Practice MCQ Questions and answers on Physics-GK

81

1 Micron is equal to

A) 10^–9 m B) 10^–12 m C) 10^–6 m D) 10^–15 m

Discuss

Answer & Solution

Answer: Option C

Solution:

1 Micron is equal to 10^-6 m.

82

A micron is equal to

A) 0.1 mm B) 0.01 mm C) 0.001 mm D) 0.0001 mm

Discuss

Answer & Solution

Answer: Option C

Solution:

A micron is equal to 0.001 mm.

83

Depth of ocean is measured by

A) Animometer B) Aerometer C) Siesmometer D) Fathometer

Discuss

Answer & Solution

Answer: Option D

Solution:

Fathometer is depth finder that uses sound waves to determine the depth of water.

84

'Parsec' is the unit measurement of

A) Density of stars B) Astronomical distance C) Brightness of heavenly bodies D) Orbital velocity of giant stars

Discuss

Answer & Solution

Answer: Option B

Solution:

One parsec is the distance to an object whose parallax angle is one arcsecond. The radius of the Earth's orbit equals one astronomical unit (AU), so an object that is one parsec distant is 206,265 AU (or 3.26 light-years) away.

85

Analog synthesis refers to a technology based on

A) Placing brief digital recordings of live sounds under the control of a synthesizer keyboard. B) Interfacing synthesizer equipment. C) Representing data in terms of measurable physical quantities. D) Representing physical quantities as numbers.

Discuss

Answer & Solution

Answer: Option C

Solution:

Analog synthesis uses a mixture of complex sounds that are shaped by filtering. It is based on representing data in terms of measurable physical quantities, in this case sound waves.

86

'Farad' is the unit of :

A) Capacitance B) Inductance C) Resistance D) Conductance

Discuss

Answer & Solution

Answer: Option A

Solution:

'Farad' is the unit of capacitance.

87

Which of the following have the same unit ?

A) Work and power B) Torque and moment of inertia C) Work and torque D) Torque and angular momentum

Discuss

Answer & Solution

Answer: Option C

Solution:

The SI unit of work is the Newton-metre or joule (J). A Newton meter is also the SI unit of torque (also called “moment” or “moment of force”).

88

Kilohertz is a unit which measures

A) Electromagnetic radio wave frequencies B) Electric resistance C) Power used by a current of one ampere D) Voltage

Discuss

Answer & Solution

Answer: Option A

Solution:

The hertz (Hz) is defined as one cycle per second and is a SI unit of frequency. Here kilohertz is also a unit of frequency of waves and is defined as 1000 cycles per second. Radio waves are measured in kilohertz (KHz).

89

What is the unit of the physical quantity "Inductance"?

A) Weber B) Farad C) Henry D) Tesla

Discuss

Answer & Solution

Answer: Option C

Solution:

Henry is the unit of the physical quantity "Inductance".

90

Pycnometer is an instrument used to measure the

A) Density B) Intensity of solar radiation C) Intensity of earthquake D) High temperatures

Discuss

Answer & Solution

Answer: Option A

Solution:

A gas pycnometer is a laboratory device used for measuring the density — or more accurately the volume — of solids, be they regularly shaped, porous or non-porous, monolithic, powdered, granular or in some way comminuted, employing some method of gas displacement and the volume-pressure relationship known as Boyle’s Law. A gas pycnometer is also sometimes referred to as a helium pycnometer. While pycnometer (of any type) is recognized as density measuring devices they are in fact devices for measuring volume only.