1
WB JEE 2008
+1
-0.25

If the earth shrinks such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take

A
96 hrs
B
48 hrs
C
6 hrs
D
1.5 hrs
2
WB JEE 2008
+1
-0.25

The weight of a body on surface of earth is 12.6 N. When it is raised to a height half the radius of earth, its weight will be

A
2.8 N
B
5.6 N
C
12.6 N
D
25.2 N
3
WB JEE 2023
+1
-0.25 Acceleration due to gravity at a height H from the surface of a planet is the same as that at a depth of H below the surface. If R be the radius of the planet, then H vs. R graph for different planets will be,

A B C D 4
WB JEE 2023
+2
-0.5 An earth's satellite near the surface of the earth takes about 90 min per revolution. A satellite orbiting the moon also takes about $$90 \mathrm{~min}$$ per revolution. Then which of the following is true?

[where $$\rho_{\mathrm{m}}$$ is density of the moon and $$\rho_{\mathrm{e}}$$ is density of the earth.]

A
$$\rho_{\mathrm{m}}<\rho_{\mathrm{e}}$$
B
$$\rho_{m}>\rho_{e}$$
C
$$\rho_{m}=\rho_{e}$$
D
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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