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Q:

HEPA filters are used to remove microbes from

A) human tissues B) air
C) medical instruments D) liquids
 
Answer & Explanation Answer: B) air

Explanation:

High-efficiency particulate air (HEPA), also known as high-efficiency particulate absorbing and high-efficiency particulate arrestance, is an efficiency standard of air filter.

hepa-filters1596516018.png image

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Q:

If an object moves in a purely rotatory motion, then each constituent particle of the body moves in a circle, the centre of which is located on a line is called _______.

A) the axis of rotation B) the line of rotation
C) the spinning rod D) the fixed line
 
Answer & Explanation Answer: A) the axis of rotation

Explanation:
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3 1028
Q:

Sextant is an instrument used in which of the following ?

A) Gynaecology B) Navigation
C) Birth control D) Medical treatment
 
Answer & Explanation Answer: B) Navigation

Explanation:
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Q:

____________________is a measure of the actual amount of water vapour in a particular sample of air: measured as a partial pressure.

A) Specific Humidity B) Absolute Humidity
C) Relative Humidity D) Dew Point
 
Answer & Explanation Answer: B) Absolute Humidity

Explanation:
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Q:

Humidity is a measure of the _______________.

A) pressure in the air B) viscosity of the air
C) air resistance D) moisture in air
 
Answer & Explanation Answer: D) moisture in air

Explanation:
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Q:

A  photon  of  X-ray  has  energy  of  1  keV.  A photon of visible radiation has energy of 3 eV.  In  this  context,  which  one  of  the following statements is not correct?

A) The wavelength of X-ray photon is less than the wavelength of visible radiation photon. B) Both    the    photons    have    different energies.
C) The  speeds  of  both  the  photons  in vacuum are different D) The   frequency   of   X-ray   photon   is higher  than  the  frequency  of  visible radiation photon.
 
Answer & Explanation Answer: C) The  speeds  of  both  the  photons  in vacuum are different

Explanation:

The speed of all the electromagnetic radiation are always   same   and   equal   to   the numerical value 3 x 10^8m/sec.

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Q:

Air expands when it _______________.

A) is cooled B) is heated
C) is under pressure D) becomes more humid
 
Answer & Explanation Answer: B) is heated

Explanation:
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Q:

Calculate the frequency (in Hz) of a sound wave of wavelength 5 m travelling with a speed of 360 m/s.

A) 1800 B) 36
C) 900 D) 72
 
Answer & Explanation Answer: D) 72

Explanation:
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