Bats detect the obstacles in their path by receiving the reflected:
- (A) Radio waves
- (B) Ultrasonic waves
- (C) Infrasonic waves
- (D) Electromagnetic waves
- (B) Ultrasonic waves
When a stone is thrown in calm water of a pond, waves produced are:
- (A) Transverse waves
- (B) Longitudinal waves
- (C) Both (A & B)
- (D) Ultrasound waves
- (C) Both (A & B)
Newton’s first law of motion is valid only in the absence of:
- (A) Force
- (B) Net force
- (C) Friction
- (D) Momentum
- (B) Net force
Who said, “A body will remain at rest unless an external force acts on the body”?
- (A) Galileo
- (B) Newton
- (C) Einstein
- (D) Archimedes
- (B) Newton
The formula of Newton’s second law of motion is:
- (A) F=ma
- (B) F=ma 2
- (C) F=m2a
- (D) F=ma 2
- (A) F=ma
‘To every action there is always an equal and opposite reaction’ is Newton’s:
- (A) 1st Law of Motion
- (B) 2nd Law of Motion
- (C) 3rd Law of Motion
- (D) 4th Law of Motion
- (C) 3rd Law of Motion
The amount of matter in an object is known as:
- (A) Intertia
- (B) Mass
- (C) Weight
- (D) Pressure
- (B) Mass
The gravitational force on the body is called:
- (A) Weight
- (B) Mass
- (C) Density
- (D) Volume
- (A) Weight
Refrigerator is based on the principles of:
- (A) Sound
- (B) Light
- (C) Thermodynamics
- (D) Mechanics
- (C) Thermodynamics
Spring balance is used to measure:
- (A) Mass
- (B) Temperature
- (C) Time
- (D) Force
- (B) Temperature