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A. Ascorbic acid
B. Formic acid
C. Acetic acid
D. Riboflavin
Answer
A. Ascorbic acid
Submitted by: Toheed Ahmed
Lightning flash and thunderbolt occur at one and the same time.
A. The light is seen first and sound is heard afterwards
B. Sometimes light is seen first and sometimes sound is heard first
C. The sound is heard at the same time as the light is seen
D. The light is seen after the sound is heard
Answer
A. The light is seen first and sound is heard afterwards
Submitted by: Toheed Ahmed
Which of the following pairs is not correct?
A. Helicopter — Brequet
C. Telescope — Galileo
D. Barometer — Torricelli
Answer
B. Aeroplane — Barthelemy
Submitted by: Toheed Ahmed
As the amount of clay in a soil increases, its water retaining capacity
A. Increases
B. Decreases
C. Remains unchanged
D. None of these
Answer
A. Increases
Submitted by: Toheed Ahmed
The most abundant element in Earth’s crust is __________?
A. Silicon
B. Oxygen
C. Aluminium
D. Calcium
Answer
B. Oxygen
Submitted by: Toheed Ahmed
What is the instrument that determines specific gravity of liquids?
A. Hygrometer
B. Hydrometer
C. Gravimeter
D. Hypsometer
Answer
C. Gravimeter
Submitted by: Toheed Ahmed
Convex lenses are used for the correction of
A. Long-sightedness
B. Short-sightedness
C. Cataract
D. None of these
Answer
A. Long-sightedness
Submitted by: Toheed Ahmed
A transformer is used to _________?
A. Increase DC voltage
B. Increase or decrease AC voltage
C. Decrease DC voltage
D. Convert DC into AC
Answer
B. Increase or decrease AC voltage
Submitted by: Toheed Ahmed
Astronauts cannot talk to each other on the surface of the moon because _________?
A. Sound waves are absorbed
B. There are obstructions to the sound waves
C. Sound waves cannot travel through vaccum
D. The temperature is high near the moon’s surface
Answer
C. Sound waves cannot travel through vaccum
Submitted by: Toheed Ahmed
Brass is an alloy of __________?
A. Copper and Tin
B. Copper and Zinc
C. Copper and Nickel
D. Aluminium and Magnesium
Answer
B. Copper and Zinc
Submitted by: Toheed Ahmed