Question Detail

Force of attraction between the molecules of different substances is called

Surface tension
Cohensive force
Adhesive force
None of above

Answer: Option C

Explanation:

Cohensive force - Force of attraction between the molecules of same substance is called Cohensive force.

1. Orbital speed of a satellite is dependent of its mass.

True
False

Answer: Option B

Explanation:

Orbital speed of a satellite is independent of its mass.

2. What is refractive index ?

it is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .
it is defined as the product of speed of light in medium and in vacuum.
None of above

Answer: Option B

3. Siphon will fail to work if

both its limbs are of unequal length
the temperature of the liquids in the two vessels are the same
the level of the liquid in the two vessels are at the same height
the densities of the liquid in the two vessels are equal

Answer: Option C

4. Light year is a unit of

Time
Light
Distance
Intensity of light

Answer: Option C

5. Which instrument is used to measure the scattering of light by particles suspended in a liquid ?

Nephetometer
Ohmmeter
Ondometer
Pyrometer

Answer: Option A

Explanation:

Ohmmeter - is used to measure electrical resistance in ohms,

Ondometer - is used to measure frequency of electromagnetic waves,

Pyrometer - is used to measure very high temperature.