Thermal electricity is generated by using which of these?

• Coal only

• Coal and Natural Gas only

• Coal, Natural Gas and Petroleum

• Coal, Natural Gas and Petroleum

Which instrument is used for measuring humidity of atmosphere?

• Barometer

• Anemometer

• Thermometer

• Thermometer

Flemings, Left hand Rule is associated with the effect of

• Electric field on current

• Magnetic field on magnet

•  Electric field on magnet

•  Electric field on magnet

Fuse wire is a made of an alloy of

• Tin and Lead

• Tin and Copper

• Lead and Copper

• Lead and Copper

Which of the following has the lowest frequency?

• Visible light

• Gamma rays

• X-rays

• X-rays

For Photoelectric effect to take place, the metal used as the cathode should have .............

• high melting point

• low melting point

• low work function

• low work function

Which instrument is used for photographing the Sun?

• Galvanometer

• Potentiometer

• Spectrophoto meter

• Spectrophoto meter

48.

The reverse effect of X-ray emission is

• Raman effect

• Compton effect

• Zeeman effect

• Zeeman effect

A galvanometer can be converted to a voltmeter by connecting

• a high resistance in parallel

• a high resistance in series

• a low resistance in series

• a low resistance in series

The frequency of direct current is

• Zero

• 50 Hz

• 60 Hz

• 60 Hz