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Physics

Physics
Sound becomes hazardous noise pollution at decibels?

Above 120 db
Above 30 db
Above 50 db
Above 80 db

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Physics
Burns caused by steam are much severe than those caused by boiling water because

Steam has latent heat
Steam pierces through the pores of body quickly
Temperature of steam is higher
Steam is gas and engulfs the body quickly

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Physics
In the Earth, the weight of a body is maximum at the

Surface
North Pole
Equator
South Pole

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Physics
Instrument used to study the behaviour of a vibrating string is :

Sonometer
Hydrometer
Hygrometer
Barometer

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Physics
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A vertical straight line
A parabola
A horizontal straight line
A circle

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Physics
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

0.33 km
33 km
3.33 km
1200 m

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