13232 + Interview Questions in Physics Page 131 InterviewSolution

6501.	Taking into account of the significant figures, what is the value of 23.623 cm+8.7 cm ?
Answer» Taking into account of the significant figures, what is the value of $23.623 cm + 8.7 cm$ ?

Discussion

6502.	What is spectroscopy
Answer» What is spectroscopy

Discussion

6503.	If velocity v as a function of time t is given as v = 3t^2 then position x is proportional to a) t b) t^2 c) t^3 d) t^4
Answer» If velocity v as a function of time t is given as v = 3t^2 then position x is proportional to a) t b) t^2 c) t^3 d) t^4

Discussion

6504.	If the air on Earth's surface is replaced with water, then to what extent the water level must rise so as to maintain the same pressure on Earth's surface? [Assume nothing above water surface. given g = 10 m/s2, density of water = 1000 kg/m3.
Answer» If the air on Earth's surface is replaced with water, then to what extent the water level must rise so as to maintain the same pressure on Earth's surface? [Assume nothing above water surface. given g = 10 m/s², density of water = 1000 kg/m³.

Discussion

6505.	what is magnituide and vector laws
Answer» what is magnituide and vector laws

Discussion

6506.	The amount of work done depends on
Answer» The amount of work done depends on

Discussion

6507.	3.A uniform sector of mass 1 kg and radius π m is suspended as shown in figure. It executes small oscillations about an axis passing through the point of suspension and perpendicular to the plane of the sector. Fimd it's time period of oscillations. g=π²
Answer» 3.A uniform sector of mass 1 kg and radius π m is suspended as shown in figure. It executes small oscillations about an axis passing through the point of suspension and perpendicular to the plane of the sector. Fimd it's time period of oscillations. g=π²

Discussion

6508.	A partical is ecxicuting simple harmonic motion on a line 4cms long. If it's velocity at mean position is 12cm/sec its frequency in hertz will be?
Answer» A partical is ecxicuting simple harmonic motion on a line 4cms long. If it's velocity at mean position is 12cm/sec its frequency in hertz will be?

Discussion

6509.	Define uniform and non-uniform motion.
Answer» Define uniform and non-uniform motion.

Discussion

6510.	A boy is sitting on a merry-go-round which is moving with a constant speed. This means that the boy is
Answer» A boy is sitting on a merry-go-round which is moving with a constant speed. This means that the boy is

Discussion

6511.	graphical representation of derivation of average velocity (v+u)/2the fourth derivation of motion
Answer» graphical representation of derivation of average velocity (v+u)/2 the fourth derivation of motion

Discussion

6512.	An object of 5.0 cm height is placed at a distance of 20 cm in front of a concave mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.
Answer» An object of 5.0 cm height is placed at a distance of 20 cm in front of a concave mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.

Discussion

6513.	What causes winds and cyclones?
Answer» What causes winds and cyclones?

Discussion

6514.	The product of the mass and rate of change of velocity is called
Answer» The product of the mass and rate of change of velocity is called

Discussion

6515.	A sealed cane of mass 600g has a volume of 500cm(cube) Will this Cane sink in water
Answer» A sealed cane of mass 600g has a volume of 500cm(cube) Will this Cane sink in water

Discussion

6516.	How do we determine the timbre of sound?
Answer» How do we determine the timbre of sound?

Discussion

6517.	A particle move in straight line with initial velocity 2 meter per second having cons†an t retardation of magnitude 1 meter per second square. Find the average speed in 0 to 3 second
Answer» A particle move in straight line with initial velocity 2 meter per second having cons†an t retardation of magnitude 1 meter per second square. Find the average speed in 0 to 3 second

Discussion

6518.	How to derive expression for moment of inertia of a body?
Answer» How to derive expression for moment of inertia of a body?

Discussion

6519.	Who proposed the idea that charged particles have electrical influence in space around them?
Answer» Who proposed the idea that charged particles have electrical influence in space around them?

Discussion

6520.	Which of the following graphs represent the body in uniform motion throughout the journey?
Answer» Which of the following graphs represent the body in uniform motion throughout the journey?

Discussion

6521.	In case of accelerated motion along a straight line, the distance travelled by the body is :
Answer» In case of accelerated motion along a straight line, the distance travelled by the body is :

Discussion

6522.	What is the weight in Newton exerted by 10 kg mass on a horizontal stationary surface if the acceleration due to gravity at the place is 10 ms−2? How many Newton of force will it exert on a point of support which is undergoing a downward acceleration of 5 ms−2? [2 MARKS]
Answer» What is the weight in Newton exerted by 10 kg mass on a horizontal stationary surface if the acceleration due to gravity at the place is $10 m s^{- 2}$ ? How many Newton of force will it exert on a point of support which is undergoing a downward acceleration of $5 m s^{- 2}$ ? [2 MARKS]

Discussion

6523.	The reading of a spring balance when a block is suspended from it in the air is 60 N. The reading is changed to 40 N when the block is submerged in water. Find the relative density of the block.
Answer» The reading of a spring balance when a block is suspended from it in the air is 60 N. The reading is changed to 40 N when the block is submerged in water. Find the relative density of the block.

Discussion

6524.	Change in velocity of a particle moving along circular path with a constant speed at the diametrically opposite ends
Answer» Change in velocity of a particle moving along circular path with a constant speed at the diametrically opposite ends

Discussion

6525.	Average velocity and Average speed is same for:
Answer» Average velocity and Average speed is same for:

Discussion

6526.	A man start from rest moves with acceleration 2m/s for 3 second then moves with constant velocity for 2 second for next 4 second partical to moves with acceleration 4m/s then returned to rest to in 10 second .find returned and totel displacement also find average velocity for first 6 second? With figure?
Answer» A man start from rest moves with acceleration 2m/s for 3 second then moves with constant velocity for 2 second for next 4 second partical to moves with acceleration 4m/s then returned to rest to in 10 second .find returned and totel displacement also find average velocity for first 6 second? With figure?

Discussion

6527.	A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency
Answer» A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency

Discussion

6528.	A rifle bullet of mass 5 g shot into a still target with a velocity of 150 m s−1, comes to rest in the target after penetrating about 30 cm. What is the resistive force (in N) offered by the target to the bullet?-187.5
Answer» A rifle bullet of mass $5 g$ shot into a still target with a velocity of $150 {m s}^{- 1}$ , comes to rest in the target after penetrating about $30 cm$ . What is the resistive force (in $N$ ) offered by the target to the bullet? -187.5

Discussion

6529.	Which of the following fuel is formed under the earth's surface by decomposition?
Answer» Which of the following fuel is formed under the earth's surface by decomposition?

Discussion

6530.	Why is the outer space black in colour though it has numerous stars and other huge light sources in it???
Answer» Why is the outer space black in colour though it has numerous stars and other huge light sources in it???

Discussion

6531.	A RESISTANCE OF 9 OHM IS CONNECTED TO TERMINALS OF A CELL A VOLTMETER ACROSS CELL READS 1.8 V WHEN A RESISTANCE OF 10 OHM IS CONNECTED IN SERIES WITH 9 OHM THE VOLTMETER CHANGES TO 1.9 V CALCULATE EMF AND INTERNAL RESISTANCE OF A CELL
Answer» A RESISTANCE OF 9 OHM IS CONNECTED TO TERMINALS OF A CELL A VOLTMETER ACROSS CELL READS 1.8 V WHEN A RESISTANCE OF 10 OHM IS CONNECTED IN SERIES WITH 9 OHM THE VOLTMETER CHANGES TO 1.9 V CALCULATE EMF AND INTERNAL RESISTANCE OF A CELL

Discussion

6532.	In an experiment, time can be calculated correct to one second and length correct to one millimetre. Which amongst the following speed is most accurate and why?
Answer» In an experiment, time can be calculated correct to one second and length correct to one millimetre. Which amongst the following speed is most accurate and why?

Discussion

6533.	at planet has twice the mass of earth and identical size .what will be the height above the surface of the planet where its accelaration due to gravity reduces by 36 % of its value on its surface
Answer» at planet has twice the mass of earth and identical size .what will be the height above the surface of the planet where its accelaration due to gravity reduces by 36 % of its value on its surface

Discussion

6534.	A bullet of mass 20 g travelling horizontally with a velocity of 100 ms−1 strikes a wooden block and comes to rest in 0.05 s. Calculate the magnitude of force in N exerted by the wooden block on the bullet.
Answer» A bullet of mass 20 g travelling horizontally with a velocity of 100 m $s^{- 1}$ strikes a wooden block and comes to rest in 0.05 s. Calculate the magnitude of force in N exerted by the wooden block on the bullet.

Discussion

6535.	Calculate the pressure at a depth of 50 m below the surface of the sea. The density of sea water ρ is 1024 kg m−3.
Answer» Calculate the pressure at a depth of $50 m$ below the surface of the sea. The density of sea water $ρ$ is $1024$ $k g m^{- 3}$ .

Discussion

6536.	Refraction of a light ray at air-glass interface is as shown. If the refractive index of the glass is 1.5, calculate the speed of light of the refracted ray.
Answer» Refraction of a light ray at air-glass interface is as shown. If the refractive index of the glass is 1.5, calculate the speed of light of the refracted ray.

Discussion

6537.	When a body moves with a cons†an t speed along a circle (1) No work is done on it (2) No acceleration is produced in it ( 3) Its velocity remains cons†an t (4) No force acts on it
Answer» When a body moves with a cons†an t speed along a circle (1) No work is done on it (2) No acceleration is produced in it ( 3) Its velocity remains cons†an t (4) No force acts on it

Discussion

6538.	18. What is the speed at the highest point of path of projectile?
Answer» 18. What is the speed at the highest point of path of projectile?

Discussion

6539.	Two masses M and 4M are separated by a distance d. What will be the distance of mass 1 kg from M and 4M respectively, so that net gravitational force on it is zero?
Answer» Two masses M and 4M are separated by a distance d. What will be the distance of mass 1 kg from M and 4M respectively, so that net gravitational force on it is zero?

Discussion

6540.	Sometimes we use 9.8 m/s2 for the value of acceleration due to gravity and sometimes we use 10 m/s2 for the value of acceleration due to gravity. What is the reason behind this?
Answer» Sometimes we use 9.8 $m / s^{2}$ for the value of acceleration due to gravity and sometimes we use 10 $m / s^{2}$ for the value of acceleration due to gravity. What is the reason behind this?

Discussion

6541.	what ia combution and what is the fundamental particle of flame of fir
Answer» what ia combution and what is the fundamental particle of flame of fir

Discussion

6542.	A small spherical object having density 2P is placed inside the liquid of density P and connected to an ideal string of length l whose other end is kept fixed so that the object can move in a vertical cirlcle, minimum speed which must be given at the bottom to just complete the vertical circle.
Answer» A small spherical object having density 2P is placed inside the liquid of density P and connected to an ideal string of length l whose other end is kept fixed so that the object can move in a vertical cirlcle, minimum speed which must be given at the bottom to just complete the vertical circle.

Discussion

6543.	It is easy to push an empty box than a same box full of books, because _____.
Answer» It is easy to push an empty box than a same box full of books, because _____.

Discussion

6544.	What will be the weight of a mass placed at the exact centre of the earth i.e dis†an ce of the mass from the centre of the earth is zero
Answer» What will be the weight of a mass placed at the exact centre of the earth i.e dis†an ce of the mass from the centre of the earth is zero

Discussion

6545.	Ifis the magnetic latitude at a place, then what is the relation between the angle of dip andmagnetic latitude?
Answer» Ifis the magnetic latitude at a place, then what is the relation between the angle of dip andmagnetic latitude?

Discussion

6546.	How can we determine the weather condition with decrease or increase in level of mercury of simple barometer
Answer» How can we determine the weather condition with decrease or increase in level of mercury of simple barometer

Discussion

6547.	100 sugar cubes of sidelength 0.1 cm are put into a glass of milk. Find the force of buoyancy experienced by each sugar cube before they dissolve, in CGS units. (RD of milk ≈1.02)
Answer» $100$ sugar cubes of sidelength $0.1 cm$ are put into a glass of milk. Find the force of buoyancy experienced by each sugar cube before they dissolve, in CGS units. $($ RD of milk $\approx 1.02)$

Discussion

6548.	it was a raining day . Rohit was sitting besides the window when he saw a lightning . He started his stop watch . He found that after 22 seconds of lightning it's roaring sound was heard . Calculate the height of the clouds which caused this lightning. Given ,speed of light=3×108m/s and speed of sound =340m/s
Answer» it was a raining day . Rohit was sitting besides the window when he saw a lightning . He started his stop watch . He found that after 22 seconds of lightning it's roaring sound was heard . Calculate the height of the clouds which caused this lightning. Given ,speed of light=3×10^8m/s and speed of sound =340m/s

Discussion

6549.	a stone is projected with velocity 20 root 2 at an angle of 45 degrees to the horizontal.the average velocity of stone during its motion from starting point to max height take( g=10)
Answer» a stone is projected with velocity 20 root 2 at an angle of 45 degrees to the horizontal.the average velocity of stone during its motion from starting point to max height take( g=10)

Discussion

6550.	Earth has negative surface charge density then why it's potential is zero .why objects neutralises when connected to earth.
Answer» Earth has negative surface charge density then why it's potential is zero .why objects neutralises when connected to earth.

Discussion

Explore topic-wise InterviewSolutions in .

Taking into account of the significant figures, what is the value of 23.623 cm+8.7 cm ?

What is spectroscopy

If velocity v as a function of time t is given as v = 3t^2 then position x is proportional to a) t b) t^2 c) t^3 d) t^4

If the air on Earth's surface is replaced with water, then to what extent the water level must rise so as to maintain the same pressure on Earth's surface? [Assume nothing above water surface. given g = 10 m/s2, density of water = 1000 kg/m3.

what is magnituide and vector laws

The amount of work done depends on

3.A uniform sector of mass 1 kg and radius π m is suspended as shown in figure. It executes small oscillations about an axis passing through the point of suspension and perpendicular to the plane of the sector. Fimd it's time period of oscillations. g=π²

A partical is ecxicuting simple harmonic motion on a line 4cms long. If it's velocity at mean position is 12cm/sec its frequency in hertz will be?

Define uniform and non-uniform motion.

A boy is sitting on a merry-go-round which is moving with a constant speed. This means that the boy is

graphical representation of derivation of average velocity (v+u)/2the fourth derivation of motion

An object of 5.0 cm height is placed at a distance of 20 cm in front of a concave mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.

What causes winds and cyclones?

The product of the mass and rate of change of velocity is called

A sealed cane of mass 600g has a volume of 500cm(cube) Will this Cane sink in water

How do we determine the timbre of sound?

A particle move in straight line with initial velocity 2 meter per second having cons†an t retardation of magnitude 1 meter per second square. Find the average speed in 0 to 3 second

How to derive expression for moment of inertia of a body?

Who proposed the idea that charged particles have electrical influence in space around them?

Which of the following graphs represent the body in uniform motion throughout the journey?

In case of accelerated motion along a straight line, the distance travelled by the body is :

What is the weight in Newton exerted by 10 kg mass on a horizontal stationary surface if the acceleration due to gravity at the place is 10 ms−2? How many Newton of force will it exert on a point of support which is undergoing a downward acceleration of 5 ms−2? [2 MARKS]

The reading of a spring balance when a block is suspended from it in the air is 60 N. The reading is changed to 40 N when the block is submerged in water. Find the relative density of the block.

Change in velocity of a particle moving along circular path with a constant speed at the diametrically opposite ends

Average velocity and Average speed is same for:

A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency

A rifle bullet of mass 5 g shot into a still target with a velocity of 150 m s−1, comes to rest in the target after penetrating about 30 cm. What is the resistive force (in N) offered by the target to the bullet?-187.5

Which of the following fuel is formed under the earth's surface by decomposition?

Why is the outer space black in colour though it has numerous stars and other huge light sources in it???

A RESISTANCE OF 9 OHM IS CONNECTED TO TERMINALS OF A CELL A VOLTMETER ACROSS CELL READS 1.8 V WHEN A RESISTANCE OF 10 OHM IS CONNECTED IN SERIES WITH 9 OHM THE VOLTMETER CHANGES TO 1.9 V CALCULATE EMF AND INTERNAL RESISTANCE OF A CELL

In an experiment, time can be calculated correct to one second and length correct to one millimetre. Which amongst the following speed is most accurate and why?

at planet has twice the mass of earth and identical size .what will be the height above the surface of the planet where its accelaration due to gravity reduces by 36 % of its value on its surface

A bullet of mass 20 g travelling horizontally with a velocity of 100 ms−1 strikes a wooden block and comes to rest in 0.05 s. Calculate the magnitude of force in N exerted by the wooden block on the bullet.

Calculate the pressure at a depth of 50 m below the surface of the sea. The density of sea water ρ is 1024 kg m−3.

Refraction of a light ray at air-glass interface is as shown. If the refractive index of the glass is 1.5, calculate the speed of light of the refracted ray.

When a body moves with a cons†an t speed along a circle (1) No work is done on it (2) No acceleration is produced in it ( 3) Its velocity remains cons†an t (4) No force acts on it

18. What is the speed at the highest point of path of projectile?

Two masses M and 4M are separated by a distance d. What will be the distance of mass 1 kg from M and 4M respectively, so that net gravitational force on it is zero?

Sometimes we use 9.8 m/s2 for the value of acceleration due to gravity and sometimes we use 10 m/s2 for the value of acceleration due to gravity. What is the reason behind this?

what ia combution and what is the fundamental particle of flame of fir

A small spherical object having density 2P is placed inside the liquid of density P and connected to an ideal string of length l whose other end is kept fixed so that the object can move in a vertical cirlcle, minimum speed which must be given at the bottom to just complete the vertical circle.

It is easy to push an empty box than a same box full of books, because _____.

What will be the weight of a mass placed at the exact centre of the earth i.e dis†an ce of the mass from the centre of the earth is zero

Ifis the magnetic latitude at a place, then what is the relation between the angle of dip andmagnetic latitude?

How can we determine the weather condition with decrease or increase in level of mercury of simple barometer

100 sugar cubes of sidelength 0.1 cm are put into a glass of milk. Find the force of buoyancy experienced by each sugar cube before they dissolve, in CGS units. (RD of milk ≈1.02)

a stone is projected with velocity 20 root 2 at an angle of 45 degrees to the horizontal.the average velocity of stone during its motion from starting point to max height take( g=10)

Earth has negative surface charge density then why it's potential is zero .why objects neutralises when connected to earth.