1
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eyepiece is
A
12.5 cm
B
5 cm
C
2 cm
D
10 cm
2
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following force is non-central and non-conservative?
A
Frictional force
B
Electric force
C
Gravitational force
D
Mechanical force
3
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Consider the following statements relating to Richter scale.

1. It was devised in 1935 by Charles F. Richter.

2. It describes the quantity of energy released by a single earthquake.

3. Richter scale has no upper limit.

Which of the statement(s) given above is/are correct?
A
Only 1
B
1 and 2
C
2 and 3
D
All of the above
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Suppose there are two planets, 1 and 2, having the same density, but their radii are R1 and R2 respectively, where R1 > R2. The accelerations due to gravity on the surface of these planets are related as
A
g1 > g2
B
g1 < g2
C
g1 = g2
D
Cannot say anything
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