Screw driver and scissor are called ?
A. Simple machines
B. Cutters
C. Lifters
D. Complex machine
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A. Simple machines
B. Cutters
C. Lifters
D. Complex machine
A. Insulator of heat
B. Conductor of heat
C. Conductor of light
D. Insulator of electricity
A. It has silver coated walls
B. It has double walls
C. Heat losses by conduction and radiation are largely prevented
D. Air between the double walls is removed
A. Density of sea water is more than river water
B. River water is moving
C. Sea water has more salinity
D. None of the above
A. Moon has no living things
B. Absence of plants
C. Root mean square of velocity of all gasses is more than their escape velocity on moon’s surface
D. Both A & B
A. They emit light intermittently
B. The earth’s atmosphere absorbs light intermittently
C. The star’s atmosphere absorb light intermittently
D. The refractive index of the air in atmosphere fluctuates
A. High Pressure
B. Low Pressure
C. Absence of Air
D. Its weak gravitational power
A. Oil is very light
B. Oil is volatile
C. Diffusion of oil through the wick
D. Capillary action phenomena
A. It lets the steam escape
B. High pressure rises the boiling point of water
C. High pressure crushes the hard covering of rice grains
D. None of the above