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Question-1 The largest and the shortest distance of the earth from the sun are r₁ and r₂. Its distance from the sun when it is perpendicular to the major axis of the orbit drawn from the sun.

(A)	(B)
(C)	(D)

Question-2 The period of revolution of planet A round the sun is 8 times that of B. The distance of A from the sun is how many times greater than that of B from the sun ?

(A) 5	(B)4
(C)3	(D)2

Question-3
A planet is moving in elliptical orbit around the sun. If T, U, E and L stand for its kinetic energy, gravitational potential energy, total energy and magnitude of angular momentum about the centre of force, which of the following is correct?

(A) T is conserved	(B) U is always positive
(C) E is always negative	(D) L is conserved but direction of vector L changes continuously

Question-4
A seconds pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket

(A) comes down with uniform acceleration.	(B) moves round the earth in a geostationary orbit.
(C) moves up with a uniform velocity	(D) moves up with uniform acceleration

Question-5
What will be the formula of the mass in terms of g, R and G? (R = radius of earth)

(A) g² ^R/_G	(B) G R²/_g
(C) G ^R/_g	(D) g R²/_G

Question-6 Two satellites of earth, S₁ and S₂ , are moving in the same orbit. The mass of is S₁ four times the mass of S₂ . Which one of the following statements is true ?

(A) The time period of S₁ is four times that of S₂	(B)The potential energies of earth and satellite in the two cases are equal.
(C)S₁ and S₂are moving with the same period	(D)The kinetic energies of the two satellites are equal

Question-7 The escape velocity of a sphere of mass m is given by (G = universal gravitational constant, M_e = mass of earth and R_e = radius of earth)

(A)	(B)
(C)	(D)

Question-8 A body attains a height equal to the radius of the earth. The velocity of the body with which it was projected is

(A)	(B)
(C)	(D)

Question-9
Two spheres of masses m and M are situated in air and the gravitational force between them is F. The space around the masses is now filled with a liquid of specific gravity 3. The gravitational force will now be

(A)	(B)
(C) 3F	(D) F

Question-10 A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between

(A) 14 m/s and 15 m/s	(B)15 m/s and 16 m/s
(C)16 m/s and 17 m/s	(D)13 m/s and 14 m/s

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Plus 1 Biology Science

ICSE/ISC

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