Longitudinal waves do not exhibit _____________________?
A. reflection
B. refraction
C. diffraction
D. polarization
Photoelectric effect was given by ____________________?
Photoelectric effect was given by ____________________?
A. Hertz
B. Fresnel
C. Einstein
D. Plank
Which one of the following properties of light does not change with the nature of the medium ?
Which one of the following properties of light does not change with the nature of the medium ?
A. velocity
B. wavelength
C. amplitude
D. frequency
In double slit experiment we observe _____________________?
In double slit experiment we observe _____________________?
A. interference fringes only
B. diffraction fringes only
C. both interference and diffraction fringes
D. polirized frringes
Optical active crystals rotates the __________________?
Optical active crystals rotates the __________________?
A. vibrating plane
B. polarization plane
C. diffraction plane
D. interference plane
Which one of the following bulbs has the least resistance ?
Which one of the following bulbs has the least resistance ?
A. 100 watt
B. 200 watt
C. 300 watt
D. 60 watt
A fuse is placed in series with the circuit to protect against__________________?
A fuse is placed in series with the circuit to protect against__________________?
A. high power
B. high voltage
C. high current
D. over heating
Electrical energy is converted to heat at the rate of___________________?
Electrical energy is converted to heat at the rate of___________________?
A. IRt
B. I2R
C. I2Rt
D. VIt
Electrical energy is measured in___________________?
Electrical energy is measured in___________________?
A. watt
B. horse power
C. kilo watt
D. kilowatt hour
The resistance of a conductor at absolute zero (OK) is________________?
The resistance of a conductor at absolute zero (OK) is________________?
A. zero almost
B. infinite almost
C. no prediction at all
D. may increase or decrease