What is the unit of luminous efficiency of electric bulb?
- (A) Lox
- (B) Watt
- (C) Lumen per watt
- (D) None of these
- (C) Lumen per watt
OLED stands for:
- (A) Organic Light Emitting Device
- (B) Organic Light Emitting Diode
- (C) Organic Light Emitting Disc
- (D) None of these
- (B) Organic Light Emitting Diode
The energy gap value of “Gallium arsenide (GaAs)” is:
- (A) 2.5 eV
- (B) 1.42 eV
- (C) 3.43 eV
- (D) None of these
- (B) 1.42 eV
What is the energy possessed by a body due to its motion?
- (A) Kinetic energy
- (B) Potential energy
- (C) Conventional energy
- (D) None of these
- (A) Kinetic energy
The period of pendulum is determined by its:
- (A) Mass
- (B) Amplitude
- (C) Length
- (D) None of these
- (C) Length
A body which undergoes simple harmonic motion is called:
- (A) Harmonic amplifier
- (B) Harmonic oscillator
- (C) Harmonic pendulum
- (D) None of these
- (B) Harmonic oscillator
Which law of Newton states that “The need to wear seat belts”?
- (A) First law of motion
- (B) Second law of motion
- (C) Third law of motion
- (D) None of these
- (C) Third law of motion
What is the force that keeps the planets revolving around the Sun?
- (A) Centrifugal force
- (B) Centripetal force
- (C) Gravity
- (D) None of these
- (C) Gravity
A region of space from which nothing (not even light) can escape is called:
- (A) Nova
- (B) Black hole
- (C) White hole
- (D) None of these
- (B) Black hole
Which of the following statements is not true about speed?
- (A) Speed has no direction
- (B) Speed is a vector quantity
- (C) Speed is measured relative to another object
- (D) All of these
- (B) Speed is a vector quantity