The earth E moves in an elliptical orbit with the sun S at one of the foci as shown in figure. Its speed of motion will be maximum at the point

(1) C

(2) A

(3) B

(4) D

Subtopic:  Kepler's Laws |
 85%
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 period of revolution of planet A around 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 ?

(1) 2                                         

(2) 3                                      

(3) 4                                        

(4) 5

Subtopic:  Kepler's Laws |
 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

If the radius of earth's orbit is made 1/4 th, the duration of an year will become -

(1) 8 times                                     

(2) 4 times

(3) 1/8 times                                   

(4) 1/4 times

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

advertisementadvertisement

If the mass of a satellite is doubled and the time period remain constant, the ratio of orbit in the two cases will be

(1)   1 : 2                                   

(2)   1 : 1

(3)   1 : 3                                   

(4)   None of these

Subtopic:  Orbital velocity |
 86%
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 maximum and minimum distances of a comet from the sun are 8×1012 m and 1.6×1012 m. If its velocity when nearest to the sun is 60 m/s, what will be its velocity in m/s when it is farthest -

(1) 12                                      

(2) 60

(3) 112                                     

(4) 6

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

A body revolved around the sun 27 times faster than the earth. What is the ratio of their radii?

(1)   1/3                                    

(2)   1/9

(3)   1/27                                  

(4)   1/4

Subtopic:  Kepler's Laws |
 67%
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 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