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A. Quartz crystal
B. Titanium needle
C. Barium titanate ceramic
D. Laser beam
Answer
Answer
D. Laser beam
Submitted by: Toheed Ahmed
When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
A. Reflection and transmission
B. Reflection and diffraction
C. Diffraction and transmission
D. Refraction, diffraction and transmission
Answer
Answer
B. Reflection and diffraction
Submitted by: Toheed Ahmed
If a U-238 nucleus splits into two identical parts, the two nuclei so produced will be
A. Stable
B. Isobars
C. Isotopes
D. Radioactive
Answer
Answer
D. Radioactive
Submitted by: Toheed Ahmed
Which of the following types radiations is absorbed by the upper layer of the atmosphere?
A. Radio-waves
B. Infrared
C. Ultraviolet
D. Visible
Answer
Answer
B. Infrared
Submitted by: Toheed Ahmed
After long periods of use. a gray spot develops on the inside of a bulb. This is because
A. The tungsten filament evaporates and collects there
B. Glass undergoes a change due to the heat
C. The heat of the bulb scorches the glass at the top
D. Dust inside the bulb condenses on the top
Answer
Answer
A. The tungsten filament evaporates and collects there
Submitted by: Toheed Ahmed
Approximately, how many times each day do our heart valves open and close normally?
A. 10,000
B. 1,00,000
C. 2,00,000
D. 1,50,000
Answer
Answer
B. 1,00,000
Submitted by: Toheed Ahmed
A nuclear reactor harnesses nuclear energy by
A. Nuclear fusion
B. Spontaneous fission
C. Controlled chain reaction
D. Uncontrolled chain reaction
Answer
Answer
C. Controlled chain reaction
Submitted by: Toheed Ahmed
Which one of the following raw material is used in the manufacture of foam used in mattresses, cushions, etc.?
A. Methanol
B. Ethanol
C. Urea
D. Phenol
Answer
Answer
D. Phenol
Submitted by: Toheed Ahmed
Permanent magnets can be made from
A. Cobalt
B. Lead
C. Zinc
D. Aluminium
Answer
Answer
A. Cobalt
Submitted by: Toheed Ahmed
Atmospheric pressure exerted on the earth is due to the
A. Gravitational pul
B. Rotation of the earth
C. Revolution of the earth
D. Uneven heating of the earth
Answer
Answer
A. Gravitational pul
Submitted by: Toheed Ahmed