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1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
In case of a compound microscope, which of the following statements is/are correct?

1. The focal length of the eyepiece is larger than the focal length of the objective.

2. The focal length of the eyepiece is smaller than the focal length of the objective.

3. The image produced in a normal optical microscope is real.

4. The image produced in a normal optical microscope is virtual.

Select the correct answer using the codes given below.
A
Only 1
B
1 and 4
C
2 and 3
D
2 and 4
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following statements is not correct?
A
The radius of curvature of a concave mirror is twice its focal length.
B
Power of a convex lens is negative and that of a concave lens is positive.
C
The radius of curvature of a plane mirror is infinity.
D
When a ray of light passes from an optically denser medium to an optically rarer medium, an angle of refraction is greater than the corresponding angle of incidence.
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following statements is not correct?
A
If the velocity and acceleration have opposite sign, then the object is slowing down.
B
If the velocity is zero at an instant, then the acceleration should also be zero at that instant.
C
If the velocity is zero for a time interval, then the acceleration is zero at any instant within the time interval.
D
If the position and velocity have opposite sign, then the object is moving towards the origin.
4
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Three equal resistances when combined in series are equivalent to 90$$\Omega$$. Their equivalent resistance when combined in parallel will be
A
10$$\Omega$$
B
30$$\Omega$$
C
270$$\Omega$$
D
810$$\Omega$$
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