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Q:

Soap bubble attains spherical shape due to ______.

A) inertia B) pressure
C) surface tension D) Viscosity
 
Answer & Explanation Answer: C) surface tension

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:

The boiling point of an alcohol is 78°C. What is the temperature in Kelvin scale?

A) 78K B) 341 K
C) 373 K D) 351 K
 
Answer & Explanation Answer: D) 351 K

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Q:

_____ mirror is used in the headlights of cars.

A) Semi-circular B) Conical
C) Convex D) Concave
 
Answer & Explanation Answer: D) Concave

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Q:

Nautical miles is a unit of distance used in

A) Navigation B) Road mile
C) Astronomy D) Measuring the boundaries of a nation
 
Answer & Explanation Answer: A) Navigation

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Q:

1kWH = .........J

A) 3.6×10^-8 B) 3.6×10^-6
C) 3.6×10^8 D) 3.6×10^6
 
Answer & Explanation Answer: D) 3.6×10^6

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Q:

The molecular mass of a gas is ________

A) twice its vapour pressure B) equal to its vapour pressure
C) half its vapour pressure D) not related to its vapour pressure
 
Answer & Explanation Answer: A) twice its vapour pressure

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Q:

Which one of the following statements with regard   to   Jet   stream,   an   upper   level tropospheric wave, is not correct?

A) It is narrow band of high-velocity wind. B) It   follows   the   wave   path   near   the tropopause at elevations of 8 km to 15 km.
C) Jet  streams  are typically  continuous over long distances. D) In summer, the polar front jet achieves its maximum force.
 
Answer & Explanation Answer: B) It   follows   the   wave   path   near   the tropopause at elevations of 8 km to 15 km.

Explanation:

All  are  correct  except  D,  as  Jet streams  are  phenomena  of  winter. It   is   believed   that   jet   stream exercises  an  important  influence on the winter weather in India.

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