1
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
2
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
3
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The sun is seen little before it rises and for a short while after it sets. This is because of
A
total internal reflection
B
atmospheric refraction
C
apparent shift in the direction of sun
D
dispersion
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The figure shown below gives the time (t) versus position (x) graph of three objects A, B and C. Which one of the following is the correct relation between their speeds vA, vB and vC, respectively at any instant (t > 0) ?

Image
A
vA < vB < vC
B
vA > vB > vC
C
vA = vB = vC $$\ne$$ 0
D
vA = vB = vC = 0
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