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 Physics Questions

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Q:

If an object moves with constant velocity,

A) it must have constant speed B) it must have constant direction
C) it must have constant speed in constant direction D) None of the above
 
Answer & Explanation Answer: C) it must have constant speed in constant direction

Explanation:
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Q:

Find the resistance (in mega Ω) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200 Ωm.

A) 40 B) 4000
C) 80 D) 2000
 
Answer & Explanation Answer: A) 40

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3 1620
Q:

Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is

A) of variable refractive index B) made up of slabs of different refractive indices
C) homogeneous and transparent D) inhomogeneous and transparent
 
Answer & Explanation Answer: C) homogeneous and transparent

Explanation:

In vacuum and in homogeneous, transparent media, such as air, water, and glass, light moves in a straight line. When light encounters a boundary between two different transparent media, some light is reflected and some moves from the first into the second medium.

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1 1618
Q:

Speed of light is maximum in _____.

A) vacuum B) solids
C) liquids D) gases
 
Answer & Explanation Answer: A) vacuum

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3 1617
Q:

The least penetrating power ray is

A) Gamma rays B) Beta rays
C) Alpha rays D) None of the above
 
Answer & Explanation Answer: C) Alpha rays

Explanation:

The least penetrating power ray is Alpha rays.

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1 1616
Q:

If electric resistance is to be decreased, then the number of resistances should be connected in ________________

A) Series B) Parallel
C) Mixed arrangement D) None of these
 
Answer & Explanation Answer: B) Parallel

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0 1611
Q:

What is the escape velocity of the rocket in the earth is?

A) 12.2 km/sec B) 10.2 km/sec
C) 13.2 km/sec D) 11.2 km/sec
 
Answer & Explanation Answer: D) 11.2 km/sec

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2 1604
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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