1 Which factor does electric field strength depend on? A Charge only B Distance only C Charge and distance D Mass
3 The minimum angle of incidence for which total internal reflection occurs is called: A Angle of refraction B Critical angle C Angle of deviation D Polarizing angle
4 Which optical device uses total internal reflection to change the direction of light? A Lens B Plane mirror C Prism D Magnifying glass
6 Which law of reflection states that the angle of incidence is equal to the angle of reflection? A First law of reflection B Second law of reflection C Law of refraction D Snell’s law
7 Which condition favors electrical breakdown? A Low electric field B High electric field C Low temperature D Low charge
9 Which device is used to detect electric charge? A Voltmeter B Ammeter C Galvanometer D Electroscope
11 What happens during discharging? A Charge increases B Charge remains constant C Charge flows away D New charge is produced
12 Gold leaves are used in an electroscope because they are: A Heavy B Elastic C Good conductors D Magnetic
13 An electroscope can be used to determine: A Amount of current B Type of charge C Resistance D Voltage
16 Corona discharge occurs when: A Field is very weak B Field is slightly below breakdown value C Field is zero D No charge is present
19 Optical fibers work on the principle of: A Reflection B Refraction C Total internal reflection D Dispersion
20 Spray painting uses electrostatics to: A Reduce paint usage B Increase heat C Produce sound D Increase voltage