13232 + Interview Questions in Physics Page 124 InterviewSolution

6151.	Why density is a scalar quantity?
Answer» Why density is a scalar quantity?

Discussion

6152.	Among the following gases, find the number of gases that are polar, planar as well as having the greenhouse effect.(i) Water vapour(ii) Carbon dioxide (iii) Nitrogen(iv) Methane (v) Nitrous oxide (vi) Ozone(vii) Sulphur dioxide
Answer» Among the following gases, find the number of gases that are polar, planar as well as having the greenhouse effect. (i) Water vapour (ii) Carbon dioxide (iii) Nitrogen (iv) Methane (v) Nitrous oxide (vi) Ozone (vii) Sulphur dioxide

Discussion

6153.	49.A smooth massless string passes over a smooth fixed pulley. Two masses M1 and M2 (M1>M2) are tied at the two ends of the string. The masses are allowed to move under gravity starting from rest. The total external force on the two masses is : A) (m1+m2)g B) (m1-m2)(m1-m2)g/(m1+m2) C) (m1-m2)g D) (m1+m2)(m1+m2)g/(m1-m2)
Answer» 49.A smooth massless string passes over a smooth fixed pulley. Two masses M1 and M2 (M1>M2) are tied at the two ends of the string. The masses are allowed to move under gravity starting from rest. The total external force on the two masses is : A) (m1+m2)g B) (m1-m2)(m1-m2)g/(m1+m2) C) (m1-m2)g D) (m1+m2)(m1+m2)g/(m1-m2)

Discussion

6154.	Considering the motion of the object whose velocity-time graph is given in the diagram, calculate the total displacement till 16 seconds?
Answer» Considering the motion of the object whose velocity-time graph is given in the diagram, calculate the total displacement till 16 seconds?

6154.

Considering the motion of the object whose velocity-time graph is given in the diagram, calculate the total displacement till 16 seconds?

Answer»

Considering the motion of the object whose velocity-time graph is given in the diagram, calculate the total displacement till 16 seconds?

Discussion

6155.	A piezo electric quartz crystal of thickness 0.005 m is vibrating in resonate conditions. Calculate the fundamental frequency f0 for quartz.Y=8×1010 Nm−2 and ρ=2.65×103 kgm−3
Answer» A piezo electric quartz crystal of thickness $0.005 m$ is vibrating in resonate conditions. Calculate the fundamental frequency $f_{0}$ for quartz. $Y = 8 \times 10^{10} {Nm}^{- 2}$ and $ρ = 2.65 \times 10^{3} {kgm}^{- 3}$

Discussion

6156.	13. A .66kg ball is moving with a speed of 100 m/s. the associated wavelength will be ( h: 6.610 -34
Answer» 13. A .66kg ball is moving with a speed of 100 m/s. the associated wavelength will be ( h: 6.610 -34

Discussion

6157.	24.Why cant electric feild lines produce a closed loop?
Answer» 24.Why cant electric feild lines produce a closed loop?

Discussion

6158.	acceleration due to gravity at surface of a planet is equal to that at surface of earth and density is 1.5 times that of earth.if radius of earth is R, radius ofplanet is 1) 3/2 R 2)2/3 R 3) 9/4 R 4) 4/9
Answer» acceleration due to gravity at surface of a planet is equal to that at surface of earth and density is 1.5 times that of earth.if radius of earth is R, radius ofplanet is 1) 3/2 R 2)2/3 R 3) 9/4 R 4) 4/9

Discussion

6159.	Which property of sound enables us to distinguish between the sounds produced by different sources?
Answer» Which property of sound enables us to distinguish between the sounds produced by different sources?

Discussion

6160.	Question 2(ii)Draw a graph for the followingSide of square(in cm)23456Area (in cm2)49162536Is it a linear graph?
Answer» Question 2(ii) Draw a graph for the following $\begin{matrix} S i d e o f s q u a r e (i n c m) & 2 & 3 & 4 & 5 & 6 A r e a (i n c m^{2}) & 4 & 9 & 16 & 25 & 36 \end{matrix}$ Is it a linear graph?

Discussion

6161.	What is the speed of the object in the 10 second interval from 40-50 seconds?
Answer» What is the speed of the object in the 10 second interval from 40-50 seconds?

6161.

What is the speed of the object in the 10 second interval from 40-50 seconds?

Answer»

What is the speed of the object in the 10 second interval from 40-50 seconds?

Discussion

6162.	A ray of light is incident at an angle of 45∘ on a square slab of a transparent material. What should be the refractive index of the material of the slab so that the emergent ray travels along the vertical face AB?
Answer» A ray of light is incident at an angle of $45^{\circ}$ on a square slab of a transparent material. What should be the refractive index of the material of the slab so that the emergent ray travels along the vertical face AB?

Discussion

6163.	A gun with a muzzle velocity of 500m/s shoots a bullet at a bird 50 m away. To hit the bird, the gun should be aimed (g=10m/s^2)
Answer» A gun with a muzzle velocity of 500m/s shoots a bullet at a bird 50 m away. To hit the bird, the gun should be aimed (g=10m/s^2)

Discussion

6164.	A circular disc of radius R has a uniform thickness. A circular hole of diameter equal to the radius of the disc has been cut out as shown in figure. Find the centre of mass of the remaining disc.
Answer» A circular disc of radius R has a uniform thickness. A circular hole of diameter equal to the radius of the disc has been cut out as shown in figure. Find the centre of mass of the remaining disc.

Discussion

6165.	Explain the following terms- Incident ray, reflected ray, angle of incidence, angle of reflection, normal.
Answer» Explain the following terms- Incident ray, reflected ray, angle of incidence, angle of reflection, normal.

Discussion

6166.	A cold body is placed between two hot bodies. Which of the following will be the correct direction of heat flow?
Answer» A cold body is placed between two hot bodies. Which of the following will be the correct direction of heat flow?

Discussion

6167.	A conductor of uniform cross section and 60m long has a voltage drop of 1.2 V and a current densityof 2.56×105A/m2. The conductivity of the material in the conductor is___ ×104S/m 1.28
Answer» A conductor of uniform cross section and 60m long has a voltage drop of 1.2 V and a current densityof $2.56 \times 10^{5} A / m^{2}$ . The conductivity of the material in the conductor is___ $\times 10^{4} S / m$ 1.28

Discussion

6168.	A ball projected vertically upwards from the top of a tower,with a velocity 20m/sec reaches the ground in t_{1 }seconds. If it is projected vertically downwards from the top with the same velocity,it reaches the ground in t_2 seconds. Relationship between t_1 & t_2 will be: {(a)}t_1-t_2=4 (b)t_{2-}t_1=4 (c)t_1+t_2=4 (d)None of these
Answer» A ball projected vertically upwards from the top of a tower,with a velocity 20m/sec reaches the ground in t_{1 }seconds. If it is projected vertically downwards from the top with the same velocity,it reaches the ground in t_2 seconds. Relationship between t_1 & t_2 will be: {(a)}t_1-t_2=4 (b)t_{2-}t_1=4 (c)t_1+t_2=4 (d)None of these

Discussion

6169.	Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h. Assuming all conditions are identical, then
Answer» Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h. Assuming all conditions are identical, then

Discussion

6170.	A feather of mass 10 gram is dropped from a height. It is found to fall down with a constant velocity. What is the net force acting on it?
Answer» A feather of mass 10 gram is dropped from a height. It is found to fall down with a constant velocity. What is the net force acting on it?

Discussion

6171.	An object travels around a circle of radius 6 m with speed 3π ms−1. Find the distance and displacement after 3 s.
Answer» An object travels around a circle of radius $6 m$ with speed $3 π m s^{- 1}$ . Find the distance and displacement after $3 s$ .

Discussion

6172.	A beam of light is falling on a glass plate at an angle 60∘. It is found that the reflected light is completely polarized. The angle of refraction when angle of incidence is 45∘ is
Answer» A beam of light is falling on a glass plate at an angle $60^{\circ}$ . It is found that the reflected light is completely polarized. The angle of refraction when angle of incidence is $45^{\circ}$ is

Discussion

6173.	In case of hydrometer for heavier liquids
Answer» In case of hydrometer for heavier liquids

Discussion

6174.	During night time, an area of low pressure is formed on which of the following?
Answer» During night time, an area of low pressure is formed on which of the following?

Discussion

6175.	Magnitude of force F experienced by a certain object moving with speed v is given by F = Kv3, where K is a constant. The dimensions of K are
Answer» Magnitude of force F experienced by a certain object moving with speed v is given by F = Kv³, where K is a constant. The dimensions of K are

Discussion

6176.	36. A stone weighing 3 kg fall from top of tower of 100 m and buries itself 2 m deep in sand the time of penetration is ?
Answer» 36. A stone weighing 3 kg fall from top of tower of 100 m and buries itself 2 m deep in sand the time of penetration is ?

Discussion

6177.	Masses of two bodies are made four times each. How should the distance between them be changed, so that the gravitational force between them is doubled?
Answer» Masses of two bodies are made four times each. How should the distance between them be changed, so that the gravitational force between them is doubled?

Discussion

6178.	Which of the following units is not a fundamental unit?
Answer» Which of the following units is not a fundamental unit?

Discussion

6179.	define the term retardation.give 2 examples of such motion.
Answer» define the term retardation.give 2 examples of such motion.

Discussion

6180.	The weight of a stone in air is 25 N and the weight of the stone when submerged in water is 20 N. What is the relative density of the stone?
Answer» The weight of a stone in air is 25 N and the weight of the stone when submerged in water is 20 N. What is the relative density of the stone?

6180.

The weight of a stone in air is 25 N and the weight of the stone when submerged in water is 20 N. What is the relative density of the stone?

Answer»

The weight of a stone in air is 25 N and the weight of the stone when submerged in water is 20 N. What is the relative density of the stone?

Discussion

6181.	A bus moving with a velocity of 60 km/h is brought to rest in 20 sec by applying the brake, find acceleration.
Answer» A bus moving with a velocity of 60 km/his brought to rest in 20 sec by applying the brake, find acceleration.

Discussion

6182.	Look at the following figure and choose the correct statement regarding sound propagation in this case.
Answer» Look at the following figure and choose the correct statement regarding sound propagation in this case.

6182.

Look at the following figure and choose the correct statement regarding sound propagation in this case.

Answer»

Look at the following figure and choose the correct statement regarding sound propagation in this case.

Discussion

6183.	The wheel of a car is running at a speed of 50 m/s if the angular speed of the wheel is 500 rad/s then, the radius of the wheel is:
Answer» The wheel of a car is running at a speed of $50 m/s$ if the angular speed of the wheel is $500 rad/s$ then, the radius of the wheel is:

Discussion

6184.	A kid pushes his toy of weight 100 grams along a distance of 5 m on the floor of his house by applying a force of magnitude 9.0 N. What is the energy that has to be put in by the kid for displacing the toy? Is there any change in potential energy possessed by the toy?
Answer» A kid pushes his toy of weight 100 grams along a distance of 5 m on the floor of his house by applying a force of magnitude 9.0 N. What is the energy that has to be put in by the kid for displacing the toy? Is there any change in potential energy possessed by the toy?

Discussion

6185.	A wooden block of mass 20 kg has density 800 kg/m3. What could be the maximum mass that can be placed on the wooden block so that the block floats just below the water surface?
Answer» A wooden block of mass 20 kg has density $800 k g / m^{3} .$ What could be the maximum mass that can be placed on the wooden block so that the block floats just below the water surface?

Discussion

6186.	how to derive tension in loop kept in magnetic field is equal to RIB, where r is radius of loop ,I is current and B is magnetic field
Answer» how to derive tension in loop kept in magnetic field is equal to RIB, where r is radius of loop ,I is current and B is magnetic field

Discussion

6187.	What is the nature of image formed by concave mirror if magnification produced by mirror is +3.
Answer» What is the nature of image formed by concave mirror if magnification produced by mirror is +3.

Discussion

6188.	If the radius of the earth shrinks by 1.5% (mass remaining same), Then the value of acceleration due to gravity changes by___.
Answer» If the radius of the earth shrinks by $1.5 %$ (mass remaining same), Then the value of acceleration due to gravity changes by___.

Discussion

6189.	30.If velocity v of a particle at a distance x from originis given as v=a2- x2 ÷ x2 hole root then it's acceleration isproportional to(1)X(2)(c)(D>
Answer» 30.If velocity v of a particle at a distance x from originis given as v=a2- x2 ÷ x2 hole root then it's acceleration isproportional to(1)X(2)(c)(D>

Discussion

6190.	A screw gauge has leastcount of 0.01mm and there are 50 division in its circular scale the pitch of the screw gauge is
Answer» A screw gauge has leastcount of 0.01mm and there are 50 division in its circular scale the pitch of the screw gauge is

Discussion

6191.	In a pre - tensioned beam, the ultimate shrinkage strain and ultimate creep coefficient are 250×10−6 and 1.6 respectively. Given Es and Ec are 210 GPa and 35 GPa, respectively. The stress in concrete at the level of steel, considering loss due to creep as two times the loss due to shrinkage, is equal to ________ N/mm2.10.94
Answer» In a pre - tensioned beam, the ultimate shrinkage strain and ultimate creep coefficient are $250 \times 10^{- 6}$ and 1.6 respectively. Given $E_{s}$ and $E_{c}$ are 210 GPa and 35 GPa, respectively. The stress in concrete at the level of steel, considering loss due to creep as two times the loss due to shrinkage, is equal to ________ $N / m m^{2}$ . 10.94

Discussion

6192.	A single slit of width 0.14 mm is illuminated normally by monochromatic light and diffraction bands are observed on a screen 2 m away. If the centre of the second dark band is 1.6 cm from the middle of the central bright band, the wavelength of light used.
Answer» A single slit of width $0.14 mm$ is illuminated normally by monochromatic light and diffraction bands are observed on a screen $2 m$ away. If the centre of the second dark band is $1.6 cm$ from the middle of the central bright band, the wavelength of light used.

Discussion

6193.	Which among the below statements is the correct statement for Ohm’s Law?
Answer» Which among the below statements is the correct statement for Ohm’s Law?

Discussion

6194.	Two points have a potential difference of 10 V. After connecting a conductor with zero resistance between the points, the final potential at each point becomes 25 V. What could be their initial potentials?
Answer» Two points have a potential difference of 10 V. After connecting a conductor with zero resistance between the points, the final potential at each point becomes 25 V. What could be their initial potentials?

Discussion

6195.	The rear side of truck is open and a box of 40 kg mass is placed 5m away from its open end. The coefficient of friction between the box and the surface below it is 0.15. On a straight road, the truck starts from rest and accelerates with 2m/s2. The distance covered by the truck from the starting point until the box falls off (ignore the size of the box)? ___
Answer» The rear side of truck is open and a box of 40 kg mass is placed 5m away from its open end. The coefficient of friction between the box and the surface below it is 0.15. On a straight road, the truck starts from rest and accelerates with 2m/s $^{2}$ . The distance covered by the truck from the starting point until the box falls off (ignore the size of the box)? ___

6195.

The rear side of truck is open and a box of 40 kg mass is placed 5m away from its open end. The coefficient of friction between the box and the surface below it is 0.15. On a straight road, the truck starts from rest and accelerates with 2m/s2. The distance covered by the truck from the starting point until the box falls off (ignore the size of the box)? ___

Answer»

The rear side of truck is open and a box of 40 kg mass is placed 5m away from its open end. The coefficient of friction between the box and the surface below it is 0.15. On a straight road, the truck starts from rest and accelerates with 2m/s $^{2}$ . The distance covered by the truck from the starting point until the box falls off (ignore the size of the box)?

___

Discussion

6196.	A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? give reasons for your answer.
Answer» A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? give reasons for your answer.

Discussion

6197.	Force required change the momentum from 36km/hr to 90km/hr in a time interval of 5 seconds is
Answer» Force required change the momentum from 36km/hr to 90km/hr in a time interval of 5 seconds is

Discussion

6198.	Name the three characteristics of sound.
Answer» Name the three characteristics of sound.

Discussion

6199.	Why is mante of earth so much hot? If Thousands of meteorite sun at the same time then sun will move away from its place or will stay there?
Answer» Why is mante of earth so much hot? If Thousands of meteorite sun at the same time then sun will move away from its place or will stay there?

Discussion

6200.	The Olympic high jump record of 2.45m is held by Cuba. If acceleration due to gravity on the earth was – 1msec2 and not -10msec2. Calculate the height to which the jumper would have jumped.
Answer» The Olympic high jump record of 2.45m is held by Cuba. If acceleration due to gravity on the earth was – 1 $\frac{m}{{s e c}^{2}}$ and not -10 $\frac{m}{{s e c}^{2}}$ . Calculate the height to which the jumper would have jumped.

Discussion

Explore topic-wise InterviewSolutions in .

Why density is a scalar quantity?

Among the following gases, find the number of gases that are polar, planar as well as having the greenhouse effect.(i) Water vapour(ii) Carbon dioxide (iii) Nitrogen(iv) Methane (v) Nitrous oxide (vi) Ozone(vii) Sulphur dioxide

Considering the motion of the object whose velocity-time graph is given in the diagram, calculate the total displacement till 16 seconds?

A piezo electric quartz crystal of thickness 0.005 m is vibrating in resonate conditions. Calculate the fundamental frequency f0 for quartz.Y=8×1010 Nm−2 and ρ=2.65×103 kgm−3

13. A .66kg ball is moving with a speed of 100 m/s. the associated wavelength will be ( h: 6.610 -34

24.Why cant electric feild lines produce a closed loop?

acceleration due to gravity at surface of a planet is equal to that at surface of earth and density is 1.5 times that of earth.if radius of earth is R, radius ofplanet is 1) 3/2 R 2)2/3 R 3) 9/4 R 4) 4/9

Which property of sound enables us to distinguish between the sounds produced by different sources?

Question 2(ii)Draw a graph for the followingSide of square(in cm)23456Area (in cm2)49162536Is it a linear graph?

What is the speed of the object in the 10 second interval from 40-50 seconds?

A ray of light is incident at an angle of 45∘ on a square slab of a transparent material. What should be the refractive index of the material of the slab so that the emergent ray travels along the vertical face AB?

A gun with a muzzle velocity of 500m/s shoots a bullet at a bird 50 m away. To hit the bird, the gun should be aimed (g=10m/s^2)

A circular disc of radius R has a uniform thickness. A circular hole of diameter equal to the radius of the disc has been cut out as shown in figure. Find the centre of mass of the remaining disc.

Explain the following terms- Incident ray, reflected ray, angle of incidence, angle of reflection, normal.

A cold body is placed between two hot bodies. Which of the following will be the correct direction of heat flow?

A conductor of uniform cross section and 60m long has a voltage drop of 1.2 V and a current densityof 2.56×105A/m2. The conductivity of the material in the conductor is___ ×104S/m 1.28

Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h. Assuming all conditions are identical, then

A feather of mass 10 gram is dropped from a height. It is found to fall down with a constant velocity. What is the net force acting on it?

An object travels around a circle of radius 6 m with speed 3π ms−1. Find the distance and displacement after 3 s.

A beam of light is falling on a glass plate at an angle 60∘. It is found that the reflected light is completely polarized. The angle of refraction when angle of incidence is 45∘ is

In case of hydrometer for heavier liquids

During night time, an area of low pressure is formed on which of the following?

Magnitude of force F experienced by a certain object moving with speed v is given by F = Kv3, where K is a constant. The dimensions of K are

36. A stone weighing 3 kg fall from top of tower of 100 m and buries itself 2 m deep in sand the time of penetration is ?

Masses of two bodies are made four times each. How should the distance between them be changed, so that the gravitational force between them is doubled?

Which of the following units is not a fundamental unit?

define the term retardation.give 2 examples of such motion.

The weight of a stone in air is 25 N and the weight of the stone when submerged in water is 20 N. What is the relative density of the stone?

A bus moving with a velocity of 60 km/h is brought to rest in 20 sec by applying the brake, find acceleration.

Look at the following figure and choose the correct statement regarding sound propagation in this case.

The wheel of a car is running at a speed of 50 m/s if the angular speed of the wheel is 500 rad/s then, the radius of the wheel is:

A kid pushes his toy of weight 100 grams along a distance of 5 m on the floor of his house by applying a force of magnitude 9.0 N. What is the energy that has to be put in by the kid for displacing the toy? Is there any change in potential energy possessed by the toy?

A wooden block of mass 20 kg has density 800 kg/m3. What could be the maximum mass that can be placed on the wooden block so that the block floats just below the water surface?

how to derive tension in loop kept in magnetic field is equal to RIB, where r is radius of loop ,I is current and B is magnetic field

What is the nature of image formed by concave mirror if magnification produced by mirror is +3.

If the radius of the earth shrinks by 1.5% (mass remaining same), Then the value of acceleration due to gravity changes by___.

30.If velocity v of a particle at a distance x from originis given as v=a2- x2 ÷ x2 hole root then it's acceleration isproportional to(1)X(2)(c)(D>

A screw gauge has leastcount of 0.01mm and there are 50 division in its circular scale the pitch of the screw gauge is

A single slit of width 0.14 mm is illuminated normally by monochromatic light and diffraction bands are observed on a screen 2 m away. If the centre of the second dark band is 1.6 cm from the middle of the central bright band, the wavelength of light used.

Which among the below statements is the correct statement for Ohm’s Law?

Two points have a potential difference of 10 V. After connecting a conductor with zero resistance between the points, the final potential at each point becomes 25 V. What could be their initial potentials?

A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? give reasons for your answer.

Force required change the momentum from 36km/hr to 90km/hr in a time interval of 5 seconds is

Name the three characteristics of sound.

Why is mante of earth so much hot? If Thousands of meteorite sun at the same time then sun will move away from its place or will stay there?

The Olympic high jump record of 2.45m is held by Cuba. If acceleration due to gravity on the earth was – 1msec2 and not -10msec2. Calculate the height to which the jumper would have jumped.