What is ‘Stealth Technology’?
- (A) A technology by which it is possible for the aircrafts to spy in the enemy air-space
- (B) A device which when attached to an aircraft makes it invisible on the radar
- (C) A coating which reduces the visibility of an aircraft on a radar
- (D) A technology by using which paratroopers can be dropped stealthily behind the enemy columns
- (C) A coating which reduces the visibility of an aircraft on a radar
Through which media does sound travel fastest?
- (A) Cool air
- (B) Warm air
- (C) Steel rod
- (D) Cold water
- (C) Steel rod
Splitting of light into its constituent colors is known as:
- (A) Reflection
- (B) Dispersion
- (C) Polarization
- (D) Refraction
- (B) Dispersion
The speed of sound will be the maximum through which of the following?
- (A) Air
- (B) Glass
- (C) Water
- (D) Wood
- (B) Glass
The color of an opaque object is due to the color it:
- (A) Absorbs
- (B) Reflects
- (C) Scatters
- (D) Refracts
- (B) Reflects
The lightning rod used for protecting buildings from lightning is made of:
- (A) Iron
- (B) Silver
- (C) Copper
- (D) Aluminum
- (C) Copper
The speed of light will be minimum while passing through:
- (A) Glass
- (B) Air
- (C) Water
- (D) Vacuum
- (A) Glass
An electric motor is used to convert electrical energy into _______ energy.
- (A) Mechanical
- (B) Potential
- (C) Kinetic
- (D) Chemical
- (A) Mechanical
The element used in an electric filament is:
- (A) Iron
- (B) Copper
- (C) Aluminum
- (D) Tungsten
- (D) Tungsten
The rear mirror of a motor vehicle is:
- (A) Plane
- (B) Convex
- (C) Concave
- (D) biconcave
- (B) Convex