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Q:

Granite is the examples of which rock ?

A) Igneous rock B) Sedimentary rock
C) Calcareous rock D) Matamorphic
 
Answer & Explanation Answer: A) Igneous rock

Explanation:

It forms slow crystallization of magma below Earth's surface.Granite is a hard light-colored igneous rock and it is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles and other minerals it is mainly used for building and monuments

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Q:

The substances which reduce friction are called _________.

A) irregularities B) lubricants
C) adhesives D) viscous
 
Answer & Explanation Answer: B) lubricants

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 odometer guage indicates

A) the distance travelled by a vehicle B) the depth of the ocean
C) pitch length D) frequency of the wave
 
Answer & Explanation Answer: A) the distance travelled by a vehicle

Explanation:

The odometer or the odograph is an instrument used to indicate the distance travelled by the vehicle.

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Q:

An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

A) 6 units B) 600 units
C) 0.6 units D) 60 units
 
Answer & Explanation Answer: A) 6 units

Explanation:
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Q:

Rate at which velocity changes over time?

A) Speed B) Displacement
C) Acceleration D) Jerk
 
Answer & Explanation Answer: C) Acceleration

Explanation:

Acceleration is nothing but the rate at which velocity changes over time.

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Q:

For a certain reaction,DGq = -45 kJ/mol and DHq= -90 kJ/mol at 0°C. What is the minimum temperature at which the reaction will become spontaneous, ifDHq and DSq are independent of temperature?

A) 273 K B) 298 K
C) 546 K D) 596 K
 
Answer & Explanation Answer: C) 546 K

Explanation:

T = 273 °K

Using the formula,

DGq = DHq –TDS

-45 = -90 –273 DS

DS = 0.164

Now since DHq and DSq are independent,T2= DH/DS = 45/0.164 = 273°K

Required Temp = 273 + 273 = 546°K

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Q:

An ideal gas cannot be

A) liquified B) solidified
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) liquified

Explanation:

An ideal gas cannot be liquified because forces between the molecules are negligible.

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