Q. Electric conduction in a semiconductor takes place due to -
1) Electrons only
2) Holes only
3) Both electrons and holes
4) Neither electrons nor holes
Q. Which of the following is not true about X-rays ?
1) have low penetrating power
2) travel with the speed of light
3) can be reflected or refracted
4) can affect photographic plates
Q. The amount of heat required to change the unit mass of a liquid to gaseous state without any change in temperature is known as -
1) Specific heat capacity
2) Mechanical equivalent
3) Latent heat of vaporization
4) Quenching
Q. An optical illusion which occurs mainly in deserts during hot summer is based on the principle of -
1) Reflection
2) Interference
3) Dispersion
4) Total internal reflection
Q. At which place Earth's magnetic field becomes horizontal?
1) Magnetic meridian
2) Magnetic equator
3) Geographical pole
4) Tropic of Cancer
Q. A Kelvin thermometer and a Fahrenheit thermometer both given the same reading for a certain sample. What would be the corresponding reading in a Celsius thermometer?
1) 574.25
2) 301
3) 273
4) 232
Q. Why is it difficult to measure the coefficient of expansion of a liquid than solid?
1) Liquids tend to evaporate at all temperatures
2) Liquids conduct more heat
3) Liquids expand too much when heated
4) Their containers also expand when heated
Q. An inductor stores energy in -
1) electrostatic field
2) electromagnetic field
3) core
4) magnetic field
Q. Liquid crystal material is used in -
1) Ultrasonic amplification and display devices
2) Display devices and thermal
3) Thermal sensors and transducers
4) Transducers and ultrasonic amplification
Q. Which material may also be considered a semiconductor element?
1) Carbon
2) Argon
3) Ceramic
4) Mica
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