quiz

Which one of the following is a vector quantity?

• Force

• Temperature

• Mass

• Time

What type of energy is stored in the spring of a watch?

• Heat energy

• Chemical energy

• Kinetic energy

• Potential energy

The working of a rocket is based on which Newton's law of motion?

• First

• Second

• Third

• Fourth

What is the minimum escape velocity of a rocket to be launched from Earth to space?

• 2 km/s

• 9.8 km/s

• 11.2 km/s

• 18 km/s

The value of acceleration due to gravity at the equator will____ when the Earth stops rotating

• Increase

• Decrease

• Become zero

• Remain same

Which of the following is a good conductor of electricity?

• Paper

• Kerosene

• Graphite

• Dry air

What is the frequency of direct current?

• 50 HZ

• 60 HZ

• Zero

• Infinite

Which of the below waves cannot be polarised?

• Sound

• Radio

• Infrared

• Ultraviolet

Which device is used for converting alternating current (AC) to direct current (DC)?

• Rectifier

• Transformer

• Dynamo

• Induction coil

Which material is the best heat conductor?

• Still

• Diamond

• Lithium

• copper