9478 + Interview Questions in Physics Page 45 InterviewSolution

2201.	A body starting from rest is moving under a constant acceleration up to 20 sec. If it moves S1 distance infirst 10 sec., and S2 distance in next 10 sec. then S2 will be equal to: (1) S1 (2) 2S1 (3) 3S1 (4) 4S
Answer» A body starting from rest is moving under a constant acceleration up to 20 sec. If it moves S1 distance infirst 10 sec., and S2 distance in next 10 sec. then S2 will be equal to: (1) S1 (2) 2S1 (3) 3S1 (4) 4S

Discussion

2202.	A body of dimensions 2m×3m×4m is acted upon by a force of 50 N on the top surface (2m×3m). The pressure due to the force on that surface is
Answer» A body of dimensions $2 m \times 3 m \times 4 m$ is acted upon by a force of $50 N$ on the top surface $(2 m \times 3 m)$ . The pressure due to the force on that surface is

Discussion

2203.	When a horizontal force P acts on a cart of mass 20KG , it moves with a uniform velocity on a horizontal floor. When a force of 1.2P acts on the cart , it moves with an acceleration of 0.05m/s² .Find the valve of P?
Answer» When a horizontal force P acts on a cart of mass 20KG , it moves with a uniform velocity on a horizontal floor. When a force of 1.2P acts on the cart , it moves with an acceleration of 0.05m/s² .Find the valve of P?

Discussion

2204.	Electric field in a region is given by 20i + 10j . What will be the electric flux through a square surface of side 10 cm and placed perpendicular to x-axis?
Answer» Electric field in a region is given by 20i + 10j . What will be the electric flux through a square surface of side 10 cm and placed perpendicular to x-axis?

Discussion

2205.	What will happen if there is no key in a circuit?
Answer» What will happen if there is no key in a circuit?

Discussion

2206.	Why is O2 is more compressible than h2?
Answer» Why is O2 is more compressible than h2?

Discussion

2207.	What is the difference between voltage, potential difference and electromotive force?
Answer» What is the difference between voltage, potential difference and electromotive force?

Discussion

2208.	What is the order of discharge of ions?
Answer» What is the order of discharge of ions?

Discussion

2209.	An ebonite rod is rubbed with fur. Explain the charging of the ebonite rod and the fur on the basis of electron movement.
Answer» An ebonite rod is rubbed with fur. Explain the charging of the ebonite rod and the fur on the basis of electron movement.

Discussion

2210.	In the figure shown, the velocity and pressure of the liquid at the cross-section (2) are given by(P0 is the atmospheric pressure)(ρ is the density of the liquid)
Answer» In the figure shown, the velocity and pressure of the liquid at the cross-section $(2)$ are given by $(P_{0}$ is the atmospheric pressure $)$ $(ρ$ is the density of the liquid $)$

Discussion

2211.	A set up consisting of a bulb, salt solution and a magnetic compass is arranged in such a manner that bulb and salt solution come in between the electric wires connected to the cell and hence complete the circuit. The magnetic compass is wrapped with the connecting wires. When switched on, current flows through the salt solution, the bulb glows and the needle deflects. Which of the following effects of current is responsible for this?
Answer» A set up consisting of a bulb, salt solution and a magnetic compass is arranged in such a manner that bulb and salt solution come in between the electric wires connected to the cell and hence complete the circuit. The magnetic compass is wrapped with the connecting wires. When switched on, current flows through the salt solution, the bulb glows and the needle deflects. Which of the following effects of current is responsible for this?

Discussion

2212.	Is light solid, liquid or gas?
Answer» Is light solid, liquid or gas?

Discussion

2213.	The velocity-time graph of a body with constant acceleration is
Answer» The velocity-time graph of a body with constant acceleration is

Discussion

2214.	why Gauss law applicable to symmetrical bodies only?
Answer» why Gauss law applicable to symmetrical bodies only?

Discussion

2215.	A sharp knife cuts better than a blunt knife. Which of the following is the correct reason for this?
Answer» A sharp knife cuts better than a blunt knife. Which of the following is the correct reason for this?

Discussion

2216.	At what depth below the surface of water will pressure be equal to twice the atmospheric pressure? (Atmospheric pressure = 10 N/cm2, Density of water = 103 kg/m3, g =9.8m/s2)
Answer» At what depth below the surface of water will pressure be equal to twice the atmospheric pressure? (Atmospheric pressure = 10 $N / c m^{2}$ , Density of water = $10^{3} k g / m^{3}$ , g $= 9.8 m / s^{2}$ )

Discussion

2217.	Name the cells on the retina of an eye: (a) which are sensitive to bright light. (b) which are sensitive to dim light. (c) which produce sensation of colour.
Answer» Name the cells on the retina of an eye: (a) which are sensitive to bright light. (b) which are sensitive to dim light. (c) which produce sensation of colour.

2217.

Name the cells on the retina of an eye: (a) which are sensitive to bright light. (b) which are sensitive to dim light. (c) which produce sensation of colour.

Answer»

Name the cells on the retina of an eye:

(a) which are sensitive to bright light.

(b) which are sensitive to dim light.

(c) which produce sensation of colour.

Discussion

2218.	Two mirrors are placed at an angle of 90∘. In order to obtain triple the number of images as obtained in this case, by what angle must one mirror be rotated towards the other mirror?
Answer» Two mirrors are placed at an angle of $90^{\circ}$ . In order to obtain triple the number of images as obtained in this case, by what angle must one mirror be rotated towards the other mirror?

Discussion

2219.	Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.(a) How much work is done by the men in lifting the box?(b) How much work do they do in just holding it?(c) Why do they get tired while holding it? (g=10ms−2)
Answer» Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. (a) How much work is done by the men in lifting the box? (b) How much work do they do in just holding it? (c) Why do they get tired while holding it? $(g = 10 m s^{- 2})$

Discussion

2220.	A natural magnet can self-demagnetise_________
Answer» A natural magnet can self-demagnetise_________

Discussion

2221.	why gravity is not taken as negative in potential energy as the object has displacement opposite to gravity
Answer» why gravity is not taken as negative in potential energy as the object has displacement opposite to gravity

Discussion

2222.	Question 17If air and cloud were good conductors of electricity, do you think lightning could occur? Expalin.
Answer» Question 17 If air and cloud were good conductors of electricity, do you think lightning could occur? Expalin.

2222.

Question 17If air and cloud were good conductors of electricity, do you think lightning could occur? Expalin.

Answer»

Question 17

If air and cloud were good conductors of electricity, do you think lightning could occur? Expalin.

Discussion

2223.	If we do not actually touch objects then how do we fell the object?
Answer» If we do not actually touch objects then how do we fell the object?

Discussion

2224.	H_2, He, O_2 and N_2 travel with same velocity then the longest de-Broglie wavelength should be associated with (1) H_2 (2) He (3) O_2 (4) N_2
Answer» H_2, He, O_2 and N_2 travel with same velocity then the longest de-Broglie wavelength should be associated with (1) H_2 (2) He (3) O_2 (4) N_2

Discussion

2225.	If the excess pressure inside a soap bubble isbalanced by an oil column of height 2 mm,then the surface tension of soap solution will be(r 1 cm, density of oil 0.8 g/cm3)(1) 3.9 N/nm(3) 3.9 x 10- N/m (4) 3.9x 10-1 N/m(2)3.9% 10-2 N/m
Answer» If the excess pressure inside a soap bubble isbalanced by an oil column of height 2 mm,then the surface tension of soap solution will be(r 1 cm, density of oil 0.8 g/cm3)(1) 3.9 N/nm(3) 3.9 x 10- N/m (4) 3.9x 10-1 N/m(2)3.9% 10-2 N/m

Discussion

2226.	A city is going to install the rapid sand filter after the sedimentation tank. Use the following data:Design loading rate to the filter = 200 m3/m2/d ;Design now rate = 0.5 m3/sSurface area per filter box = 50 m2The surface area required for the rapid sand filter will be
Answer» A city is going to install the rapid sand filter after the sedimentation tank. Use the following data: Design loading rate to the filter = 200 $m^{3} / m^{2} / d$ ; Design now rate = 0.5 $m^{3} / s$ Surface area per filter box = 50 $m^{2}$ The surface area required for the rapid sand filter will be

Discussion

2227.	Rate at which work is done is known as___.
Answer» Rate at which work is done is known as___.

Discussion

2228.	The vapour density of undecomposed N2O4 is 46.When heated the vapour density decreases to 24.5 due to its dissociation to NO2. The percentage dissociation of N2O4 i
Answer» The vapour density of undecomposed N2O4 is 46.When heated the vapour density decreases to 24.5 due to its dissociation to NO2. The percentage dissociation of N2O4 i

Discussion

2229.	If the radius of curvature of a concave mirror is 20 cm, then its focal length is:
Answer» If the radius of curvature of a concave mirror is 20 cm, then its focal length is:

Discussion

2230.	Two metallic shells with charges q are kept in air with their centre distance r. The magnitude of electrostatic force between them is:
Answer» Two metallic shells with charges q are kept in air with their centre distance r. The magnitude of electrostatic force between them is:

Discussion

2231.	The largest planet in the Solar System is _____
Answer» The largest planet in the Solar System is _____

Discussion

2232.	A book of mass 980 g is placed on a table. Calculate the force exerted on the book in gravitational metric system in kgf.0.98
Answer» A book of mass $980 g$ is placed on a table. Calculate the force exerted on the book in gravitational metric system in $kgf$ . 0.98

Discussion

2233.	When water is thrown, why they form spherical drops?
Answer» When water is thrown, why they form spherical drops?

Discussion

2234.	Two point charges q and 2q are ppaced some distance apart.If the electric field at the location of q be E,then that at the location of 2q will be
Answer» Two point charges q and 2q are ppaced some distance apart.If the electric field at the location of q be E,then that at the location of 2q will be

Discussion

2235.	About a hundred years ago, the proportion of carbon dioxide in air was about 0.029%. Today it is 0.035%. What is the reason?
Answer» About a hundred years ago, the proportion of carbon dioxide in air was about 0.029%. Today it is 0.035%. What is the reason?

Discussion

2236.	A bicycle of 12 kg has its speed decreased from 12 ms -1 to 7 ms-1 in 2.5 sec. 1. What is the direction of retarding force ? 2. What is the magnitude of force in Newton.
Answer» A bicycle of 12 kg has its speed decreased from 12 ms ^-1 to 7 ms^-1 in 2.5 sec. 1. What is the direction of retarding force ? 2. What is the magnitude of force in Newton.

2236.

A bicycle of 12 kg has its speed decreased from 12 ms -1 to 7 ms-1 in 2.5 sec. 1. What is the direction of retarding force ? 2. What is the magnitude of force in Newton.

Answer»

A bicycle of 12 kg has its speed decreased from 12 ms ^-1 to 7 ms^-1 in 2.5 sec.

1. What is the direction of retarding force ?

2. What is the magnitude of force in Newton.

Discussion

2237.	A solution of concentration CuSO4 is electrolysed for 965 sec with a current of 20A and 50% efficiency. The amount of Cu deposited at cathode will be
Answer» A solution of concentration $C u S O_{4}$ is electrolysed for 965 sec with a current of 20A and 50% efficiency. The amount of $C u$ deposited at cathode will be

Discussion

2238.	how root 3 is an irrational number
Answer» how root 3 is an irrational number

Discussion

2239.	A bike decreases its speed from 60 km h−1 to 40 km h−1 in 5 s. Find the acceleration of the bike.
Answer» A bike decreases its speed from $60 k m h^{- 1} t o 40 k m h^{- 1}$ in 5 s. Find the acceleration of the bike.

Discussion

2240.	What was the name of the first manned space vehicle?
Answer» What was the name of the first manned space vehicle?

Discussion

2241.	A body has an initial velocity of 4 ms−1 and deceleration of 4 ms−2, then what is its final velocity after traveling 2m?
Answer» A body has an initial velocity of 4 $m s^{- 1}$ and deceleration of 4 $m s^{- 2}$ , then what is its final velocity after traveling 2m?

Discussion

2242.	Two stones A and B are dropped from the top of twodifferent towers such that they travel 44.1 m and 63.7m in the last second of their motion, respectively.Find the ratio of the heights of the two towers fromwhere the stones were dropped.
Answer» Two stones A and B are dropped from the top of two different towers such that they travel 44.1 m and 63.7 m in the last second of their motion, respectively. Find the ratio of the heights of the two towers from where the stones were dropped.

Discussion

2243.	Which of the following ray diagrams correctly represents the image formation of an object placed between the centre of curvature and the focus of a concave mirror?
Answer» Which of the following ray diagrams correctly represents the image formation of an object placed between the centre of curvature and the focus of a concave mirror?

Discussion

2244.	Which of the following cannot be charged by rubbing it with neutral bodies?
Answer» Which of the following cannot be charged by rubbing it with neutral bodies?

Discussion

2245.	Friction depends upon
Answer» Friction depends upon

Discussion

2246.	Water in a dish evaporates faster than in a bottle. Give reasons
Answer» Water in a dish evaporates faster than in a bottle. Give reasons

Discussion

2247.	A body is dropped from height H. The time taken to cover second half of the journey is.
Answer» A body is dropped from height H. The time taken to cover second half of the journey is.

Discussion

2248.	A 0.001 molal solution of a complex \lbrack MAgl in waterhas the freezing point of-0.0054^° C, Assuming 100%ionization of the complex salt and K, forH20%: 1.86 km-1, write the correct representation forcomplex(2) \lbrack MA-\rbrack A(4) \lbrack MAgA3(1) \lbrack MAg)(3) (MAl A2
Answer» A 0.001 molal solution of a complex \lbrack MAgl in waterhas the freezing point of-0.0054^° C, Assuming 100%ionization of the complex salt and K, forH20%: 1.86 km-1, write the correct representation forcomplex(2) \lbrack MA-\rbrack A(4) \lbrack MAgA3(1) \lbrack MAg)(3) (MAl A2

Discussion

2249.	State three factors on which depend the linear expansion of a metal rod on heating.
Answer» State three factors on which depend the linear expansion of a metal rod on heating.

Discussion

2250.	s electrons in Ne are same in number as 1) p electrons in O (3) d electrons in Cr (2) d electrons in Fe3+ (4) All of these
Answer» s electrons in Ne are same in number as 1) p electrons in O (3) d electrons in Cr (2) d electrons in Fe3+ (4) All of these

Discussion

Explore topic-wise InterviewSolutions in .

A body starting from rest is moving under a constant acceleration up to 20 sec. If it moves S1 distance infirst 10 sec., and S2 distance in next 10 sec. then S2 will be equal to: (1) S1 (2) 2S1 (3) 3S1 (4) 4S

A body of dimensions 2m×3m×4m is acted upon by a force of 50 N on the top surface (2m×3m). The pressure due to the force on that surface is

When a horizontal force P acts on a cart of mass 20KG , it moves with a uniform velocity on a horizontal floor. When a force of 1.2P acts on the cart , it moves with an acceleration of 0.05m/s² .Find the valve of P?

Electric field in a region is given by 20i + 10j . What will be the electric flux through a square surface of side 10 cm and placed perpendicular to x-axis?

What will happen if there is no key in a circuit?

Why is O2 is more compressible than h2?

What is the difference between voltage, potential difference and electromotive force?

What is the order of discharge of ions?

An ebonite rod is rubbed with fur. Explain the charging of the ebonite rod and the fur on the basis of electron movement.

In the figure shown, the velocity and pressure of the liquid at the cross-section (2) are given by(P0 is the atmospheric pressure)(ρ is the density of the liquid)

Is light solid, liquid or gas?

The velocity-time graph of a body with constant acceleration is

why Gauss law applicable to symmetrical bodies only?

A sharp knife cuts better than a blunt knife. Which of the following is the correct reason for this?

At what depth below the surface of water will pressure be equal to twice the atmospheric pressure? (Atmospheric pressure = 10 N/cm2, Density of water = 103 kg/m3, g =9.8m/s2)

Name the cells on the retina of an eye: (a) which are sensitive to bright light. (b) which are sensitive to dim light. (c) which produce sensation of colour.

Two mirrors are placed at an angle of 90∘. In order to obtain triple the number of images as obtained in this case, by what angle must one mirror be rotated towards the other mirror?

Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.(a) How much work is done by the men in lifting the box?(b) How much work do they do in just holding it?(c) Why do they get tired while holding it? (g=10ms−2)

A natural magnet can self-demagnetise_________

why gravity is not taken as negative in potential energy as the object has displacement opposite to gravity

Question 17If air and cloud were good conductors of electricity, do you think lightning could occur? Expalin.

If we do not actually touch objects then how do we fell the object?

H_2, He, O_2 and N_2 travel with same velocity then the longest de-Broglie wavelength should be associated with (1) H_2 (2) He (3) O_2 (4) N_2

If the excess pressure inside a soap bubble isbalanced by an oil column of height 2 mm,then the surface tension of soap solution will be(r 1 cm, density of oil 0.8 g/cm3)(1) 3.9 N/nm(3) 3.9 x 10- N/m (4) 3.9x 10-1 N/m(2)3.9% 10-2 N/m

A city is going to install the rapid sand filter after the sedimentation tank. Use the following data:Design loading rate to the filter = 200 m3/m2/d ;Design now rate = 0.5 m3/sSurface area per filter box = 50 m2The surface area required for the rapid sand filter will be

Rate at which work is done is known as___.

The vapour density of undecomposed N2O4 is 46.When heated the vapour density decreases to 24.5 due to its dissociation to NO2. The percentage dissociation of N2O4 i

If the radius of curvature of a concave mirror is 20 cm, then its focal length is:

Two metallic shells with charges q are kept in air with their centre distance r. The magnitude of electrostatic force between them is:

The largest planet in the Solar System is _____

A book of mass 980 g is placed on a table. Calculate the force exerted on the book in gravitational metric system in kgf.0.98

When water is thrown, why they form spherical drops?

Two point charges q and 2q are ppaced some distance apart.If the electric field at the location of q be E,then that at the location of 2q will be

About a hundred years ago, the proportion of carbon dioxide in air was about 0.029%. Today it is 0.035%. What is the reason?

A bicycle of 12 kg has its speed decreased from 12 ms -1 to 7 ms​​​​​-1 in 2.5 sec. 1. What is the direction of retarding force ? 2. What is the magnitude of force in Newton.

A solution of concentration CuSO4 is electrolysed for 965 sec with a current of 20A and 50% efficiency. The amount of Cu deposited at cathode will be

how root 3 is an irrational number

A bike decreases its speed from 60 km h−1 to 40 km h−1 in 5 s. Find the acceleration of the bike.

What was the name of the first manned space vehicle?

A body has an initial velocity of 4 ms−1 and deceleration of 4 ms−2, then what is its final velocity after traveling 2m?

Two stones A and B are dropped from the top of twodifferent towers such that they travel 44.1 m and 63.7m in the last second of their motion, respectively.Find the ratio of the heights of the two towers fromwhere the stones were dropped.

Which of the following ray diagrams correctly represents the image formation of an object placed between the centre of curvature and the focus of a concave mirror?

Which of the following cannot be charged by rubbing it with neutral bodies?

Friction depends upon

Water in a dish evaporates faster than in a bottle. Give reasons

A body is dropped from height H. The time taken to cover second half of the journey is.

A 0.001 molal solution of a complex \lbrack MAgl in waterhas the freezing point of-0.0054^° C, Assuming 100%ionization of the complex salt and K, forH20%: 1.86 km-1, write the correct representation forcomplex(2) \lbrack MA-\rbrack A(4) \lbrack MAgA3(1) \lbrack MAg)(3) (MAl A2

State three factors on which depend the linear expansion of a metal rod on heating.

s electrons in Ne are same in number as 1) p electrons in O (3) d electrons in Cr (2) d electrons in Fe3+ (4) All of these

A bicycle of 12 kg has its speed decreased from 12 ms -1 to 7 ms-1 in 2.5 sec. 1. What is the direction of retarding force ? 2. What is the magnitude of force in Newton.