1
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
2
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
3
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
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
1 dyne (a unit of force in CGS system) equals to
A
103 g-cm/s2
B
10$$-$$3 g-cm/s2
C
105 kg-cm/s2
D
10$$-$$5 kg-m/s2
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