Archives

Gravitational mass is proportional to gravitational

1) Field 2) Force 3) Intensity 4) All of these Answer: 2) Force Solution: Gravitational mass is dependent on the gravitational force.... View Article

The gravitational force Fg between two objects does not depend on

1) Sum of the masses 2) Product of the masses 3) Gravitational constant 4) Distance between the masses Answer: 1) Sum of the masses... View Article

Two identical solid copper spheres of radius R are placed in contact with each other. The gravitational attraction between them is proportional to

1) R2 2) R–2 3) R4 4) R–4 Answer: 3) R4 Solution: Mass of each sphere, M1 = M2 = ρ (4/3) π R3 The... View Article

The tidal waves in the sea are primarily due to

1) The gravitational effect of the moon on the earth 2) The gravitational effect of the sun on the earth 3) The gravitational effect of venus... View Article

The height at which the weight of a body becomes 1/16 th its weight on the surface of (radius R) is

1) 3R 2) 4R 3) 5R 4) 15R Answer: 1) 3R Solution: Acceleration due to gravity on the surface of the earth, g1 = GM/R2 Acceleration due to... View Article

A man can jump to a height of 1.5 m on a planet A what is the height he may be able to jump on another planet whose density and radius are respectively one- quater and one- third that of planet A

1) 1.5 m 2) 15 m 3) 18 m 4) 28 m Answer: 3) 18 m Solution: The work done that man did for jumping 1.5 m height in Earth. ⇒ mgh =... View Article

If density of earth increased 4 times and its radius becomes half of what it is then our weight will be ……

1) Four times it present calue 2) doubled 3) Remain same 4) halved Answer: 2) doubled Solution: The acceleration due to gravity,... View Article

Weight of body of mass m decreases by 1% when it is raised to height h above the earth’s surface. If the body is taken to a depth h in a mine. change in its weight is

1) 2% decreases 2) 0.5% decreases 3) 1% increases 4) 0.5% increases Answer: 2) 0.5% decreases Solution: Weight of the object on the... View Article

The density of the earth is doubled keeping its radius constant then the acceleration due to gravity will be ……………… ms^-2(g = 9.8 ms²)

1) 19.6 2) 9.8 3) 4.9 4) 2.45 Answer: 1) 19.6 Solution: Acceleration due to gravity, g = GM/R2 The density of the earth is doubled, the... View Article

The acceleration due to gravity is g at a point distance r from the center of earth R. if r < R then

1) g ∝ r 2) g ∝ r2 3) g ∝ r-2 4) g ∝ r-1 Answer: 1) g ∝ r Solution: g = F/m Inside... View Article

The acceleration due to gravity near the surface of a planet of radius R and density d is proportional to

1) d/R2 2) dR2 3) dR 4) d/R Answer: 3) dR We know, g= GM/R2 Mass= volume x density M = (4/3)πR3 x d = G (4/3)πR3... View Article

At what distance from the center of earth, the value of aceeleration due to gravity g will be half that of the surfaces (R = Radius of earth)

1) 2R 2) R 3) 1.414 R 4) 0.414 R Answer: 4) 0.414 R Solution: At height g' = g (R/(R +h)]2 (g/2) = g (R/(R +h)]2 (1/√2)... View Article

Assuming earth to be a sphere of a uniform density, what is value of gravitational acceleration in mine 100 km below the earth surface = …………… ms^-2

1) 9.66 2) 7.64 3) 5.00 4) 3.1 Answer: 1) 9.66 Solution: Therefore, ... View Article

If the mass of earth is 80 times of that of a planet and diameter is double that of planet and ‘g’ on the earth is 9.8 ms^-2 , then the value of ‘g’ on that planet is = …………… ms^-2

1) 4.9 2) 0.98 3) 0.49 4) 49 Answer: 3) 0.49 Solution: g = GM/R2 gp = 9.8/20 = 0.49 m/s2... View Article

If the radius of earth is R then height ‘h’ at which value of ‘g’ becomes one – fourth is

1) R/4 2) 3R/4 3) R 4) R/8 We know , g = GM/R2 gh = GM/(R+h)2 gh = (1/4) g h + R = 2R h = R... View Article

If mass of a body is M on the earth surface, than the mass of the same body on the moon surface is

1) M/6 2) 56 3) M 4) None of these Answer: 3) M Solution: The mass of the body is independent of the acceleration due to gravity,... View Article

If the density of small planet is that of the same as that of the earth while the radius of the planet is 0.2 times that of the earth, the gravitational acceleration on the surface of the planet is ……………

1) 0.2g 2) 0.4g 3) 2g 4) 4g Answer: 1) 0.2g Solution: g = GM/R2 M = Volume x density M = (4/3)πR3ρ Therefore, g =... View Article

The moon’s radius is 1/4 that of earth and its mass is 1/80 times that of the earth. If g represents the acceleration due to gravity on the surface of earth, that on the surface of the moon is …………..

1) g/4 2) g/5 3) g/6 4) g/8 Answer: 2) g/5 Solution: Aceleration due to gravity on the surface of Earth, g = GMe/Re2 Aceleration due... View Article

If earth rotates faster than its present speed the weight of an object will.

1) increases at the equator but remain unchanged of the poles. 2) Decreases at the equator but remain unchanged at poles. 3) Remain unchanged... View Article

The value of g on the earth surface is 980 cm/sec² . Its value at a height of 64 km from the earth surface is …………… cms^–2

1) 960.40 2) 984.90 3) 982.45 4) 977.55 Answer: 1) 960.40 Solution: (g'/g) = [R/(R+h)]2 Given h = 64 km g = 980 cm/s2 g' = g [R/(R +... View Article

M	T	W	T	F	S	S
						1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30	31