SAT (Stage-1) Mock Test

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SAT (Stage-1) Mock Test - 1

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Question 1
1 / -0

An object is initially at a distance of 500 cm from a plane mirror. If the mirror approaches the object at a speed of 2 cm/s, then after 6 seconds, the distance between the object and its image will be

A
476 cm

B
976 cm

C
226 cm

D
150 cm

Solution

Distance travelled by the mirror towards the object in 6 seconds,

d = vt = 2 × 6 =12 cm

Hence, distance between the object and the mirror = 500 - 12 = 488 cm

In case of the plane mirror, object distance = image distance

Hence, distance between the object and its image = 2 × 488 = 976 cm
Question 2
1 / -0

To obtain a magnified virtual image of an object by a convex lens of focal length f, the distance between the object and the lens should be

A
> 4f

B
between 2f and 4f

C
< f

D
> 6f

Solution

If the object is placed between the focus and the optical centre, then an enlarged, virtual and erect image will be formed on the same side as the object.
Question 3
1 / -0

Parsec is the unit of

A
time

B
distance

C
frequency

D
angular acceleration

Solution

The parsec (symbol: pc) is a unit of length used in astronomy. It is about 3.26 light-years, or just under 31 trillion (3.1 x 10¹³) kilometres (about 19 trillion miles).