Basic science JSS1

------ is defined as the ability to do work

• Power

• Energy

• Voltage

• Current

The process by which electrons leave the surface of hot metals by simple application of heat is called?

• Thermionic emission

• Primary emission

• Secondary emission

• Photo electric emission

The process by which electric charges possessing high kinetic energy are made to bonbard the surface of a metal is known as?

• Parallel emission

• Serial emission

• Photo electric emission

• Secondary emission

In photo electric emission, electrons leave the surface of metal by simple application of?

• Heat

• Light

• Current

• Solution

The method of freeing electrons by the use of energy stored in electric or magnetic field is called?

• Thermionic emission

• Photo electric emission

• Cold cathode emission

• Circular series and parallel

A resistor can either be connected in ?

• Straight or circular

• Circular or cylindrical

• Parallel or series

• All of the above

The amount of electrical energy transferred by an appliance depends on its

• Distance and speed

• Work and energy

• Power and length of time

• Length and width

Voltmeter is an instrument for measuring?

• Resistance

• Power

• Current

• The potential difference of a conductor

The instrument that measures the flow of current in a conductor is

• Potentiometer

• Ammeter

• Voltmeter

• Thermometer

The material in the house that protects the electrical appliances against earth fault is?

• Circuit breakers

• Insulator

• Electric meter

• Switch