The period of the moon’s rotation around the earth is nearly 29 days. If the moon’s mass were 2 fold, its present value and all other things remained unchanged, the period of the moon’s rotation would be nearly:

(1)292 days                                       

(2)29/2 days

(3)29×2 days                                       

(4)29 days

Subtopic:  Satellite |
 64%
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

If two planets are at mean distances \(d_1\) and \(d_2\) from the sun and their frequencies are \(n_1\) and \(n_2\) respectively, then:
1. \(n^2_1d^2_1= n_2d^2_2\)
2. \(n^2_2d^3_2= n^2_1d^3_1\)
3. \(n_1d^2_1= n_2d^2_2\)
4. \(n^2_1d_1= n^2_2d_2\)

Subtopic:  Kepler's Laws |
 67%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Suppose the law of gravitational attraction suddenly changes and becomes an inverse cube law i.e.\(,F\propto \frac{1}{r^3}\) but the force still remains a central force, then:
1. Kepler's law of areas still holds.
2. Kepler's law of period still holds.
3. Kepler's law of areas and period still hold.
4. Neither the law of areas nor the law of period still hold.

Subtopic:  Kepler's Laws |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

A planet is revolving around the sun as shown in an elliptical path.

The correct option is:

(1)   The time taken in travelling DAB is less than that for BCD

(2)   The time taken in travelling DAB is greater than that for BCD

(3)   The time taken in travelling CDA is less than that for ABC

(4)   The time taken in travelling CDA is greater than that for ABC

Subtopic:  Kepler's Laws |
 79%
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

In an elliptical orbit under gravitational force, in general

(1) Tangential velocity is constant

(2) Angular velocity is constant

(3) Radial velocity is constant

(4) Areal velocity is constant

Subtopic:  Kepler's Laws |
 73%
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

Earth is revolving around the sun, if the distance of the Earth from the Sun is reduced to 1/4th of the present distance then the present year length reduced to -

(1)14                                        

(2)12  

(3)18                                        

(4)16  

Subtopic:  Kepler's Laws |
 84%
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

advertisementadvertisement

Two satellite are revolving around the earth with velocities v1 and v2 and in radii r1 and r2r1>r2respectively. Then -

(1)v1=v2                                

(2)v1>v2  

(3)v1<v2                                

(4)v1r1=v2r2  

Subtopic:  Orbital velocity |
 79%
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

If orbital velocity of planet is given by v=GaMbRc, then -

(1)a=1/3, b=1/3, c=1/3      

(2)a=1/2, b=1/2, c=1/2      

(3)a=1/2, b=1/2, c=1/2   

(4)a=1/2, b=1/2, c=1/2          

Subtopic:  Orbital velocity |
 89%
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 mass of a planet that has a moon whose time period and orbital radius are T and R respectively can be written as -

(1)4π2R3G1T2                                

(2)8π2R3G1T2  

(3)12π2R3G1T2                               

(4)16π2R3G1T2  

Subtopic:  Satellite |
 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

advertisementadvertisement

The eccentricity of earth's orbit is 0.0167. The ratio of its maximum speed in its orbit to its minimum speed is

(a)   2.507                                             (b)   1.033

(c)   8.324                                             (d)   1.000

Subtopic:  Kepler's Laws |
 71%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints