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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:

If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?

A) lUV < lIR < lVIS B) lUV > lVIS > lIR
C) lUV > lIR > lVIS D) lUV < lVIS < lIR
 
Answer & Explanation Answer: D) lUV < lVIS < lIR

Explanation:

Infrared radiation, what we experience as heat when we hold our hand near a warm object, is somewhat longer wavelengths than visible light. Visible light is simply electromagnetic radiation in a range of wavelengths that our eyes are sensitive to. Visible wavelengths range from 0.0007 milimeters for red light, through orange, yellow, green, and blue, to 0.0004 milimeters for violet light. Ultraviolet is shorter wavelengths than violet.

Longer the wavelength,lower the energy

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Q:

The washing machine works on the principle of ____________

A) Dialysis B) Diffusion
C) Reverse osmosis D) Centrifugation
 
Answer & Explanation Answer: D) Centrifugation

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Q:

If the Distance-Time graph is a straight inclined line then it represents _______________.

A) uniform speed B) non-uniform speed
C) constant displacement   D) non-uniform velocity
 
Answer & Explanation Answer: A) uniform speed

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Q:

The basic Speed Law means

Answer

The Basic Speed Law states that you must never drive faster than is safe for present conditions, regardless of the posted speed limit.


For example, if you are driving 60 kmph in 45 kmph zone, you are not in safe driving and you just not following the speed law.

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Q:

What is the process of conversion of solid state directly to gaseous state called?

A) Evaporation B) Condensation
C) Sublimation D) Distillation
 
Answer & Explanation Answer: C) Sublimation

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Q:

When light passes from one medium to another, this phenomenon of change in its direction is called _____.

A) Refraction B) Diffraction
C) Propagation D) No option is correct
 
Answer & Explanation Answer: A) Refraction

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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

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