level 1

Why do we use a step-down transformer in a mobile charger?

• To increase voltage

• To decrease current

• To decrease current

• To store energy

If (2,3) and (2,5) are the endpoints of the diameter of a circle, the center is

• (4,8)

• (2,4)  

• (3,6)

• (5,4)

A device used to measure atmospheric pressure is called

• Thermometer

• Barometer

• Manometer

• Hygrometer

Why is silicon preferred over germanium in semiconductor devices?

• It is cheaper

• It has a higher melting point

• It has lower resistivity

• It is a better conductor

If cos(x) = 3/5, what is the value of sin(x)?

•  4/5

• 3/4

•  2/√5

• 1/√5

Which of the following is a noble gas?

• Oxygen  

• Nitrogen

• Argon

• Chlorine

What is the output of printf("%d", 'A');?

• A

• 65

• Compilation error

• Garbage value

How many ways can 5 students be arranged in a row?

• 5

• 25

• 120

• 60

Why are transmission lines operated at high voltage?

• To reduce power loss

•  To increase current

• To increase power loss

• To balance resistance

The primary function of a fuse in an electrical circuit is to

• Increase current

• Reduce voltage

• Protect against short circuits

• Regulate power supply