General Awareness : Physics

A satellite in vacuum

• is kept in orbit by remote control

• is kept in orbit by retro-rocket

• derives energy from gravitational field

• does not require any energy for orbiting

Tape recorder records sounds in the form of

• sound waves

• electrical energy

• magnetic energy

• variable resistance

The resistance of the human body (dry condition) is of the order of

• 10¹ ohm

• 10² ohm

• 10³ ohm

• 10⁴ ohm

The nuclear force is

• short range repulsive force

• short range attractive force

• long range repulsive force

• long range attractive force

β-particles emitted from a radioactive nuclei are

• fast moving electrons

• hydrogen nuclei

• helium nuclei

• fast moving neutrons

If the Earth stops rotating, the apparent value of g on its surface will

• increases at some places and remain the same at other places

• increases everywhere

• decreases everywhere

• remain the same everywhere

Fleming's right hand rule is used to find the direction of the

• alternate current

• direct current

• induced current

• actual current

Radar is used to

• locate sub-merged sub-marines

• receive signal from radio receivers

• detect and locate distant objects

• locate geostationary satellites

The unit of electrical power is

• volt

• watt

• kilowatt hour

• ampere

Certain substances loose their electrical resistance completely at super lower temperature. Such substances are called

• super conductors

• semi conductors

• dielectrics

• perfect conductors