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Q:

We are able to walk on earth without slipping because of

A) Gravitational force B) Frictional force
C) Viscous force D) Centrifugal force
 
Answer & Explanation Answer: B) Frictional force

Explanation:
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Q:

In a bipolar junction transistor

A) all the three regions (the emitter, the base and the collector) have equal concentrations of impurity B) the emitter has the least concentration of impurity
C) the collector has the least concentration of impurity D) the base has the least concentration of impurity
 
Answer & Explanation Answer: D) the base has the least concentration of impurity

Explanation:

In terms of concentration of impurity (a.k.a impurity doping concentration, often abbreviated to doping concentration), from the highest to the lowest among the three regions of a bipolar junction, emitter, collector, and base are the correct order. The above order is independent of the type of BJT, npn or pnp

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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:

Filament of electric bulb is made of _____.

A) Magnesium B) Lead
C) Tin D) Tungsten
 
Answer & Explanation Answer: D) Tungsten

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Q:

If you look into a mirror and find that the image (your reflection) is smaller than you, then the type of the mirror is:

A) concave mirror B) convex mirror
C) plano-concave mirror D) plane mirror
 
Answer & Explanation Answer: B) convex mirror

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Q:

If a person moves a trolley for a distance of 10 m with a force of 50 N, then the work done is

A) 0.2 J B) 5 J
C) 20 J D) 500 J
 
Answer & Explanation Answer: D) 500 J

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Q:

Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth _______.

A) remains same B) becomes half
C) becomes twice D) becomes one­-fourth
 
Answer & Explanation Answer: D) becomes one­-fourth

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Q:

1 WH =

A) 360 joules B) 36000 joules
C) 3600 joules D) 36 joules
 
Answer & Explanation Answer: C) 3600 joules

Explanation:

The watt-hour (WH) is a unit of energy equivalent to one watt (1 W) of power expended for one hour (1 h) of time.

1 WH = 3600 joules.

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