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A. 15 KHz
B. 30 KHz
C. 150 KHz
D. 90 KHz
Answer
Answer
B. 30 KHz
Submitted by: Toheed Ahmed
Video camera is used to convert ___________?
A. Heat into x-rays
B. Sound into electrical signals
C. Electrical signals into pictures
D. Picture into electrical signals
Answer
Answer
D. Picture into electrical signals
Submitted by: Toheed Ahmed
Recording of brain waves from outer surface of head is called
A. E.C.G.
B. C.T. scan
C. E.E.G
D. MRI
Answer
Answer
C. E.E.G
Submitted by: Toheed Ahmed
Ball bearings are used in cycles. scooters, etc. to
A. Reduce the friction between the wheel and the axle
B. Increase the friction between the wheel and
C. Reduce the friction between ground and the wheel
D. None of these
Answer
Answer
A. Reduce the friction between the wheel and the axle
Submitted by: Toheed Ahmed
Steel is more elastic than rubber because
A. Ratio of stress to strain is more
B. It is a metal
C. Ratio of stress to strain is less
D. Its density is high
Answer
Answer
A. Ratio of stress to strain is more
Submitted by: Toheed Ahmed
What does make the blood look red?
A. Red corpuscles
B. Haemoglobin
C. Plasma
D. Certain secretions
Answer
Answer
B. Haemoglobin
Submitted by: Toheed Ahmed
In railway tracks, a small gap is left between the rails
A. To save the cost of metal
B. To allow for the expansion during heat
C. To permit the shrinkage of metal
D. None of the above
Answer
Answer
B. To allow for the expansion during heat
Submitted by: Toheed Ahmed
Friction can be reduced by changing over from
A. Sliding to rolling
B. Rolling to sliding
C. Potential energy to kinetic energy
D. Dynamic to static
Answer
Answer
A. Sliding to rolling
Submitted by: Toheed Ahmed
Ice blocks are covered with sawdust
A. To prevent the dust from collecting on the ice
B. Because ice being cold cannot be lifted with bare hands
C. To provide necessary insulation from heat
D. None of the above
Answer
Answer
C. To provide necessary insulation from heat
Submitted by: Toheed Ahmed
The acid used in a car battery is
A. Hydrochloric acid
B. Nitric acid
C. Sulphuric acid
D. Carbonic acid
Answer
Answer
C. Sulphuric acid
Submitted by: Toheed Ahmed