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11th Standard English Medium Physics Subject Gravitation Book Back 1 Mark Questions with Solution Part - I updated Book back Questions

Published on: 13/05/2022

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Std: 11th Standard - Physics

chapter: - Book back Questions

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Questions:

Multiple Choice Question

5 x 1 = 5

If the acceleration due to gravity becomes 4 times its original value, then escape speed

(a)

remains same

(b)

2 times of original value

(c)

becomes halved

(d)

4 times of original value

If a person moves from Chennai to Trichy, his weight

(a)

increases

(b)

decreases

(c)

remains same

(d)

increases and then decreases

If the mass and radius of the Earth are both doubled, then the acceleration due to gravity g'

(a)

remains same

(b)

\({g\over 2}\)

(c)

(d)

The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are K_A, K_B and K_C respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then

(a)

K_A > K_B >K_C

(b)

K_B < K_A < K_C

(c)

K_A < K_B < K_C

(d)

K_B > K_A > K_C

According to Kepler’s second law, the radial vector to a planet from the Sun sweeps out equal areas in equal intervals of time. This law is a consequence of

(a)

conservation of linear momentum

(b)

conservation of angular momentum

(c)

conservation of energy

(d)

conservation of kinetic energy

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Answers Key:

Multiple Choice Question

5 x 1 = 5

\(\text { Escape speed } v_{e}=\sqrt{2 g R}\)
\(\text { If } g^{\prime}=4 \mathrm{~g}\)
\(\text { Then } v_{e}^{\prime}=\sqrt{2(4 g) R}\)
\(=\sqrt{2 g R} \times 2 \)
\(=2 v_{e} \)

(b)
decreases

g = \(\frac{GM_e}{R^2_e}\)
M_e = 2 M_e R_e= 2 R_ethen,
g' = \(\frac{G \times 2M_e}{(2R_e)^2}\) = \(2 \frac{Gm_e}{4R_e^2}\)
\(2 \frac{Gm_e}{4R_e^2}\) = \(\cfrac g2\)