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Q:

What are the particles emitted by radio active element after 3 consequtive disintegrations?

A) 2 alpha 1 beta B) 1 alpha 1 beta
C) 2 beta 1 alpha D) 2 beta 2 alpha
 
Answer & Explanation Answer: C) 2 beta 1 alpha

Explanation:
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Q:

What type of simple machine is an axe?

A) Lever B) Wedge
C) Both A & B D) The screw
 
Answer & Explanation Answer: C) Both A & B

Explanation:

The simple machine Axe is made up of both the lever arm and a wedge.

                              what_type_of_simple_machine_is_an_axe1536562753.png image

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Q:

The filament of a light bulb is made up of

 

A) Platinum B) Tantalum
C) Tungsten D) Antimony
 
Answer & Explanation Answer: C) Tungsten

Explanation:
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Q:

Earlist thermometerr was developed by

A) Celsius B) Fahrenheit
C) Kelvin D) Galileo
 
Answer & Explanation Answer: D) Galileo

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Q:

Light is a ______________ wave.

 

A) longitudinal B) elastic
C) transverse D) mechanical
 
Answer & Explanation Answer: C) transverse

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Q:

Find the acceleration (in m/s2) produced in a body of mass 2 kg when a force of 8 N is applied on it.

 

A) 4 B) 16
C) 8 D) 32
 
Answer & Explanation Answer: A) 4

Explanation:
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Q:

Speed of sound is maximum in which among the following?

A) Gases B) Vaccum
C) Liquids D) Solids
 
Answer & Explanation Answer: D) Solids

Explanation:

We know that, in solids all the particles are packed together and hence sound can travel from one to one very fast.

 

Hence, speed of sound is maximum in solids and decreses from solids to liquids and liquids to gases. Sound can't travel through vaccum.

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Q:

During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to 

A) remain in the car B) get out of the car and lie flat in the ground
C) abandon the car and take shelter under a nearby tree D) touch the nearest electric pole
 
Answer & Explanation Answer: A) remain in the car

Explanation:

The Whole car  - the body and inside - can be considered to be a hallow conductor. During the thunderstorm the body - i.e, the outside- gets a charge but there will be no charge inside. so the inside is safe.

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