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Physics

Physics
Which of the following waves cannot be polarised?

Infrared
Ultrasonic
Radio
Ultra violet

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Physics
The spring constant of a spring depends on its

Length only
Length and its diameter
Thickness, its diameter and its material
Material only

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Physics
Why does'nt the hydrogen atom emit X-rays?

It has only one electron
Its energy levels are very close to each other
It is highly electropositive
It is very small in size

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Physics
When hot liquid is poured into a thick glass tumbler, it cracks because glass :

Has a very low specific heat
Has high temperature coefficient of expansion
Is a bad conductor of heat so only inner surface expands
Has low temperature coefficient of expansion

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

11.2 km/sec
13.2 km/sec
12.2 km/sec
10.2 km/sec

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Physics
Sun's heat reaches us by

Radiation
Conduction
Convection
Reflection

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MORE MCQ ON Physics

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