NTS Past Papers Physics Objective Type MCQs

Q.1: If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from——-?

1. chromatic aberration
2. spherical aberration
3. both spherical and chromatic
4. distortion

Q.2: A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is——-?

1. f2 + f1
2. f2 – f1
3. f1f2/f2+f1
4. f1f2/f1-f2

Q.3: In multimode step index fibre the refractive index of core and cladding is——?

1. same
2. different
3. zero
4. different with refractive index of core higher than cladding

Q.4: Final image produced by a compound microscope is——-?

1. real and inverted
2. real and erect
3. virtual and erect
4. virtual and inverted

Q.5: For normal adjustment, length of astronomical telescope is——-?

1. fo + fe
2. fo – fe
3. fo / fe
4. fe / fo

Q.6: Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is——-?

1. zero
2. focus
3. 2 f
4. f/2

Q.7: Least distance of distinct vision——-?

1. increases with increase in age
2. decreases with increase in age
3. neither increases nor decreases
4. becomes infinite after 60 years

Q.8: Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is———?

1. 0.5
2. 0.2
3. 1
4. 2

Q.9: A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called——-?

1. center of curvature
2. focus
3. optical center
4. aperture

Q.10: The value of critical angle for glass is——–?

1. 42°
2. 47°
3. 52°
4. 50°