The escape of water molecules from surface is called:
A. Sublimation
B. Condensation
C. Evaporation
D. None of these
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Heating element of an electric heater is made up of which metal?
A. Lead
B. Tungsten
C. Nichrome
D. None of these
Correct Answer: C
Nichrome is a metal alloy made up of around 20 percent of chromium and 80 percent nickel. Nichrome has a high melting point and it won’t oxidise at higher temperature
Cooking gas is also called:
A. Butane
B. Propane
C. Hexane
D. None of these
Correct Answer: A
Cooking gas is also known as liquified Petroleum Gas (LPG), is a mixture of propane and butane. It is better suited to indoor use, and fuelling appliances like portable gas heaters and single-burner cooking stoves.
A. Light
B. Energy
C. Waves
D. None of these
Correct Answer: A
Objects that give out or emit light of their own are called as luminous objects . Sun, Bulb and candle emit their own light and hence, are luminous objects.
Alternative current (AC) is converted into direct current (DC) by using a:
A. Generator
B. Rectifier
C. Voltmeter
D. None of these
Correct Answer: B
Direct current (DC) is converted into alternating current (AC) by using a Inverter.
The color which we see when our eyes are closed?
A. Eigengrau
B. Grey
C. Black
D. None of these
Correct Answer: A
The colour you see when you close your eyes is not black. It’s lighter than black and is called Eigengrau.
An ordinary mobile phone communicates by using:
A. Microwaves
B. Radio waves
C. Infrared waves
D. None of these
Correct Answer: B