# If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the surface of earth to a height equal to the radius of the earth R, is  1. $\frac{1}{2}mgR$ 2. 2 mgR 3. mgR 4. $\frac{1}{4}mgR$

Subtopic:  Gravitational Potential Energy |
69%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Weightlessness experienced while orbiting the earth in a space-ship is the result of:

1. Inertia
2. Acceleration
3. Zero gravity
4. Freefall towards the earth

Subtopic:  Satellite |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

The escape velocity for a rocket from the earth is $$11.2$$ km/s. Its value on a planet where the acceleration due to gravity is double that on the earth and the diameter of the planet is twice that of the earth (in km/s) will be:

 1 $$11.2$$ 2 $$5.6$$ 3 $$22.4$$ 4 $$53.6$$
Subtopic:  Escape velocity |
78%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The escape velocity from the earth is about 11 km/second. The escape velocity from a planet having twice the radius and the same mean density as the earth is

(1) 22 km/sec                               (2) 11 km/sec

(3) 5.5 km/sec

(4) 15.5 km/sec

Subtopic:  Escape velocity |
70%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

What should be the velocity of earth due to rotation about its own axis so that the weight at equator become 3/5 of initial value. Radius of earth on equator is 6400 km

(a)  $7.4×{10}^{-4}$ rad/sac

(b)  6.4$×{10}^{-4}$ rad/sac

(c)  $7.8×{10}^{-4}$ rad/sac

(d)  8.7$×{10}^{-4}$ rad/sac

Subtopic:  Acceleration due to Gravity |
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

If g is the acceleration due to gravity at the earth's surface and r is the radius of the earth, the escape velocity for the body to escape out of the earth's gravitational field is:

(1) gr

(2) $\sqrt{2gr}$

(3) g/r

(4) r/g

Subtopic:  Escape velocity |
95%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The escape velocity of a projectile from the earth is approximately

(1)11.2 m/sec                            (2)112 km/sec

(3)11.2 km/sec                           (4)11200 km/sec

Subtopic:  Escape velocity |
83%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The escape velocity of a particle of mass m varies as:

(1) ${m}^{2}$

(2) m

(3) ${m}^{0}$

(4) ${m}^{-1}$

Subtopic:  Escape velocity |
80%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Acceleration due to gravity is ‘g’ on the surface of the earth. The value of acceleration due to gravity at a height of 32 km above earth’s surface is (Radius of the earth = 6400 km)

(1) 0.9 g

(2) 0.99g

(3) 0.8 g

(4) 1.01 g

Subtopic:  Acceleration due to Gravity |
80%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The time period of a simple pendulum on a freely moving artificial satellite is

(1) Zero

(2) 2 sec

(3)  3 sec

(4)  Infinite

Subtopic:  Satellite |
74%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch