Physics - Questions and Answers, General Study (GK)

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291.

A double convex glass lens of focal length 'f' and having a circular aperture is cut into two halves, each having a semicircular aperture. The focal length of each half is

(a)f

(b)2f

(c)f/2

(d)infinity

Comment

Answer is: ANA

292.

A person standing in front of a mirror finds his image thinner but with normal height. The mirror in question is

(a)concave and spherical

(b)convex and spherical

(c)convex and cylindrical with axis vertical

(d)convex and cylindrical with axis horizontal

Comment

Answer is: CNA

293.

Why is red light employed for danger signals?

(a)red colour is smoothing to the eye

(b)human eye is most sensitive to red colour

(c)red light is scattered least

(d)red light is scattered most

Comment

Answer is: CNA

294.

Whose experiments proved that the speed of light was always the same?

(a)James clark Maxwell

(b)Michelson and Marley

(c)Miller and Stanley

(d)Werner Heisenberg

Comment

Answer is: CNA

295.

The image formed by plane mirror is

(a)real

(b)virtual

(c)may be virtual or real depending on the position of the object

(d)none of the above

Comment

Answer is: BNA

296.

Small distance for clear vision to the normal eye is

(a)25 cm

(b)25 mm

(d)20 cm

Comment

Answer is: ANA

297.

To an observer on the lunar surface, during the day time the sky will appear to be

(a)light yellow

(b)orange

(c)blue

(d)black

Comment

Answer is: DNA

298.

If the angle between two plane mirrors is 60, then the number of image formed will be

(a)infinite

(b)7

(d)5

Comment

Answer is: DNA

299.

A water tank appears shallower when it is viewed from top due to

(a)rectilinear propagation of light

(b)reflection

(c)total internal reflection

(d)refraction

Comment

Answer is: DNA

300.

The Primary colours in photography are

(a)red, blue, yellow

(b)red, yellow, green

(c)red, blue, green

(d)red, green, cyan

Comment

Answer is: CNA

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Physics - Questions and AnswersPage 30

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