Why is the light of an ordinary lamp hotter than that of the tube light?

D. It is due to a larger filament

A refracting telescope consists of ?

A. A primary lens and a secondary lens

B. A primary mirror and a secondary mirror

C. A primary lens and a secondary mirror

D. A concave mirror and a plane mirror

D. Passes through its principal focus

A. Passes through the optical centre undeviated

B. Passes through its centre of curvature

C. Becomes parallel to the principal axis again

D. Passes through its principal focus

Everyday Science · Physics in Everyday Life · page 44 of 44

Includes 30 past paper MCQs (marked).

Timed quizzes, instant results, track your progress — free

6 MCQs with answers and a short one-liner. Hide answers to test yourself.

Answers and one-liners are hidden. Tap an option to check that question, or show all.

431.
Why is the light of an ordinary lamp hotter than that of the tube light?
Correct Answer: A. It is due to incandescence
One-liner
The light of an ordinary lamp is hotter than that of a tube light because it works on the principle of incandescence, where a filament is heated to a high temperature to produce light.
432.
A refracting telescope consists of ?
Correct Answer: A. A primary lens and a secondary lens
One-liner
A refracting telescope consists of a primary lens and a secondary lens.
433.
A ray parallel to the principal axis, after refraction from a convex lens, ?
Correct Answer: D. Passes through its principal focus
One-liner
A ray parallel to the principal axis, after refraction from a convex lens, passes through its principal focus.
434.
Which one of the following waves are used by the common TV remote control?
Correct Answer: B. Infrared waves
One-liner
Common TV remote controls use infrared waves to transmit signals to the television.
435.
The splitting of white light into seven colors on passing through a glass prism is due to ?
Correct Answer: C. Dispersion
One-liner
The splitting of white light into seven colors on passing through a glass prism is due to dispersion.
436.
An object that does not produce light but reflects light that comes from a luminous object is called?
Correct Answer: B. Non-luminous
One-liner
An object that does not produce its own light but reflects light from a luminous source is called a non-luminous object.