13232 + Interview Questions in Physics Page 42 InterviewSolution

2051.	Q.related to CO2 isotherm when we increase the temperature why? the horizontal line in the dome struture become shorter
Answer» Q.related to CO2 isotherm when we increase the temperature why? the horizontal line in the dome struture become shorter

Discussion

2052.	Why are the ceilings of concert halls curved?
Answer» Why are the ceilings of concert halls curved?

Discussion

2053.	A ship sends out ultrasound that return from the seabed and is detected after 5 s. If the speed of ultrasound through seawater is 1600 ms−1, what is the distance of the seabed from the ship?
Answer» A ship sends out ultrasound that return from the seabed and is detected after $5 s$ . If the speed of ultrasound through seawater is $1600 m s^{- 1}$ , what is the distance of the seabed from the ship?

Discussion

2054.	The mass of the Mount Everest is 810 Trillion kilograms. Express it in megatonne. (1 megatonne = 106 tonne)810000
Answer» The mass of the Mount Everest is 810 Trillion kilograms. Express it in megatonne. (1 megatonne = $10^{6}$ tonne) 810000

Discussion

2055.	The terminal velocity of a steel ball of 4 mm in diameter falling through a glycerin of viscosity 3.3 poise, given relative density of steel is 8, relative density of glycerin is 1.3 is
Answer» The terminal velocity of a steel ball of 4 mm in diameter falling through a glycerin of viscosity 3.3 poise, given relative density of steel is 8, relative density of glycerin is 1.3 is

Discussion

2056.	If 10 g of ice at 0 C is mixed with 10 g of water at 40 C, the final mass of water in the mixture is 1) 10 g 2) 15 g 3) 18 g 4) 20 g
Answer» If 10 g of ice at 0 C is mixed with 10 g of water at 40 C, the final mass of water in the mixture is 1) 10 g 2) 15 g 3) 18 g 4) 20 g

Discussion

2057.	Find the dimensions of the following quantities: (i) the surfaces tension S, (ii) the coefficient of viscosity η. Some equations involving these quantities are S=ρgrh2 and F=−ηAv2−v1x2−x1 Where the symbol have their usual meanings. ρ is density g is acceleration r, h and x are length F is force, A is area.
Answer» Find the dimensions of the following quantities: (i) the surfaces tension S, (ii) the coefficient of viscosity $η$ . Some equations involving these quantities are $S = \frac{ρ g r h}{2}$ and $F = - η A \frac{v_{2} - v_{1}}{x_{2} - x_{1}}$ Where the symbol have their usual meanings. $ρ$ is density g is acceleration r, h and x are length F is force, A is area.

2057.

Find the dimensions of the following quantities: (i) the surfaces tension S, (ii) the coefficient of viscosity η. Some equations involving these quantities are S=ρgrh2 and F=−ηAv2−v1x2−x1 Where the symbol have their usual meanings. ρ is density g is acceleration r, h and x are length F is force, A is area.

Answer»

Find the dimensions of the following quantities:
(i) the surfaces tension S, (ii) the coefficient of viscosity $η$ .

Some equations involving these quantities are

$S = \frac{ρ g r h}{2}$ and $F = - η A \frac{v_{2} - v_{1}}{x_{2} - x_{1}}$

Where the symbol have their usual meanings.

$ρ$ is density g is acceleration r, h and x are length

F is force, A is area.

Discussion

2058.	14.The absolute refractive indices of glass and water are 4/3 & 3/2, respectively. If speed of light in glass is 2x108 m/s , calculate the speed of light in vacum and water.
Answer» 14.The absolute refractive indices of glass and water are 4/3 & 3/2, respectively. If speed of light in glass is 2x108 m/s , calculate the speed of light in vacum and water.

Discussion

2059.	A constant force acts on an object of mass 5kg for duration of 2s. It increases the object velocity from 3m/s to 7m/s. Find the magnitude of applied force. Now if the force was applied for the duration of 5s what would be the final velocity of the object
Answer» A constant force acts on an object of mass 5kg for duration of 2s. It increases the object velocity from 3m/s to 7m/s. Find the magnitude of applied force. Now if the force was applied for the duration of 5s what would be the final velocity of the object

Discussion

2060.	What will be the formula of mass of the earth in terms of acceleration due to gravity (g), radius of earth (R), and universal gravitation constant (G) ?
Answer» What will be the formula of mass of the earth in terms of acceleration due to gravity $(g),$ radius of earth $(R),$ and universal gravitation constant $(G)$ ?

Discussion

2061.	Do all decay series (4n+k) ,where k∈\lbrack0,3\rbrack show gamma radiation
Answer» Do all decay series (4n+k) ,where k∈\lbrack0,3\rbrack show gamma radiation

Discussion

2062.	A rubber ball of mass 50 g falls from a height of 10 cm and rebounds to a height a50 cm. The average force between the ball and the ground is what (taking time of contact as 0.1 s
Answer» A rubber ball of mass 50 g falls from a height of 10 cm and rebounds to a height a50 cm. The average force between the ball and the ground is what (taking time of contact as 0.1 s

Discussion

2063.	What is the intensity of gravitation of rod at axial and equitorial ? (with derivation)
Answer» What is the intensity of gravitation of rod at axial and equitorial ? (with derivation)

Discussion

2064.	If we drop three watermelons weighing 2 kg, 4 kg and 6 kg respectively from the same height and at the same time, which one of it will reach the ground first? (Given: negligible air resistance)
Answer» If we drop three watermelons weighing $2 kg$ , $4 kg$ and $6 kg$ respectively from the same height and at the same time, which one of it will reach the ground first? (Given: negligible air resistance)

Discussion

2065.	A homogeneous solid cylinder of length L (L< H2) Cross-sectional area A5 is immersed such that it floats with its axis vertical at the liquid-liquid interface with length L4 in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure P0. Then density D of solid is given by
Answer» A homogeneous solid cylinder of length L (L< $\frac{H}{2}$ ) Cross-sectional area $\frac{A}{5}$ is immersed such that it floats with its axis vertical at the liquid-liquid interface with length $\frac{L}{4}$ in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure $P_{0}$ . Then density D of solid is given by

2065.

A homogeneous solid cylinder of length L (L< H2) Cross-sectional area A5 is immersed such that it floats with its axis vertical at the liquid-liquid interface with length L4 in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure P0. Then density D of solid is given by

Answer»

A homogeneous solid cylinder of length L (L< $\frac{H}{2}$ ) Cross-sectional area $\frac{A}{5}$ is immersed such that it floats with its axis vertical at the liquid-liquid interface with length $\frac{L}{4}$ in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure $P_{0}$ . Then density D of solid is given by

Discussion

2066.	In a round rotor alternator with negligible resistance, reactive power is maximum at a load angle of ______elec.degrees.0
Answer» In a round rotor alternator with negligible resistance, reactive power is maximum at a load angle of ______elec.degrees. 0

Discussion

2067.	A narrow glass tube 80 cm long opens at both ends is half immersed in mercury now the top of the tube is closed and is taken out of mercury. A column of mercury 20cm long remains in the tube. Find Atmospheric pressure.
Answer» A narrow glass tube 80 cm long opens at both ends is half immersed in mercury now the top of the tube is closed and is taken out of mercury. A column of mercury 20cm long remains in the tube. Find Atmospheric pressure.

Discussion

2068.	1. All central forces are conservative and central forces are functions of position only2. all conservative forces are functions of position only.(a) both statements are true(b) both statements are wrong(c) first is true second wrong(d) first is wrong second is true
Answer» 1. All central forces are conservative and central forces are functions of position only 2. all conservative forces are functions of position only. (a) both statements are true (b) both statements are wrong (c) first is true second wrong (d) first is wrong second is true

Discussion

2069.	The density of a cube is measured by measuring its mass and length of its sides. If the maximum error in the measurement of mass and lengths are 3% and 2% respectively. The maximum % error in the measurement of density would be
Answer» The density of a cube is measured by measuring its mass and length of its sides. If the maximum error in the measurement of mass and lengths are $3 %$ and $2 %$ respectively. The maximum $%$ error in the measurement of density would be

Discussion

2070.	nta person driving a car with a speed 72km/h, suddenly sees a boy crossing the road. if the distance moved by car, before the person applies brakes is 5m, the reaction time of the person is :-n nt(1)0.5s (2)0.10sn nt(3)10s (4)0.25sn
Answer» nta person driving a car with a speed 72km/h, suddenly sees a boy crossing the road. if the distance moved by car, before the person applies brakes is 5m, the reaction time of the person is :-n nt(1)0.5s (2)0.10sn nt(3)10s (4)0.25sn

Discussion

2071.	If e is the electric charge of an electron, c is the speed of light in free space, and h is planck's constant, ϵ0 is permittivity of free space. The dimension of e24πϵ0hc is
Answer» If $e$ is the electric charge of an electron, $c$ is the speed of light in free space, and $h$ is planck's constant, $ϵ_{0}$ is permittivity of free space. The dimension of $\frac{e^{2}}{4 π ϵ_{0} h c}$ is

Discussion

2072.	defination ofr free fall
Answer» defination ofr free fall

Discussion

2073.	38. What is molecular weight if 12gm alkaline earth metal gives 14.8gm metal nitride
Answer» 38. What is molecular weight if 12gm alkaline earth metal gives 14.8gm metal nitride

Discussion

2074.	The phenomenon of light hitting a surface and then bouncing off is termed as:-
Answer» The phenomenon of light hitting a surface and then bouncing off is termed as:-

Discussion

2075.	I saw individual stars, but I could not distinguish who they belonged to. Then dawn came and put out all my stars.Therefore constellation means___________________.Clue: Opposite of individual
Answer» I saw individual stars, but I could not distinguish who they belonged to. Then dawn came and put out all my stars. Therefore constellation means___________________. Clue: Opposite of individual

2075.

I saw individual stars, but I could not distinguish who they belonged to. Then dawn came and put out all my stars.Therefore constellation means___________________.Clue: Opposite of individual

Answer»

I saw individual stars, but I could not distinguish who they belonged to. Then dawn came and put out all my stars.

Therefore constellation means___________________.

Clue: Opposite of individual

Discussion

2076.	State two factors on which the work done on a body depends.
Answer» State two factors on which the work done on a body depends.

Discussion

2077.	Draw a velocity-time graph for a body moving with an initial velocity u and uniform acceleration a.Use this graph to find the distance travelled by the body in time t.
Answer» Draw a velocity-time graph for a body moving with an initial velocity u and uniform acceleration a.Use this graph to find the distance travelled by the body in time t.

Discussion

2078.	(a) Which radiation or particle from radioactivity produces maximum biological damage? (b) State three precautions that must be taken while handling a radioactive source. [3 MARKS]
Answer» (a) Which radiation or particle from radioactivity produces maximum biological damage? (b) State three precautions that must be taken while handling a radioactive source. [3 MARKS]

Discussion

2079.	Two bodies of masses m1 and m2 having equal kinetic energies. If p1 and p2 are their momentum respectively, Then the ratio of p1 and p2 is.
Answer» Two bodies of masses m₁ and m₂ having equal kinetic energies. If p₁ and p₂ are their momentum respectively, Then the ratio of p₁ and p₂ is.

Discussion

2080.	An object of mass 12kg moving with a velocity of 5m/sec find the force required to stop the object at a distance of 10m
Answer» An object of mass 12kg moving with a velocity of 5m/sec find the force required to stop the object at a distance of 10m

Discussion

2081.	In hydrogen atom if potential energy of first exited state is taken as reference zero potential then total energy of ground state will be 6.8eV -6.8eV 13.6eV -13.6eV
Answer» In hydrogen atom if potential energy of first exited state is taken as reference zero potential then total energy of ground state will be 6.8eV -6.8eV 13.6eV -13.6eV

Discussion

2082.	A plane sound wave is travelling in a medium. With reference to a frame A, its equation is: y=a cos [ωt−kx].With reference to a frame B, moving with a constant velocity v in the direction of propagation of the wave, equation of the wave cannot be
Answer» A plane sound wave is travelling in a medium. With reference to a frame A, its equation is: $y = a c o s [ω t - k x]$ . With reference to a frame B, moving with a constant velocity v in the direction of propagation of the wave, equation of the wave cannot be

Discussion

2083.	Derive the 1st equation of motion.
Answer» Derive the 1st equation of motion.

Discussion

2084.	Rafeeq goes to trekking, and finds a cave. He shouts into it, and hears his echo after 4.5 s. How long is the cave in km? Take the speed of sound in the air to be 340 m s−1.0.765
Answer» Rafeeq goes to trekking, and finds a cave. He shouts into it, and hears his echo after $4.5 s$ . How long is the cave in $km$ ? Take the speed of sound in the air to be $340 m s^{- 1}$ . 0.765

Discussion

2085.	Answer the following questions in your own words.a. What is an echo? What factors are important to get a distinct echo?b. Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there.c. What should be the dimensions and the shape of classrooms so that no echo can be produced there?
Answer» Answer the following questions in your own words. a. What is an echo? What factors are important to get a distinct echo? b. Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there. c. What should be the dimensions and the shape of classrooms so that no echo can be produced there?

Discussion

2086.	A car accelerates from rest at a constant rate α for some time after which it decelerates at a constant rate β to come to rest. If the total time of journey is t, then the maximum velocity acquired by the car is given by
Answer» A car accelerates from rest at a constant rate $α$ for some time after which it decelerates at a constant rate $β$ to come to rest. If the total time of journey is $t$ , then the maximum velocity acquired by the car is given by

Discussion

2087.	The radius of curvature of a concave mirror is 12cm. Then, the focal length will be1) 6 cm2) -6 cm3) 24 cm
Answer» The radius of curvature of a concave mirror is 12cm. Then, the focal length will be 1) 6 cm 2) -6 cm 3) 24 cm

Discussion

2088.	Explain the principle behind the working of a maglev train.
Answer» Explain the principle behind the working of a maglev train.

Discussion

2089.	A and B are two hills at a distance 510 m apart. A person standing between the hills, claps his hands andhear two echoes at the end of 1 second and 2 second. What is the velocity of sound in air (in m/s)?
Answer» A and B are two hills at a distance 510 m apart. A person standing between the hills, claps his hands andhear two echoes at the end of 1 second and 2 second. What is the velocity of sound in air (in m/s)?

Discussion

2090.	A bus starts from test and attains 40 km h1 velocity after 10 sec calculate the acceleration of the bus in km h2 and in m s2
Answer» A bus starts from test and attains 40 km h¹velocity after 10 sec calculate the acceleration of the bus in km h²and in m s²

Discussion

2091.	The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on the planet B. A man jumps to a height of 2m on the surface A. What is the height of jump by the same person on the plane B?
Answer» The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on the planet B. A man jumps to a height of 2m on the surface A. What is the height of jump by the same person on the plane B?

Discussion

2092.	Following is the distance time table of a body of mass 100 gram in motion. Time in seconds distance in metre 3 27 5 125 Calculate the force acting on it?
Answer» Following is the distance time table of a body of mass 100 gram in motion. Time in seconds distance in metre 3 27 5 125 Calculate the force acting on it?

2092.

Following is the distance time table of a body of mass 100 gram in motion. Time in seconds distance in metre 3 27 5 125 Calculate the force acting on it?

Answer»

Following is the distance time table of a body of mass 100 gram in motion.

Time in seconds distance in metre

3 27

5 125

Calculate the force acting on it?

Discussion

2093.	Which of the following characteristics does the force of gravity between two objects does not depend on?
Answer» Which of the following characteristics does the force of gravity between two objects does not depend on?

Discussion

2094.	What is normal force ?
Answer» What is normal force ?

Discussion

2095.	Calculate the de Broglie wavelength of a body of mass 0.1mg moving with velocity 10m/s
Answer» Calculate the de Broglie wavelength of a body of mass 0.1mg moving with velocity 10m/s

Discussion

2096.	A solid weighs 75 grams in air and 55.6 grams in water.Find its relative density and the volume of water displaced by the solid
Answer» A solid weighs 75 grams in air and 55.6 grams in water.Find its relative density and the volume of water displaced by the solid

Discussion

2097.	निम्नलिखित का आशय स्पष्ट कीजिए −वे उलटकर चोट भी करेंगे और तब काँच और हीरे का भेद जानना बाकी न रहेगा।
Answer» निम्नलिखित का आशय स्पष्ट कीजिए − वे उलटकर चोट भी करेंगे और तब काँच और हीरे का भेद जानना बाकी न रहेगा।

2097.

निम्नलिखित का आशय स्पष्ट कीजिए −वे उलटकर चोट भी करेंगे और तब काँच और हीरे का भेद जानना बाकी न रहेगा।

Answer»

निम्नलिखित का आशय स्पष्ट कीजिए −

वे उलटकर चोट भी करेंगे और तब काँच और हीरे का भेद जानना बाकी न रहेगा।

Discussion

2098.	Question 19 Derive the unit a force using the second law of motion. A force of 5 N produces an acceleration of 8 ms−2 on a mass m1 and an acceleration of 24 ms−2 on mass m2. What acceleration would the same force provide if both the masses are tired together?
Answer» Question 19 Derive the unit a force using the second law of motion. A force of 5 N produces an acceleration of $8 m s^{- 2}$ on a mass $m_{1}$ and an acceleration of $24 m s^{- 2}$ on mass $m_{2}$ . What acceleration would the same force provide if both the masses are tired together?

Discussion

2099.	A cart of weight 10N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N (parallel to the ramp), raising the cart 0.50 m above its initial level. Calculate the percentage efficiency of the work?
Answer» A cart of weight 10N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N (parallel to the ramp), raising the cart 0.50 m above its initial level. Calculate the percentage efficiency of the work?

Discussion

2100.	For the bolted bracket connection shown in figure, the force (in kN round off to two decimals) experienced by bolt 3 will be ____.95
Answer» For the bolted bracket connection shown in figure, the force (in kN round off to two decimals) experienced by bolt 3 will be ____. 95

Discussion

Explore topic-wise InterviewSolutions in .

Q.related to CO2 isotherm when we increase the temperature why? the horizontal line in the dome struture become shorter

Why are the ceilings of concert halls curved?

A ship sends out ultrasound that return from the seabed and is detected after 5 s. If the speed of ultrasound through seawater is 1600 ms−1, what is the distance of the seabed from the ship?

The mass of the Mount Everest is 810 Trillion kilograms. Express it in megatonne. (1 megatonne = 106 tonne)810000

The terminal velocity of a steel ball of 4 mm in diameter falling through a glycerin of viscosity 3.3 poise, given relative density of steel is 8, relative density of glycerin is 1.3 is

If 10 g of ice at 0 C is mixed with 10 g of water at 40 C, the final mass of water in the mixture is 1) 10 g 2) 15 g 3) 18 g 4) 20 g

14.The absolute refractive indices of glass and water are 4/3 & 3/2, respectively. If speed of light in glass is 2x108 m/s , calculate the speed of light in vacum and water.

A constant force acts on an object of mass 5kg for duration of 2s. It increases the object velocity from 3m/s to 7m/s. Find the magnitude of applied force. Now if the force was applied for the duration of 5s what would be the final velocity of the object

What will be the formula of mass of the earth in terms of acceleration due to gravity (g), radius of earth (R), and universal gravitation constant (G) ?

Do all decay series (4n+k) ,where k∈\lbrack0,3\rbrack show gamma radiation

A rubber ball of mass 50 g falls from a height of 10 cm and rebounds to a height a50 cm. The average force between the ball and the ground is what (taking time of contact as 0.1 s

What is the intensity of gravitation of rod at axial and equitorial ? (with derivation)

If we drop three watermelons weighing 2 kg, 4 kg and 6 kg respectively from the same height and at the same time, which one of it will reach the ground first? (Given: negligible air resistance)

In a round rotor alternator with negligible resistance, reactive power is maximum at a load angle of ______elec.degrees.0

A narrow glass tube 80 cm long opens at both ends is half immersed in mercury now the top of the tube is closed and is taken out of mercury. A column of mercury 20cm long remains in the tube. Find Atmospheric pressure.

1. All central forces are conservative and central forces are functions of position only2. all conservative forces are functions of position only.(a) both statements are true(b) both statements are wrong(c) first is true second wrong(d) first is wrong second is true

The density of a cube is measured by measuring its mass and length of its sides. If the maximum error in the measurement of mass and lengths are 3% and 2% respectively. The maximum % error in the measurement of density would be

nta person driving a car with a speed 72km/h, suddenly sees a boy crossing the road. if the distance moved by car, before the person applies brakes is 5m, the reaction time of the person is :-n nt(1)0.5s (2)0.10sn nt(3)10s (4)0.25sn

If e is the electric charge of an electron, c is the speed of light in free space, and h is planck's constant, ϵ0 is permittivity of free space. The dimension of e24πϵ0hc is

defination ofr free fall

38. What is molecular weight if 12gm alkaline earth metal gives 14.8gm metal nitride

The phenomenon of light hitting a surface and then bouncing off is termed as:-

I saw individual stars, but I could not distinguish who they belonged to. Then dawn came and put out all my stars.Therefore constellation means___________________.Clue: Opposite of individual

State two factors on which the work done on a body depends.

Draw a velocity-time graph for a body moving with an initial velocity u and uniform acceleration a.Use this graph to find the distance travelled by the body in time t.

(a) Which radiation or particle from radioactivity produces maximum biological damage? (b) State three precautions that must be taken while handling a radioactive source. [3 MARKS]

Two bodies of masses m1 and m2 having equal kinetic energies. If p1 and p2 are their momentum respectively, Then the ratio of p1 and p2 is.

An object of mass 12kg moving with a velocity of 5m/sec find the force required to stop the object at a distance of 10m

In hydrogen atom if potential energy of first exited state is taken as reference zero potential then total energy of ground state will be 6.8eV -6.8eV 13.6eV -13.6eV

A plane sound wave is travelling in a medium. With reference to a frame A, its equation is: y=a cos [ωt−kx].With reference to a frame B, moving with a constant velocity v in the direction of propagation of the wave, equation of the wave cannot be

Derive the 1st equation of motion.

Rafeeq goes to trekking, and finds a cave. He shouts into it, and hears his echo after 4.5 s. How long is the cave in km? Take the speed of sound in the air to be 340 m s−1.0.765

A car accelerates from rest at a constant rate α for some time after which it decelerates at a constant rate β to come to rest. If the total time of journey is t, then the maximum velocity acquired by the car is given by

The radius of curvature of a concave mirror is 12cm. Then, the focal length will be1) 6 cm2) -6 cm3) 24 cm

Explain the principle behind the working of a maglev train.

A and B are two hills at a distance 510 m apart. A person standing between the hills, claps his hands andhear two echoes at the end of 1 second and 2 second. What is the velocity of sound in air (in m/s)?

A bus starts from test and attains 40 km h1 velocity after 10 sec calculate the acceleration of the bus in km h2 and in m s2

The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on the planet B. A man jumps to a height of 2m on the surface A. What is the height of jump by the same person on the plane B?

Following is the distance time table of a body of mass 100 gram in motion. Time in seconds distance in metre 3 27 5 125 Calculate the force acting on it?

Which of the following characteristics does the force of gravity between two objects does not depend on?

What is normal force ?

Calculate the de Broglie wavelength of a body of mass 0.1mg moving with velocity 10m/s

A solid weighs 75 grams in air and 55.6 grams in water.Find its relative density and the volume of water displaced by the solid

निम्नलिखित का आशय स्पष्ट कीजिए −वे उलटकर चोट भी करेंगे और तब काँच और हीरे का भेद जानना बाकी न रहेगा।

Question 19 Derive the unit a force using the second law of motion. A force of 5 N produces an acceleration of 8 ms−2 on a mass m1 and an acceleration of 24 ms−2 on mass m2. What acceleration would the same force provide if both the masses are tired together?

A cart of weight 10N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N (parallel to the ramp), raising the cart 0.50 m above its initial level. Calculate the percentage efficiency of the work?

For the bolted bracket connection shown in figure, the force (in kN round off to two decimals) experienced by bolt 3 will be ____.95