1
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
2
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
3
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
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
In the given velocity (v) versus time (t) graph, accelerated and decelerated motions are respectively represented by line segments

Image
A
CD and BC
B
BC and AB
C
CD and AB
D
AB and CD
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