uniform acceleration of $4 m s^{- 2}$ . What distance will it cover in 10 seconds after start?

Discussion

3816.	A stone weighs 5 N in air and 4 N when fullyimmersed in water.what i The magnitude of buoyant force onthe stone is
Answer» A stone weighs 5 N in air and 4 N when fullyimmersed in water.what i The magnitude of buoyant force onthe stone is

Discussion

3817.	Two rods, one of aluminium and the other made of steel, having initial length l1 and l2 are connected together to form a single rod of length l1+l2. The coefficients of linear expansion for aluminium and steel are αa and αa and respectively. If the length of each rod increases by the same amount when their temperature are raised by toC, then find the ratio of length of aluminium rod to the whold rod. (IIT JEE 2003)
Answer» Two rods, one of aluminium and the other made of steel, having initial length $l_{1}$ and $l_{2}$ are connected together to form a single rod of length $l_{1} + l_{2} .$ The coefficients of linear expansion for aluminium and steel are $α_{a}$ and $α_{a}$ and respectively. If the length of each rod increases by the same amount when their temperature are raised by $t^{o} C$ , then find the ratio of length of aluminium rod to the whold rod. (IIT JEE 2003)

Discussion

3818.

Match the following. ‘A’ ‘B’ (a) Carbon, zinc 1. Armature (b) Copper, zinc 2. Insulator (c) Electric motor 3. Dry cell (d) Protection from electric current 4. Simple cell

Answer»

Match the following.

‘A’		‘B’
(a)	Carbon, zinc		1.	Armature
(b)	Copper, zinc		2.	Insulator
(c)	Electric motor		3.	Dry cell
(d)	Protection from electric current		4.	Simple cell

Discussion

3819.	Electromagnetic flux coming from the Sun to the Earth is 10 to power}3 Wm-2. Power superposed on of dimension 8 m 20 m is (A) 2.56 10 to power4}5(. the roo W). (B) 6.4 10 to power 5 (C) 4.0 x 10 to power 5 C() (D).1.6 10 to power 5}neglect brackets p rinted by mistake
Answer» Electromagnetic flux coming from the Sun to the Earth is 10 to power}3 Wm-2. Power superposed on of dimension 8 m 20 m is (A) 2.56 10 to power4}5(. the roo W). (B) 6.4 10 to power 5 (C) 4.0 x 10 to power 5 C() (D).1.6 10 to power 5}neglect brackets p rinted by mistake

Discussion

3820.	How to solve the numericals of force and laws of motion?
Answer» How to solve the numericals of force and laws of motion?

Discussion

3821.	The position of a body moving along x-axis at time t is given by X=(t Square-4t +6)m.The distance travelled by body in time interval t=0 to t=3s is
Answer» The position of a body moving along x-axis at time t is given by X=(t Square-4t +6)m.The distance travelled by body in time interval t=0 to t=3s is

Discussion

3822.	What happens to force between two bodies if 1.The mass of one body is doubled 2.The masses of both the bodies are tripled 3.The distance between two bodies is tripled
Answer» What happens to force between two bodies if 1.The mass of one body is doubled 2.The masses of both the bodies are tripled 3.The distance between two bodies is tripled

3822.

What happens to force between two bodies if 1.The mass of one body is doubled 2.The masses of both the bodies are tripled 3.The distance between two bodies is tripled

Answer»

What happens to force between two bodies if

1.The mass of one body is doubled

2.The masses of both the bodies are tripled

3.The distance between two bodies is tripled

Discussion

3823.	what will be the acceleration time graph of a turning bod
Answer» what will be the acceleration time graph of a turning bod

Discussion

3824.	A.500.0 mmB.50.0 cmC.0.500 mD.5.0*10^-4 kmIt is given that out of these four values A is most accurate as it has maximum significant figures but significant figure only represent precision not accuracy so all should be equally accurate as they are equally close to the same value??
Answer» A.500.0 mm B.50.0 cm C.0.500 m D.5.0*10^-4 km It is given that out of these four values A is most accurate as it has maximum significant figures but significant figure only represent precision not accuracy so all should be equally accurate as they are equally close to the same value??

Discussion

3825.	The magnitude of acceleration of blocks of mass 2 kg and 4 kg are a1 and a2 respectively. The relation between a1 and a2 is
Answer» The magnitude of acceleration of blocks of mass 2 kg and 4 kg are a1 and a2 respectively. The relation between a1 and a2 is

Discussion

3826.	A man X goes 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 goes 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

3827.	A spherical thermocouple junction of diameter 0.706 mm is to be used for the measurement of temperature of a gas stream. The convective heat transfer coefficient on bead surface is 400 W/m2K. Thermophysical properties of thermocouple material are k=20 W/mK, c=400 J/kgK and ρ=8500 kg/m3. If the thermocouple initially at 30∘ C is placed in a hot stream of 300∘ C, the time taken by the bead to reach 298∘ C, is
Answer» A spherical thermocouple junction of diameter $0.706 m m$ is to be used for the measurement of temperature of a gas stream. The convective heat transfer coefficient on bead surface is $400 W / m^{2} K .$ Thermophysical properties of thermocouple material are $k = 20 W / m K, c = 400 J / k g K$ and $ρ = 8500 k g / m^{3} .$ If the thermocouple initially at $30^{\circ} C$ is placed in a hot stream of $300^{\circ} C,$ the time taken by the bead to reach $298^{\circ} C,$ is

Discussion

3828.	ntA body of mass m falls from height h on ground .If e be the coefficient of restitution of collision between the body and ground , then the distance travelled by body before it comes to rest is ?n
Answer» ntA body of mass m falls from height h on ground .If e be the coefficient of restitution of collision between the body and ground , then the distance travelled by body before it comes to rest is ?n

Discussion

3829.	Question 10The atmosphere is held to the earth by(a) gravity(b) wind(c) clouds(d) earth’s magnetic field
Answer» Question 10 The atmosphere is held to the earth by (a) gravity (b) wind (c) clouds (d) earth’s magnetic field

Discussion

3830.	the force between 2 identical particles separated by a dis†an ce d is F .Six such identical partivles are placed at the corners of a regular hexagon of side d . then the magnitude of the net force on any particle will be
Answer» the force between 2 identical particles separated by a dis†an ce d is F .Six such identical partivles are placed at the corners of a regular hexagon of side d . then the magnitude of the net force on any particle will be

Discussion

3831.	A satellite is to revolve round the earth in a circle of radius 8000 km. With what speed should this satellite be projected into orbit? What will be the time period ? Take g at the surface = 9.8 m/s2 and radius of the earth = 6400km.
Answer» A satellite is to revolve round the earth in a circle of radius 8000 km. With what speed should this satellite be projected into orbit? What will be the time period ? Take g at the surface = 9.8 m/ $s^{2}$ and radius of the earth = 6400km.

Discussion

3832.	what is meant by vector laws?
Answer» what is meant by vector laws?

Discussion

3833.	Which of the following factors affect the speed of sound in gas?
Answer» Which of the following factors affect the speed of sound in gas?

Discussion

3834.	The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find : (i) Wavelength of the wave (ii) Frequency of the wave
Answer» The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find : (i) Wavelength of the wave (ii) Frequency of the wave

3834.

The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find : (i) Wavelength of the wave (ii) Frequency of the wave

Answer»

The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find :

(i) Wavelength of the wave

(ii) Frequency of the wave

Discussion

3835.	The mass of block A is three times the mass of block B, while its density is two times that of block B. What is the ratio of the fractions of volume submerged in water of block A and block B?[Consider the densities of block A and block B are less than density of water]
Answer» The mass of block A is three times the mass of block B, while its density is two times that of block B. What is the ratio of the fractions of volume submerged in water of block A and block B? [Consider the densities of block A and block B are less than density of water]

Discussion

3836.	Given that the mass of the earth is M and its radius is R. A body is dropped from a height equal to the radius of the earth above the surface of the earth. Find the speed of the body when it reaches the ground
Answer» Given that the mass of the earth is M and its radius is R. A body is dropped from a height equal to the radius of the earth above the surface of the earth. Find the speed of the body when it reaches the ground

Discussion

3837.	Define law of universal gravitational force
Answer» Define law of universal gravitational force

Discussion

3838.	95.Two particles each of mass m are released from rest from infinite separation. The velocity of any one when their separation becomes r will be?
Answer» 95.Two particles each of mass m are released from rest from infinite separation. The velocity of any one when their separation becomes r will be?

Discussion

3839.	A stone and 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 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

3840.	An ion with mass number 56contain 3 units of positive charge and 30.4%more neutron than elactron. Assign symbol for the ion
Answer» An ion with mass number 56contain 3 units of positive charge and 30.4%more neutron than elactron. Assign symbol for the ion

Discussion

3841.	Name three devices which work on the reflection of sound.
Answer» Name three devices which work on the reflection of sound.

Discussion

3842.	Michael Jordan has a vertical leap of 1.25 m, what is his take-off speed and for how much time he will be in the air? Take a = 10 m/s2 downwards.
Answer» Michael Jordan has a vertical leap of 1.25 m, what is his take-off speed and for how much time he will be in the air? Take a = 10 m/s² downwards.

Discussion

3843.	A concrete beam of span 15 m, 150 mm and 350 mm deep is prestressed with a parabolic cable as shown in the figure (not drawn to the scale). Coefficient of friction for the cable is 0.35, and coefficient of wave effect is 0.0015 per metre.If the cable is tensioned from one end only , the percentage loss (round off to one decimal place) in the cable force due to friction, is_____.4.5
Answer» A concrete beam of span 15 m, 150 mm and 350 mm deep is prestressed with a parabolic cable as shown in the figure (not drawn to the scale). Coefficient of friction for the cable is 0.35, and coefficient of wave effect is 0.0015 per metre. If the cable is tensioned from one end only , the percentage loss (round off to one decimal place) in the cable force due to friction, is_____. 4.5

Discussion

3844.	A stone is thrown in a vertically upward direction with a velocity of 6 ms−1. If the acceleration of the stone during its motion is 12 ms−2 in the downward direction, what will be the height attained by the stone?
Answer» A stone is thrown in a vertically upward direction with a velocity of $6 m s^{- 1}$ . If the acceleration of the stone during its motion is $12 m s^{- 2}$ in the downward direction, what will be the height attained by the stone?

Discussion

3845.	The time period of a pendulum varies with its length. If the length is increased how does the time period change?
Answer» The time period of a pendulum varies with its length. If the length is increased how does the time period change?

Discussion

3846.	a particle is moving in a x-y plane in a circular track of radius of 2 m in constant speed v=3m/s boy taking origin as the centre of circular path. if at a time t=0 the particle is at point A on the x axis then the accln. of particle in m/s^2 at t= Pie sec will be
Answer» a particle is moving in a x-y plane in a circular track of radius of 2 m in constant speed v=3m/s boy taking origin as the centre of circular path. if at a time t=0 the particle is at point A on the x axis then the accln. of particle in m/s^2 at t= Pie sec will be

Discussion

3847.	For a moving particle the relation between dis†an ce(s) and the time (t) is s=a+bt+ct^{2 }+dt^3 which one among a, b ,c, d represent dimension of acceleration
Answer» For a moving particle the relation between dis†an ce(s) and the time (t) is s=a+bt+ct^{2 }+dt^3 which one among a, b ,c, d represent dimension of acceleration

Discussion

3848.	19. The density of a gas is 1.27 gL-1 at 50C and 0.987 x 105 Pa. Calculate its molar mass.
Answer» 19. The density of a gas is 1.27 gL-1 at 50C and 0.987 x 105 Pa. Calculate its molar mass.

Discussion

3849.	Name the quantity which is measured by the area occupied under the velocity-time graph.
Answer» Name the quantity which is measured by the area occupied under the velocity-time graph.

Discussion

3850.	24 pipes, all of them of the same size can fill a tank in 112 mins. If 10 pipes are closed, then how much time will it take to fill the tank?
Answer» 24 pipes, all of them of the same size can fill a tank in 112 mins. If 10 pipes are closed, then how much time will it take to fill the tank?

Discussion

Explore topic-wise InterviewSolutions in .

Calculate the pressure developed by a force of 50 N acting on an area of 10m2.

Does the acceleration produced in a freely falling body depend on the mass of the body ?

Words with the sound ‘ch’ as in ‘chart’ and ‘tr’ as in ‘trembles’ in the poem.

Consider the following sequential radioactive decayXα→Yβ→Z200100then the atomic number of X is

Will a body weigh more in air or in vacuum when weighed with a spring balance ? Give a reason for your answer.

An object is moving along the circumference of a circular track of radius R. What is the displacement of the object when it covers 3/4th of its circumference?

The relation between time t and distance x is t = ax^2 +bx where a and b are constant. The acceleration is (a) -2abv^{2 }(b) 2bv^{3 }(c)-2av^{3 }(d) 2av^{

A stone is thrown vertically upward with a speed of 40 m/s. The time interval for which particle was above 40 m from the ground is(g=10 m/s^2)-(1) 4\sqrt2 s (2)8 s (3)4 s (4)2\sqrt2s

56. Given the data at 25 degree Celsius Ag + I¯ → AgI + eˉ E^° = 0.152 V Ag → Ag+ + e¯ E^° = - 0.800 V What is the value of log Ksp for AgI (2.303RT/F = 0.059V )

Identify the correct position of the image of the Sun formed by the concave mirror.

A device used to test whether the current is flowing in a conductor or not is :

Which of the following statements does indicate that light waves are transverse?Light waves can travel in vacuumLight waves show interferenceLight waves can be polarizedLight waves can be diffracted

Question 4A racing car has a uniform acceleration of 4 ms−2. What distance will it cover in 10 seconds after start?

A stone weighs 5 N in air and 4 N when fullyimmersed in water.what i The magnitude of buoyant force onthe stone is

Match the following. ‘A’ ‘B’ (a) Carbon, zinc 1. Armature (b) Copper, zinc 2. Insulator (c) Electric motor 3. Dry cell (d) Protection from electric current 4. Simple cell

Electromagnetic flux coming from the Sun to the Earth is 10 to power}3 Wm-2. Power superposed on of dimension 8 m 20 m is (A) 2.56 10 to power4}5(. the roo W). (B) 6.4 10 to power 5 (C) 4.0 x 10 to power 5 C() (D).1.6 10 to power 5}neglect brackets p rinted by mistake

How to solve the numericals of force and laws of motion?

The position of a body moving along x-axis at time t is given by X=(t Square-4t +6)m.The distance travelled by body in time interval t=0 to t=3s is

What happens to force between two bodies if 1.The mass of one body is doubled 2.The masses of both the bodies are tripled 3.The distance between two bodies is tripled

what will be the acceleration time graph of a turning bod

A.500.0 mmB.50.0 cmC.0.500 mD.5.0*10^-4 kmIt is given that out of these four values A is most accurate as it has maximum significant figures but significant figure only represent precision not accuracy so all should be equally accurate as they are equally close to the same value??

The magnitude of acceleration of blocks of mass 2 kg and 4 kg are a1 and a2 respectively. The relation between a1 and a2 is

A man X goes 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 ?

ntA body of mass m falls from height h on ground .If e be the coefficient of restitution of collision between the body and ground , then the distance travelled by body before it comes to rest is ?n

Question 10The atmosphere is held to the earth by(a) gravity(b) wind(c) clouds(d) earth’s magnetic field

the force between 2 identical particles separated by a dis†an ce d is F .Six such identical partivles are placed at the corners of a regular hexagon of side d . then the magnitude of the net force on any particle will be

A satellite is to revolve round the earth in a circle of radius 8000 km. With what speed should this satellite be projected into orbit? What will be the time period ? Take g at the surface = 9.8 m/s2 and radius of the earth = 6400km.

what is meant by vector laws?

Which of the following factors affect the speed of sound in gas?

The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find : (i) Wavelength of the wave (ii) Frequency of the wave

The mass of block A is three times the mass of block B, while its density is two times that of block B. What is the ratio of the fractions of volume submerged in water of block A and block B?[Consider the densities of block A and block B are less than density of water]

Given that the mass of the earth is M and its radius is R. A body is dropped from a height equal to the radius of the earth above the surface of the earth. Find the speed of the body when it reaches the ground

Define law of universal gravitational force

95.Two particles each of mass m are released from rest from infinite separation. The velocity of any one when their separation becomes r will be?

A stone and 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?

An ion with mass number 56contain 3 units of positive charge and 30.4%more neutron than elactron. Assign symbol for the ion

Name three devices which work on the reflection of sound.

Michael Jordan has a vertical leap of 1.25 m, what is his take-off speed and for how much time he will be in the air? Take a = 10 m/s2 downwards.

A stone is thrown in a vertically upward direction with a velocity of 6 ms−1. If the acceleration of the stone during its motion is 12 ms−2 in the downward direction, what will be the height attained by the stone?

The time period of a pendulum varies with its length. If the length is increased how does the time period change?

a particle is moving in a x-y plane in a circular track of radius of 2 m in constant speed v=3m/s boy taking origin as the centre of circular path. if at a time t=0 the particle is at point A on the x axis then the accln. of particle in m/s^2 at t= Pie sec will be

For a moving particle the relation between dis†an ce(s) and the time (t) is s=a+bt+ct^{2 }+dt^3 which one among a, b ,c, d represent dimension of acceleration

19. The density of a gas is 1.27 gL-1 at 50C and 0.987 x 105 Pa. Calculate its molar mass.

Name the quantity which is measured by the area occupied under the velocity-time graph.

24 pipes, all of them of the same size can fill a tank in 112 mins. If 10 pipes are closed, then how much time will it take to fill the tank?