The owl can see most clearly in complete darkness because:
- (A) It has squint eyes
- (B) It has light bulbs in its eyes
- (C) It produces infrasonic sounds
- (D) It has large eyes with orbs directed forward, giving it binocular sight
- (D) It has large eyes with orbs directed forward, giving it binocular sight
A bird sitting on a high tension electric wire does NOT get electrocuted because:
- (A) Its feet are good insulators
- (B) It does not form a closed path for the flow of current
- (C) The body is earthed
- (D) Sit has high resistance
- (B) It does not form a closed path for the flow of current
When the door of an operating refrigerator is opened the temperature of the room will:
- (A) Decrease
- (B) Increase
- (C) Fall down immediately
- (D) Remain unchanged
- (B) Increase
In a refrigerator, cooling is produced by:
- (A) Sudden expansion of a compressed gas
- (B) The evaporation of a volatile liquid
- (C) Loss of heat due to absorption
- (D) The ice which deposits on the freezer
- (B) The evaporation of a volatile liquid
Rainbow is seen after rain because of hanging molecules of water which act as:
- (A) Slabs
- (B) Lens
- (C) Mirror
- (D) Prism
- (C) Mirror
Why the needle of iron swims on water surface when it is kept gently?
- (A) Due to its shape
- (B) Due to surface tension
- (C) It will remain under the water due to weight
- (D) The density of needle is less than its weight
- (B) Due to surface tension
If a lift is going up with acceleration, the apparent weight of a body is:
- (A) More than the actual weight
- (B) Less than the actual weight
- (C) More or less than the actual weight
- (D) Equal to the actual weight
- (A) More than the actual weight
If speed of rotation of earth increases what effect it would have on the weight of your body?
- (A) Weight increases
- (B) Weight decreases
- (C) Weight remains the same
- (D) Weight becomes double
- (B) Weight decreases
A person sitting in an open car moving at constant velocity throws a ball vertically upwards in air. If effect of air resistance is neglected, the ball will fall:
- (A) In the car behind the person
- (B) In the car ahead of the person
- (C) Outside the cars
- (D) Exactly in hands of the person
- (D) Exactly in hands of the person
Why is a cyclist required to bend inwards while moving in a circular path?
- (A) To keep the vehicle on the road
- (B) To increase the speed of cycle
- (C) To make the center of gravity fall with the base
- (D) To produce the necessary centripetal force required to keep him moving in a curved path
- (D) To produce the necessary centripetal force required to keep him moving in a curved path