PSC MODEL QUESTION PAPER 12

The SI unit of radio activity 
Becquerel

Who made first Barometer 
Torricelli

One calorie = ....joule 
4.2

Approximate speed of sound in normal temperature is ----- meters per second 
340

Escape velosity in moon is kms/second 
2.38

Television signals cannot be received ordinarily beyond a particular distance due to 
curvature of earth

The scientist who first discovered that the earth revolves 
Copernicus

Thee unit of luminous flux 
lumen

sound with frequency above --- db is harmful to ear 
120

optical fibers are related with
communication

A fresh egg sinks in pure water but floats in salt water. 
Saline water is denser than pure water

A good lubricant should have 
high viscosity

Friction can be reduced by changing over form 
sliding to rolling

The colour of the ocean appears  to be blue because the sun-light falling on it is :
scattered

Who discovered electro  magnetic introduction 
Michael Faraday

One knot equals .... meter per second: 
0.514

Ordinary conversation has ----db of intensity
65

One horse power equals --- watts 
746

Photocopier was invented by 
Chester Carlson

Who discovered Tachyons
E.C.G. Sudarshan