13232 + Interview Questions in Physics

1.	A boy is pulling a car by supplying a constant force of 8N on a straight path of 20m. On a round about of 10m diameter he forgets the path and takes 1.5 turns and then Continues on the straight path for another 20m. Find the net work done by the boy on cart
Answer» A boy is pulling a car by supplying a constant force of 8N on a straight path of 20m. On a round about of 10m diameter he forgets the path and takes 1.5 turns and then Continues on the straight path for another 20m. Find the net work done by the boy on cart

Discussion

2.	In the given circuit, switch is closed at t=0. The time after which the current becomes 2.5 μA is given by (Takeln2=0.69)
Answer» In the given circuit, switch is closed at $t = 0$ . The time after which the current becomes $2.5 μ A$ is given by $(Take ln 2 = 0.69)$

Discussion

3.	(a) What is meant by 'reflection of sound'? What type of surfaces are the best for reflecting sound?(b) Name any two objects which are good reflectors of sound.(c) State the laws of reflection sound.
Answer» (a) What is meant by 'reflection of sound'? What type of surfaces are the best for reflecting sound? (b) Name any two objects which are good reflectors of sound. (c) State the laws of reflection sound.

Discussion

4.	For making a strong electromagnet, the material of the core should be.
Answer» For making a strong electromagnet, the material of the core should be.

Discussion

5.	7.a projectilr thrown with a speed u=20m/s at an angle 30 degree with the horizontal from the top of a building 40m high. the horizontal range of the projectile is 1 20 root 2 2 40 root 3 3 40m 4 20m
Answer» 7.a projectilr thrown with a speed u=20m/s at an angle 30 degree with the horizontal from the top of a building 40m high. the horizontal range of the projectile is 1 20 root 2 2 40 root 3 3 40m 4 20m

Discussion

6.	Volume of an object is 20 cm3 and the mass in 50 g. Density of water is 1 g cm-3. Will the object float on water or sink in water?
Answer» Volume of an object is 20 cm³ and the mass in 50 g. Density of water is 1 g cm^{$-$ 3}. Will the object float on water or sink in water?

Discussion

7.	Consider a system with the one-line diagram shown in below figure. The three phase transformer name plate ratings are listed. The transformer reactances are given in percentage, (10% = 0.1 p.u.). The transmission line and load impedances are in actual ohms. The generator terminal voltage (magnitude) is 13.2 kV (line-line) then the load voltage is _________ kV.58.93
Answer» Consider a system with the one-line diagram shown in below figure. The three phase transformer name plate ratings are listed. The transformer reactances are given in percentage, (10% = 0.1 p.u.). The transmission line and load impedances are in actual ohms. The generator terminal voltage (magnitude) is 13.2 kV (line-line) then the load voltage is _________ kV. 58.93

Discussion

8.	It is proposed to use the nuclear fusion reaction 1H2+ 1H2→ 2He4 in a nuclear reactor of 200 MW rating. If 25% of energy from the above reaction is used in the reactor. It is found that nearly 12x grams of deuterium will be needed per day. The value of x is (integer only)[Take, mass of 1H2=2.0141 amu,mass of 2He4=4.0026 amu,1amu c2=931.5 MeV]
Answer» It is proposed to use the nuclear fusion reaction $_{1} H^{2} +_{1} H^{2} \to_{2} {He}^{4}$ in a nuclear reactor of $200 MW$ rating. If $25 %$ of energy from the above reaction is used in the reactor. It is found that nearly $12 x$ grams of deuterium will be needed per day. The value of $x$ is (integer only) $[Take, mass of_{1} H^{2} = 2.0141 amu, mass of_{2} {He}^{4} = 4.0026 amu, 1 amu c^{2} = 931.5 MeV]$

Discussion

9.	The two planets with radii R1 and R2 have densities ρ1 and ρ2, and atmospheric pressures P1 and P2 respectively. Find the ratio of masses of their atmosphere. [neglecting the variation of g and ρ within the limits of atmosphere and height of atmosphere h<<R]
Answer» The two planets with radii $R_{1}$ and $R_{2}$ have densities $ρ_{1}$ and $ρ_{2}$ , and atmospheric pressures $P_{1}$ and $P_{2}$ respectively. Find the ratio of masses of their atmosphere. [neglecting the variation of $g$ and $ρ$ within the limits of atmosphere and height of atmosphere $h << R$ ]

Discussion

10.	96. How the graph is plotted between g( acceleration due to gravity) and r(distance of object from centre of earth).
Answer» 96. How the graph is plotted between g( acceleration due to gravity) and r(distance of object from centre of earth).

Discussion

11.	(a) What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ? (b) Name any two objects which are good reflectors of sound. (c) State the laws of reflection of sound.
Answer» (a) What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ? (b) Name any two objects which are good reflectors of sound. (c) State the laws of reflection of sound.

11.

(a) What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ? (b) Name any two objects which are good reflectors of sound. (c) State the laws of reflection of sound.

Answer»

(a) What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?

(b) Name any two objects which are good reflectors of sound.

(c) State the laws of reflection of sound.

Discussion

12.	The thickness of a glass sheet measured using a screw gauge is given by 1.52 mm, 1.56 men. 1 mm respectively.Find the thickness of the glass sheet,mean absolute error and percentage
Answer» The thickness of a glass sheet measured using a screw gauge is given by 1.52 mm, 1.56 men. 1 mm respectively.Find the thickness of the glass sheet,mean absolute error and percentage

Discussion

13.	of which ONSITwo trains, each 50 m long. one is at rest and another is travelling with velocity 25 m/s The time ocrossing is(A) 2s(B)4(C) 2(D) 5s
Answer» of which ONSITwo trains, each 50 m long. one is at rest and another is travelling with velocity 25 m/s The time ocrossing is(A) 2s(B)4(C) 2(D) 5s

Discussion

14.	Name the nerve which carries electrical impulses from the cochlea of the ear to the brain.
Answer» Name the nerve which carries electrical impulses from the cochlea of the ear to the brain.

Discussion

15.	hardworking, arrived, starve, slammed
Answer» hardworking, arrived, starve, slammed

Discussion

16.	Which one is heavier on the surface of Earth: 1 m3 cotton or 1m3 of Iron?{provided: ρiron>ρcotton}
Answer» Which one is heavier on the surface of Earth: 1 m³ cotton or 1m³ of Iron?{provided: ρ_iron>ρ_cotton}

Discussion

17.	a ball is thrown vertically downwards from a height of 20m with an intial velocity {v^2}_{0 }.it collides with the ground loses 50% of its energy in collision and rebounds to the same heigh. the inital velocity v_0 (g=10m/s) 1)10m/s 2)14m/s 3)20m/s 4)28m/s
Answer» a ball is thrown vertically downwards from a height of 20m with an intial velocity {v^2}_{0 }.it collides with the ground loses 50% of its energy in collision and rebounds to the same heigh. the inital velocity v_0 (g=10m/s) 1)10m/s 2)14m/s 3)20m/s 4)28m/s

Discussion

18.	I want to know that why we use conservation of momentum
Answer» I want to know that why we use conservation of momentum

Discussion

19.	From an inclined plane two particles A' and 'B' are projected with same speed at the same angle betta with the horizontal; particle 'A' down the inclined plane and particle 'B' up the inclined plane. The ratio of the times of flight of 'A' and 'B' is cot theta,where 'theta' is the angle at which B' is projected measured from inclined plane. Find the angle B.(1) 90^°(2)60(3) 30^° (4) 45^°
Answer» From an inclined plane two particles A' and 'B' are projected with same speed at the same angle betta with the horizontal; particle 'A' down the inclined plane and particle 'B' up the inclined plane. The ratio of the times of flight of 'A' and 'B' is cot theta,where 'theta' is the angle at which B' is projected measured from inclined plane. Find the angle B.(1) 90^°(2)60(3) 30^° (4) 45^°

Discussion

20.	A body is projected at an angle from horizontal and it just touches the height y at a distance x from point of projection. Show that the velocity of projection is given as- g(2y+x2/2y).
Answer» A body is projected at an angle from horizontal and it just touches the height y at a distance x from point of projection. Show that the velocity of projection is given as- g(2y+x2/2y).

Discussion

21.	A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that the end closer to the pole is 20 cm away from it. Find the length of the image.
Answer» A rod of length $10 cm$ lies along the principal axis of a concave mirror of focal length $10 cm$ in such a way that the end closer to the pole is $20 cm$ away from it. Find the length of the image.

Discussion

22.	62. A particle is moving in a straight line with uniform acceleration −5ms−2 and initial velocity 12.5 m/s.Distance travelled by it in 3rd second is1) 1 m2) Zero3) 1.25 m4) 2 m
Answer» 62. A particle is moving in a straight line with uniform acceleration $- 5 m s^{- 2}$ and initial velocity 12.5 m/s.Distance travelled by it in 3rd second is 1) 1 m 2) Zero 3) 1.25 m 4) 2 m

22.

62. A particle is moving in a straight line with uniform acceleration −5ms−2 and initial velocity 12.5 m/s.Distance travelled by it in 3rd second is1) 1 m2) Zero3) 1.25 m4) 2 m

Answer»

62. A particle is moving in a straight line with uniform acceleration $- 5 m s^{- 2}$ and initial velocity 12.5 m/s.Distance travelled by it in 3rd second is

1) 1 m

2) Zero

3) 1.25 m

4) 2 m

Discussion

23.	Differentiate between:1. Mass and weight2. Universal gravitational constant and gravitational acceleration of earth
Answer» Differentiate between: 1. Mass and weight 2. Universal gravitational constant and gravitational acceleration of earth

23.

Differentiate between:1. Mass and weight2. Universal gravitational constant and gravitational acceleration of earth

Answer»

Differentiate between:

1. Mass and weight

2. Universal gravitational constant and gravitational acceleration of earth

Discussion

24.	name the force that keeps the object moving in a circular path with constant acceleration.
Answer» name the force that keeps the object moving in a circular path with constant acceleration.

Discussion

25.	100.What is right hand thumb rule and how to identify the direction of force with it .
Answer» 100.What is right hand thumb rule and how to identify the direction of force with it .

Discussion

26.	State whether the speed is a scalar or a vector quantity. Give a reason for your choice.
Answer» State whether the speed is a scalar or a vector quantity. Give a reason for your choice.

Discussion

27.	When 4 kg of this solid is immersed in water, the buoyant force experienced by it is (given g =9.8 ms^- ) (A) 4.5g (B) 4g (C) 5g (D) 10g
Answer» When 4 kg of this solid is immersed in water, the buoyant force experienced by it is (given g =9.8 ms^- ) (A) 4.5g (B) 4g (C) 5g (D) 10g

Discussion

28.	Find the value g if the mass of the planet is 1.898*10^27 kg and the radius of the planet is 69911km and compare with the earth gravitational force
Answer» Find the value g if the mass of the planet is 1.898*10^27 kg and the radius of the planet is 69911km and compare with the earth gravitational force

Discussion

29.	A body completes one revolution of a circular track of radius 4m in 2s . What is the average velocity of the body.
Answer» A body completes one revolution of a circular track of radius 4m in 2s . What is the average velocity of the body.

Discussion

30.	List out the physical quantities on which the gravitational force between objects depends. [2 MARKS]
Answer» List out the physical quantities on which the gravitational force between objects depends. [2 MARKS]

Discussion

31.	102.A particle of rest mass m is travelling so that its total energy is twice its rest mass energy. It collides with another stationary particle of rest mass m to form a new particle. What is the rest mass of the new particle?
Answer» 102.A particle of rest mass m is travelling so that its total energy is twice its rest mass energy. It collides with another stationary particle of rest mass m to form a new particle. What is the rest mass of the new particle?

Discussion

32.	While performing an experiment on verifying the laws of reflection of sound, a student is to choose between(i) a narrow or a wide tube, and(ii) a strong or a faint source of the sound.The observed experimental difference, between the values of angle of incidence and angle of reflection, is likely to be minimum when he chooses a :(1) narrow tube and a faint source(2) wide tube and a faint source(3) narrow tube and a strong source (4) wide tube and a strong source
Answer» While performing an experiment on verifying the laws of reflection of sound, a student is to choose between (i) a narrow or a wide tube, and (ii) a strong or a faint source of the sound. The observed experimental difference, between the values of angle of incidence and angle of reflection, is likely to be minimum when he chooses a : (1) narrow tube and a faint source (2) wide tube and a faint source (3) narrow tube and a strong source (4) wide tube and a strong source

Discussion

33.	Name the physical quantities which are measured in the following units : (a) u (b) ly (c) ns (d) nm
Answer» Name the physical quantities which are measured in the following units : (a) u (b) ly (c) ns (d) nm

33.

Name the physical quantities which are measured in the following units : (a) u (b) ly (c) ns (d) nm

Answer»

Name the physical quantities which are measured in the following units :

(a) u (b) ly (c) ns (d) nm

Discussion

34.	ntA body weighs x g in air, y g in liquid and z g in water.The ratio of relative density of liquid and the body isn
Answer» ntA body weighs x g in air, y g in liquid and z g in water.The ratio of relative density of liquid and the body isn

Discussion

35.	14.Two tunning forks A and B of frequencies 200hz and 400 have are vibrated simultaneously. Then the ratio of time taken by the sound produced by A and B travel 660m and 990m respectively in air is ---------( velo. = 330 m/s)
Answer» 14.Two tunning forks A and B of frequencies 200hz and 400 have are vibrated simultaneously. Then the ratio of time taken by the sound produced by A and B travel 660m and 990m respectively in air is ---------( velo. = 330 m/s)

Discussion

36.	what is the motion of an object if its dis†an ce is parallel to time axis
Answer» what is the motion of an object if its dis†an ce is parallel to time axis

Discussion

37.	The potential of the Daniel cell, Zn\|(ZnSO4)\|∣(CuSO4∣Cu was reported by Buckbee, Surdzial and Metz as E∘=1.1028-0.641×10-3T + 0.72×10-5T2, where T is the temperature in degree celcius, Calcualte ΔS∘0 for the cell reaction at 25
Answer» The potential of the Daniel cell, Zn\|(ZnSO4)\|∣(CuSO4∣Cu was reported by Buckbee, Surdzial and Metz as E∘=1.1028-0.641×10-3T + 0.72×10-5T2, where T is the temperature in degree celcius, Calcualte ΔS∘0 for the cell reaction at 25

Discussion

38.	Indeed there had been a distant for some time, although I had paid no attention to it. Now I started listening and I thought it sounded like the characteristic noise of jet airplanes constantly landing and taking off. Therefore rumbling means ____________________________.
Answer» Indeed there had been a distant for some time, although I had paid no attention to it. Now I started listening and I thought it sounded like the characteristic noise of jet airplanes constantly landing and taking off. Therefore rumbling means ____________________________.

38.

Indeed there had been a distant for some time, although I had paid no attention to it. Now I started listening and I thought it sounded like the characteristic noise of jet airplanes constantly landing and taking off. Therefore rumbling means ____________________________.

Answer»

Indeed
there had been a distant for some time, although I had paid no

attention
to it. Now I started listening and I thought it sounded like the
characteristic noise of jet airplanes constantly landing and taking
off.

Therefore
rumbling means ____________________________.

Discussion

39.	Express 15 m s−1 in kmh−1.
Answer» Express $15 m s^{- 1}$ in km $h^{- 1}$ .

Discussion

40.	117. two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz . The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats per second when both the wires oscillate together would be?
Answer» 117. two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz . The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats per second when both the wires oscillate together would be?

Discussion

41.	The earth is acted upon by gravitational force of attraction due to the sun. Then why does the earth not fall towards the sun?
Answer» The earth is acted upon by gravitational force of attraction due to the sun. Then why does the earth not fall towards the sun?

Discussion

42.	What is the value of acceleration due to gravity of the Earth?(Given mass of the Earth is 6×1024 kg and radius of the Earth is 6.4× 106 m).
Answer» What is the value of acceleration due to gravity of the Earth? (Given mass of the Earth is $6 \times 10^{24} k g$ and radius of the Earth is $6.4 \times$ $10^{6} m$ ).

Discussion

43.	A soil has dry unit weight of 15.5 kN/m2, specific gravity of 2.65 and degree of saturation of 72%. Considering the unit weight of water as 10 kN/m3 , the water content of the soil (in % round off to two decimal places) is 19.26
Answer» A soil has dry unit weight of $15.5 k N / m^{2}$ , specific gravity of 2.65 and degree of saturation of 72%. Considering the unit weight of water as $10 k N / m^{3}$ , the water content of the soil (in % round off to two decimal places) is 19.26

Discussion

44.	In a thermonuclear reaction, 10−3 kg of hydrogen is converted into 0.99×10−3 kg of helium. If the efficiency of the generator is 50%, the electrical energy generated in kWh is
Answer» In a thermonuclear reaction, $10^{- 3} kg$ of $hydrogen$ is converted into $0.99 \times 10^{- 3} kg$ of $helium$ . If the efficiency of the generator is $50 %$ , the electrical energy generated in $kWh$ is

Discussion

45.	When calculating electric field at axial position due to uniform ring, why don't we use the relation linear density = dq/dl = Q/2piR?
Answer» When calculating electric field at axial position due to uniform ring, why don't we use the relation linear density = dq/dl = Q/2piR?

Discussion

46.	A solid block of material density 6000 kg/m3 weighs 10 kg wt. in air. When it is immersed completely into a liquid, it weighs 6 kg wt. What is the density of the liquid?
Answer» A solid block of material density 6000 $k g / m^{3}$ weighs 10 kg wt. in air. When it is immersed completely into a liquid, it weighs 6 kg wt. What is the density of the liquid?

Discussion

47.	107.A body A floats with 50% of volume submerged in a liquid B and 75% of its volume submerged in a liquid C. What is the ratio of the densities of A, B and C? What fraction of the body A will be seen above the surface of a homogenous mixture of equal volumes of the liquids B and C?
Answer» 107.A body A floats with 50% of volume submerged in a liquid B and 75% of its volume submerged in a liquid C. What is the ratio of the densities of A, B and C? What fraction of the body A will be seen above the surface of a homogenous mixture of equal volumes of the liquids B and C?

Discussion

48.	Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy? (a) Geothermal energy (b) Wind energy (c) Nuclear energy (d) Bio-mass
Answer» Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy? (a) Geothermal energy (b) Wind energy (c) Nuclear energy (d) Bio-mass

Discussion

49.	Differentiate between acceleration and velocity
Answer» Differentiate between acceleration and velocity

Discussion

50.

i. Pick the rhyming words from this box and pair them in the spaces below. The first one has been done for you. found cold took sand mummy look hand sound bold tummy 1. found 2. 3. 4. 5. sound ii. Fill in the blanks with the opposite word choosing from the box below. The first one is done for you. hot false short straight drop soft went small gave outside bitter lost found lost took hard big inside came pick cold true sweet curly tall ____

Answer» i. Pick the rhyming words from this box and pair them in the spaces below. The first one has been done for you.

found	cold	took	sand	mummy
look	hand	sound	bold	tummy

1. found	2. ______	3. ______	4. ______	5. ______
sound	______	______	______	______

ii. Fill in the blanks with the opposite word choosing from the box below. The first one is done for you.

hot	false	short	straight	drop	soft
went	small	gave	outside	bitter	lost

found	lost	took	____________
hard	____________	big	____________
inside	____________	came	____________
pick	____________	cold	____________
true	____________	sweet	____________
curly	____________	tall	____________

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A boy is pulling a car by supplying a constant force of 8N on a straight path of 20m. On a round about of 10m diameter he forgets the path and takes 1.5 turns and then Continues on the straight path for another 20m. Find the net work done by the boy on cart

In the given circuit, switch is closed at t=0. The time after which the current becomes 2.5 μA is given by (Takeln2=0.69)

(a) What is meant by 'reflection of sound'? What type of surfaces are the best for reflecting sound?(b) Name any two objects which are good reflectors of sound.(c) State the laws of reflection sound.

For making a strong electromagnet, the material of the core should be.

7.a projectilr thrown with a speed u=20m/s at an angle 30 degree with the horizontal from the top of a building 40m high. the horizontal range of the projectile is 1 20 root 2 2 40 root 3 3 40m 4 20m

Volume of an object is 20 cm3 and the mass in 50 g. Density of water is 1 g cm-3. Will the object float on water or sink in water?

The two planets with radii R1 and R2 have densities ρ1 and ρ2, and atmospheric pressures P1 and P2 respectively. Find the ratio of masses of their atmosphere. [neglecting the variation of g and ρ within the limits of atmosphere and height of atmosphere h&lt;&lt;R]

96. How the graph is plotted between g( acceleration due to gravity) and r(distance of object from centre of earth).

(a) What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ? (b) Name any two objects which are good reflectors of sound. (c) State the laws of reflection of sound.

The thickness of a glass sheet measured using a screw gauge is given by 1.52 mm, 1.56 men. 1 mm respectively.Find the thickness of the glass sheet,mean absolute error and percentage

of which ONSITwo trains, each 50 m long. one is at rest and another is travelling with velocity 25 m/s The time ocrossing is(A) 2s(B)4(C) 2(D) 5s

Name the nerve which carries electrical impulses from the cochlea of the ear to the brain.

hardworking, arrived, starve, slammed

Which one is heavier on the surface of Earth: 1 m3 cotton or 1m3 of Iron?{provided: ρiron&gt;ρcotton}

a ball is thrown vertically downwards from a height of 20m with an intial velocity {v^2}_{0 }.it collides with the ground loses 50% of its energy in collision and rebounds to the same heigh. the inital velocity v_0 (g=10m/s) 1)10m/s 2)14m/s 3)20m/s 4)28m/s

I want to know that why we use conservation of momentum

A body is projected at an angle from horizontal and it just touches the height y at a distance x from point of projection. Show that the velocity of projection is given as- g(2y+x2/2y).

A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that the end closer to the pole is 20 cm away from it. Find the length of the image.

62. A particle is moving in a straight line with uniform acceleration −5ms−2 and initial velocity 12.5 m/s.Distance travelled by it in 3rd second is1) 1 m2) Zero3) 1.25 m4) 2 m

Differentiate between:1. Mass and weight2. Universal gravitational constant and gravitational acceleration of earth

name the force that keeps the object moving in a circular path with constant acceleration.

100.What is right hand thumb rule and how to identify the direction of force with it .

State whether the speed is a scalar or a vector quantity. Give a reason for your choice.

When 4 kg of this solid is immersed in water, the buoyant force experienced by it is (given g =9.8 ms^- ) (A) 4.5g (B) 4g (C) 5g (D) 10g

Find the value g if the mass of the planet is 1.898*10^27 kg and the radius of the planet is 69911km and compare with the earth gravitational force

A body completes one revolution of a circular track of radius 4m in 2s . What is the average velocity of the body.

List out the physical quantities on which the gravitational force between objects depends. [2 MARKS]

102.A particle of rest mass m is travelling so that its total energy is twice its rest mass energy. It collides with another stationary particle of rest mass m to form a new particle. What is the rest mass of the new particle?

Name the physical quantities which are measured in the following units : (a) u (b) ly (c) ns (d) nm

ntA body weighs x g in air, y g in liquid and z g in water.The ratio of relative density of liquid and the body isn

14.Two tunning forks A and B of frequencies 200hz and 400 have are vibrated simultaneously. Then the ratio of time taken by the sound produced by A and B travel 660m and 990m respectively in air is ---------( velo. = 330 m/s)

what is the motion of an object if its dis†an ce is parallel to time axis

The potential of the Daniel cell, Zn|(ZnSO4)|∣(CuSO4∣Cu was reported by Buckbee, Surdzial and Metz as E∘=1.1028-0.641×10-3T + 0.72×10-5T2, where T is the temperature in degree celcius, Calcualte ΔS∘0 for the cell reaction at 25

Indeed there had been a distant for some time, although I had paid no attention to it. Now I started listening and I thought it sounded like the characteristic noise of jet airplanes constantly landing and taking off. Therefore rumbling means ____________________________.

Express 15 m s−1 in kmh−1.

117. two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz . The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats per second when both the wires oscillate together would be?

The earth is acted upon by gravitational force of attraction due to the sun. Then why does the earth not fall towards the sun?

What is the value of acceleration due to gravity of the Earth?(Given mass of the Earth is 6×1024 kg and radius of the Earth is 6.4× 106 m).

A soil has dry unit weight of 15.5 kN/m2, specific gravity of 2.65 and degree of saturation of 72%. Considering the unit weight of water as 10 kN/m3 , the water content of the soil (in % round off to two decimal places) is 19.26

In a thermonuclear reaction, 10−3 kg of hydrogen is converted into 0.99×10−3 kg of helium. If the efficiency of the generator is 50%, the electrical energy generated in kWh is

When calculating electric field at axial position due to uniform ring, why don't we use the relation linear density = dq/dl = Q/2piR?

A solid block of material density 6000 kg/m3 weighs 10 kg wt. in air. When it is immersed completely into a liquid, it weighs 6 kg wt. What is the density of the liquid?

107.A body A floats with 50% of volume submerged in a liquid B and 75% of its volume submerged in a liquid C. What is the ratio of the densities of A, B and C? What fraction of the body A will be seen above the surface of a homogenous mixture of equal volumes of the liquids B and C?

Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy? (a) Geothermal energy (b) Wind energy (c) Nuclear energy (d) Bio-mass

Differentiate between acceleration and velocity

The two planets with radii R1 and R2 have densities ρ1 and ρ2, and atmospheric pressures P1 and P2 respectively. Find the ratio of masses of their atmosphere. [neglecting the variation of g and ρ within the limits of atmosphere and height of atmosphere h<<R]

Which one is heavier on the surface of Earth: 1 m3 cotton or 1m3 of Iron?{provided: ρiron>ρcotton}