6277 + Interview Questions in Physics Page 61 InterviewSolution

3001.	Write detailed answers?a. Explain the difference between potential energy and kinetic energy.b. Derive the formula for the kinetic energy of an object of mass m, moving with velocity v.c. Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy.d. Determine the amount of work done when an object is displaced at an angle of 30o with respect to the direction of the applied force.e. If an object has 0 momentum, does it have kinetic energy? Explain your answer.f. Why is the work done on an object moving with uniform circular motion zero?
Answer» Write detailed answers? a. Explain the difference between potential energy and kinetic energy. b. Derive the formula for the kinetic energy of an object of mass m, moving with velocity v. c. Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy. d. Determine the amount of work done when an object is displaced at an angle of 30^o with respect to the direction of the applied force. e. If an object has 0 momentum, does it have kinetic energy? Explain your answer. f. Why is the work done on an object moving with uniform circular motion zero?

Discussion

3002.	What are the three precautions you should take during a thunderstorm?
Answer» What are the three precautions you should take during a thunderstorm?

Discussion

3003.	(1.) How will you help your neighbours in case cyclone approaches your village or town ? (2.) Suggest two methods to find out wind direction at a given place.
Answer» (1.) How will you help your neighbours in case cyclone approaches your village or town ? (2.) Suggest two methods to find out wind direction at a given place.

3003.

(1.) How will you help your neighbours in case cyclone approaches your village or town ? (2.) Suggest two methods to find out wind direction at a given place.

Answer»

(1.) How will you help your neighbours in case cyclone approaches your village or town ?

(2.) Suggest two methods to find out wind direction at a given place.

Discussion

3004.	A rubber sucker, when pressed on a surface sticks to it, because:
Answer» A rubber sucker, when pressed on a surface sticks to it, because:

Discussion

3005.	It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw a lightning. He started his stopwatch. He found that after 22 seconds of lightning its roaring was heard. Calculate the distance of the clouds which caused this lightning. Given, Speed of light = 3 x 108 ms and Speed of sound = 340ms.
Answer» It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw a lightning. He started his stopwatch. He found that after 22 seconds of lightning its roaring was heard. Calculate the distance of the clouds which caused this lightning. Given, Speed of light = 3 x $10^{8}$ $\frac{m}{s}$ and Speed of sound = $340 \frac{m}{s}$ .

Discussion

3006.	Salts of A (atomic mass 15), B (atomic mass 27) and C (atomic mass 48) were electrolyzed using the same amount of charge. It was found that when 4.5 g of A was deposited, the mass of B and C deposited were 2.7 g and 9.6 g. The valencies of A, B and C respectively.
Answer» Salts of $A$ (atomic mass $15$ ), $B$ (atomic mass $27$ ) and $C$ (atomic mass $48$ ) were electrolyzed using the same amount of charge. It was found that when $4.5 g$ of $A$ was deposited, the mass of $B$ and $C$ deposited were $2.7 g$ and $9.6 g$ . The valencies of $A$ , $B$ and $C$ respectively.

Discussion

3007.	A fused bulb does not glow. Why?
Answer» A fused bulb does not glow. Why?

Discussion

3008.	Time taken for 60 W electric bulb to consume 3000 J energy is ___seconds.
Answer» Time taken for 60 W electric bulb to consume 3000 J energy is ___seconds.

Discussion

3009.	what is the meaning of aperture of convex sperical mirror?
Answer» what is the meaning of aperture of convex sperical mirror?

Discussion

3010.	Two wires are made up of two different materials whose specific resistance are in the ratio 2:3 length 3:4 and area for 4:5 ratio of the resistance is
Answer» Two wires are made up of two different materials whose specific resistance are in the ratio 2:3 length 3:4 and area for 4:5 ratio of the resistance is

Discussion

3011.	Magnets can lose their property if they are:
Answer» Magnets can lose their property if they are:

Discussion

3012.	Pressure can be measured in terms of
Answer» Pressure can be measured in terms of

Discussion

3013.	Does the density of the blanket of air that surrounds us get thicker or thinner as we go up?
Answer» Does the density of the blanket of air that surrounds us get thicker or thinner as we go up?

Discussion

3014.	Two wires that are made up of two different materials, whose specific resistances are in the ratio 3:2, length 4:3 and area 5:4. What is the ratio of their resistances?
Answer» Two wires that are made up of two different materials, whose specific resistances are in the ratio 3:2, length 4:3 and area 5:4. What is the ratio of their resistances?

Discussion

3015.	Question 5When we change feeble sound to loud sound we increase its(a) frequency(b) amplitude(c) velocity(d) wavelength
Answer» Question 5 When we change feeble sound to loud sound we increase its (a) frequency (b) amplitude (c) velocity (d) wavelength

Discussion

3016.	What is electroplating, and how is the electroplating of the copper on an object done?
Answer» What is electroplating, and how is the electroplating of the copper on an object done?

Discussion

3017.	A platform of the following dimensions is to be constructed-length 24 m, breadth 6 m and height 0.4 m. How many bricks of dimensions 25 cm, 16 cm and 10 cm are required to construct the platform.
Answer» A platform of the following dimensions is to be constructed-length 24 m, breadth 6 m and height 0.4 m. How many bricks of dimensions 25 cm, 16 cm and 10 cm are required to construct the platform.

Discussion

3018.	The term 'temperature' can be viewed as:-
Answer» The term 'temperature' can be viewed as:-

Discussion

3019.	radiation power from a black body at temperature 1500 Kelvin at a distance 1 metre is 2 w if the temperature of source is increased to 3000 Kelvin the power of radiation received at 2 metre will be
Answer» radiation power from a black body at temperature 1500 Kelvin at a distance 1 metre is 2 w if the temperature of source is increased to 3000 Kelvin the power of radiation received at 2 metre will be

Discussion

3020.	a particle moves in a straight line and its speed depends on time as v=\|2t-3\|. dx represents the distance travelled of the paeticle then find the displacement of yhe particle in 5s.
Answer» a particle moves in a straight line and its speed depends on time as v=\|2t-3\|. dx represents the distance travelled of the paeticle then find the displacement of yhe particle in 5s.

Discussion

3021.	Question 9 An iron ball at 40∘C is dropped in a mug containing water at 40∘C. The heat will (a) flow from iron ball to water. (b) not flow from iron ball to water or from water to iron ball. (c) flow from water to iron ball. (d) increase the temperature of both.
Answer» Question 9 An iron ball at $40^{\circ} C$ is dropped in a mug containing water at $40^{\circ} C$ . The heat will (a) flow from iron ball to water. (b) not flow from iron ball to water or from water to iron ball. (c) flow from water to iron ball. (d) increase the temperature of both.

Discussion

3022.	Ice and water are in equilibrium , on increasing the pressure of system , melting point of ice will decrease Explain the a above statement by using le-chatelier's principal in 'detail' .
Answer» Ice and water are in equilibrium , on increasing the pressure of system , melting point of ice will decrease Explain the a above statement by using le-chatelier's principal in 'detail' .

Discussion

3023.	The minimum coulombian force between two charges separated by 1ANGSTROM is ?
Answer» The minimum coulombian force between two charges separated by 1ANGSTROM is ?

Discussion

3024.	Which type of mirror is used in the torches used at homes or by dentists?
Answer» Which type of mirror is used in the torches used at homes or by dentists?

Discussion

3025.	a block suspended from a vertical spring is in equilibrium. show that the extension in the spring equals the length of an equivalent simple pendulum,i.e.,a pendulum having frequency same as that of the block.
Answer» a block suspended from a vertical spring is in equilibrium. show that the extension in the spring equals the length of an equivalent simple pendulum,i.e.,a pendulum having frequency same as that of the block.

Discussion

3026.	The length of an elastic string is a metre when the longitudinal tension is 4 N and b metre when the longitudinal tension is 5 N. The length of the string in metre when the longitudinal tension is 9 N is
Answer» The length of an elastic string is a metre when the longitudinal tension is 4 N and b metre when the longitudinal tension is 5 N. The length of the string in metre when the longitudinal tension is 9 N is

Discussion

3027.	A+B→ C+D if initially of A and B are both are taken in equal amount but a equilibrium concentration of D will be twice of that of A then what will be the equilibrium cons†an t of reactio
Answer» A+B→ C+D if initially of A and B are both are taken in equal amount but a equilibrium concentration of D will be twice of that of A then what will be the equilibrium cons†an t of reactio

Discussion

3028.	What amount of heat will be generated in a coil of resistance R due to a charge q is passing through it if the current in the coil decreases to zero uniformly during a time interval (Δt)
Answer» What amount of heat will be generated in a coil of resistance R due to a charge q is passing through it if the current in the coil decreases to zero uniformly during a time interval (Δt)

Discussion

3029.	How does the kink near the bulb in a clinical thermometer help in measuring body temperature accurately?
Answer» How does the kink near the bulb in a clinical thermometer help in measuring body temperature accurately?

Discussion

3030.	Question 35In the coastal area, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.
Answer» Question 35 In the coastal area, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.

Discussion

3031.	What is absolute value?
Answer» What is absolute value?

Discussion

3032.	1 km=––––– m.
Answer» $1 k m = - --- - m$ .

Discussion

3033.	Find the radian measure corresponding to each of the following degree measure.-37°30'
Answer» Find the radian measure corresponding to each of the following degree measure. -37°30'

Discussion

3034.	Which of the following combinations of college-student-specialisation is correct?
Answer» Which of the following combinations of college-student-specialisation is correct?

Discussion

3035.	Which of the following is/are the luminous object(s)?
Answer» Which of the following is/are the luminous object(s)?

Discussion

3036.	A satellite gets unstable in its orbit and starts to fall towards a planet and heating up. If the satellite had a potential energy of 5000 joules initially and by the time it reaches the surface of the planet it attains a kinetic energy of 2500 joules the how much energy is converted to heat?
Answer» A satellite gets unstable in its orbit and starts to fall towards a planet and heating up. If the satellite had a potential energy of 5000 joules initially and by the time it reaches the surface of the planet it attains a kinetic energy of 2500 joules the how much energy is converted to heat?

Discussion

3037.	A plate in equilibrium is subjected to uniform stresses along its edges with magnitude σxx=30 MPa and σyy=50 MPa as shown in figure.The Young's modulus of the material is 2×1011 N/m2 and the Poisson's ratio is 0.3. If σzz is negligibly small and assumed to be zero, then the strain ϵzz is
Answer» A plate in equilibrium is subjected to uniform stresses along its edges with magnitude $σ_{x x} = 30 M P a$ and $σ_{y y} = 50 M P a$ as shown in figure. The Young's modulus of the material is $2 \times 10^{11} N / m^{2}$ and the Poisson's ratio is $0.3$ . If $σ_{z z}$ is negligibly small and assumed to be zero, then the strain $ϵ_{z z}$ is

Discussion

3038.	For a particular thermometer, the scale of the reading is divided into 20 equal parts, where each part is equal to one degree and again there are 10 equal divisions between them. What is the smallest measurement that you can take using this thermometer?
Answer» For a particular thermometer, the scale of the reading is divided into 20 equal parts, where each part is equal to one degree and again there are 10 equal divisions between them. What is the smallest measurement that you can take using this thermometer?

Discussion

3039.	Difference between gas pressure and atmospheric pressure
Answer» Difference between gas pressure and atmospheric pressure

Discussion

3040.	86. The total number of electrons present in 96500 coulomb of electricity is
Answer» 86. The total number of electrons present in 96500 coulomb of electricity is

Discussion

3041.	How does heat travel differently in space than on Earth?
Answer» How does heat travel differently in space than on Earth?

Discussion

3042.	Which of the following material is not a good conductor of electricity?
Answer» Which of the following material is not a good conductor of electricity?

Discussion

3043.	Option 25Why does a magnetic compass needle pointing north and south in the absence of a nearby magnet gets deflected when a bar magnet or a current carrying loop is brought near to it. Describe some salient features of magnetic lines of field concept.
Answer» Option 25 Why does a magnetic compass needle pointing north and south in the absence of a nearby magnet gets deflected when a bar magnet or a current carrying loop is brought near to it. Describe some salient features of magnetic lines of field concept.

Discussion

3044.	The radii of two cylinders are in the ratio 2 : 3 and their heights are in the ratio of 5 : 3. The ratio of their volumes is _________.
Answer» The radii of two cylinders are in the ratio 2 : 3 and their heights are in the ratio of 5 : 3. The ratio of their volumes is _________.

Discussion

3045.	Which of the following is not a good option in the generation of electricity in the hydroelectric power plants?
Answer» Which of the following is not a good option in the generation of electricity in the hydroelectric power plants?

Discussion

3046.	If an object moves with a speed of 10 msec towards a plane mirror. Find out the speed of the image with respect to the mirror?
Answer» If an object moves with a speed of 10 $\frac{m}{s e c}$ towards a plane mirror. Find out the speed of the image with respect to the mirror?

Discussion

3047.	quantization charge explain in detail
Answer» quantization charge explain in detail

Discussion

3048.	For 2 mirrors inclined atvan angle( theta ) is possible to have more than one overlapping images ? If yes , then in what condition. If no , then why?
Answer» For 2 mirrors inclined atvan angle( theta ) is possible to have more than one overlapping images ? If yes , then in what condition. If no , then why?

Discussion

3049.	18. The temperature of a perfect black body is727^° C and its area is 0.1 m2. If stefan's constantis 5.67 x 10-8 watt/m2-k4, then heat radiated by it in 1 minute is a)8100 cal b)81000 cal c)810 cal d) 81 ca
Answer» 18. The temperature of a perfect black body is727^° C and its area is 0.1 m2. If stefan's constantis 5.67 x 10-8 watt/m2-k4, then heat radiated by it in 1 minute is a)8100 cal b)81000 cal c)810 cal d) 81 ca

Discussion

3050.	Power consumed in bulb of 1000w/220v when connected to 110v mains=
Answer» Power consumed in bulb of 1000w/220v when connected to 110v mains=

Discussion

Explore topic-wise InterviewSolutions in .

What are the three precautions you should take during a thunderstorm?

(1.) How will you help your neighbours in case cyclone approaches your village or town ? (2.) Suggest two methods to find out wind direction at a given place.

A rubber sucker, when pressed on a surface sticks to it, because:

Salts of A (atomic mass 15), B (atomic mass 27) and C (atomic mass 48) were electrolyzed using the same amount of charge. It was found that when 4.5 g of A was deposited, the mass of B and C deposited were 2.7 g and 9.6 g. The valencies of A, B and C respectively.

A fused bulb does not glow. Why?

Time taken for 60 W electric bulb to consume 3000 J energy is ___seconds.

what is the meaning of aperture of convex sperical mirror?

Two wires are made up of two different materials whose specific resistance are in the ratio 2:3 length 3:4 and area for 4:5 ratio of the resistance is

Magnets can lose their property if they are:

Pressure can be measured in terms of

Does the density of the blanket of air that surrounds us get thicker or thinner as we go up?

Two wires that are made up of two different materials, whose specific resistances are in the ratio 3:2, length 4:3 and area 5:4. What is the ratio of their resistances?

Question 5When we change feeble sound to loud sound we increase its(a) frequency(b) amplitude(c) velocity(d) wavelength

What is electroplating, and how is the electroplating of the copper on an object done?

A platform of the following dimensions is to be constructed-length 24 m, breadth 6 m and height 0.4 m. How many bricks of dimensions 25 cm, 16 cm and 10 cm are required to construct the platform.

The term 'temperature' can be viewed as:-

radiation power from a black body at temperature 1500 Kelvin at a distance 1 metre is 2 w if the temperature of source is increased to 3000 Kelvin the power of radiation received at 2 metre will be

a particle moves in a straight line and its speed depends on time as v=|2t-3|. dx represents the distance travelled of the paeticle then find the displacement of yhe particle in 5s.

Question 9 An iron ball at 40∘C is dropped in a mug containing water at 40∘C. The heat will (a) flow from iron ball to water. (b) not flow from iron ball to water or from water to iron ball. (c) flow from water to iron ball. (d) increase the temperature of both.

Ice and water are in equilibrium , on increasing the pressure of system , melting point of ice will decrease Explain the a above statement by using le-chatelier's principal in 'detail' .

The minimum coulombian force between two charges separated by 1ANGSTROM is ?

Which type of mirror is used in the torches used at homes or by dentists?

a block suspended from a vertical spring is in equilibrium. show that the extension in the spring equals the length of an equivalent simple pendulum,i.e.,a pendulum having frequency same as that of the block.

The length of an elastic string is a metre when the longitudinal tension is 4 N and b metre when the longitudinal tension is 5 N. The length of the string in metre when the longitudinal tension is 9 N is

A+B→ C+D if initially of A and B are both are taken in equal amount but a equilibrium concentration of D will be twice of that of A then what will be the equilibrium cons†an t of reactio

What amount of heat will be generated in a coil of resistance R due to a charge q is passing through it if the current in the coil decreases to zero uniformly during a time interval (Δt)

How does the kink near the bulb in a clinical thermometer help in measuring body temperature accurately?

Question 35In the coastal area, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.

What is absolute value?

1 km=––––– m.

Find the radian measure corresponding to each of the following degree measure.-37°30'

Which of the following combinations of college-student-specialisation is correct?

Which of the following is/are the luminous object(s)?

A satellite gets unstable in its orbit and starts to fall towards a planet and heating up. If the satellite had a potential energy of 5000 joules initially and by the time it reaches the surface of the planet it attains a kinetic energy of 2500 joules the how much energy is converted to heat?

A plate in equilibrium is subjected to uniform stresses along its edges with magnitude σxx=30 MPa and σyy=50 MPa as shown in figure.The Young's modulus of the material is 2×1011 N/m2 and the Poisson's ratio is 0.3. If σzz is negligibly small and assumed to be zero, then the strain ϵzz is

For a particular thermometer, the scale of the reading is divided into 20 equal parts, where each part is equal to one degree and again there are 10 equal divisions between them. What is the smallest measurement that you can take using this thermometer?

Difference between gas pressure and atmospheric pressure

86. The total number of electrons present in 96500 coulomb of electricity is

How does heat travel differently in space than on Earth?

Which of the following material is not a good conductor of electricity?

Option 25Why does a magnetic compass needle pointing north and south in the absence of a nearby magnet gets deflected when a bar magnet or a current carrying loop is brought near to it. Describe some salient features of magnetic lines of field concept.

The radii of two cylinders are in the ratio 2 : 3 and their heights are in the ratio of 5 : 3. The ratio of their volumes is _________.

Which of the following is not a good option in the generation of electricity in the hydroelectric power plants?

If an object moves with a speed of 10 msec towards a plane mirror. Find out the speed of the image with respect to the mirror?

quantization charge explain in detail

For 2 mirrors inclined atvan angle( theta ) is possible to have more than one overlapping images ? If yes , then in what condition. If no , then why?

18. The temperature of a perfect black body is727^° C and its area is 0.1 m2. If stefan's constantis 5.67 x 10-8 watt/m2-k4, then heat radiated by it in 1 minute is a)8100 cal b)81000 cal c)810 cal d) 81 ca

Power consumed in bulb of 1000w/220v when connected to 110v mains=