When a vehicle passes, TV reception gets distorted. This is because:
- (A) Spark plug creates electromagnetic disturbance
- (B) Metal reflects radio waves
- (C) Passing vehicle affect the sophisticated TV compounds
- (D) Composition of electric devises in TV screen
- (A) Spark plug creates electromagnetic disturbance
Rainbow is formed _______.
- (A) In early mornings
- (B) In late afternoons
- (C) Both (A & B)
- (D) A little before noon
- (C) Both (A & B)
Water is known to be colorless. Snow is frozen water. Then why is snow looks white?
- (A) Ice crystals absorb all colors of light
- (B) Ice crystals reflect all wavelengths of light
- (C) Water when frozen becomes white
- (D) Atmospheric conditions give color to the frozen water
- (B) Ice crystals reflect all wavelengths of light
The color of an opaque object is due to the color it:
- (A) Reflects
- (B) Refracts
- (C) Absorbs
- (D) Scatters
- (A) Reflects
Water kept in earthen pitchers remains cool because:
- (A) Pot water does not come into contact with outside heat
- (B) Of a special clay used in making it
- (C) Clay heats up slowly as also loses coolness slowly
- (D) Pitchers porous build promotes evaporation and consequent cooling
- (D) Pitchers porous build promotes evaporation and consequent cooling
When we blink our eyes, it is to:
- (A) Give rest to the tired eyes
- (B) Give lubrication to the eyes
- (C) Prevent dust from entering the eyes
- (D) Perform an act of habit only
- (B) Give lubrication to the eyes
Food remains unspoiled in refrigerator for a longer time because:
- (A) Germs cannot multiply fast in low temperatures
- (B) Refrigerators contains food preservatives
- (C) The low temperature inside makes the food shrink
- (D) The antibiotics in a refrigerator kill germs
- (A) Germs cannot multiply fast in low temperatures
When milk is churned the cream is separated from it due to:
- (A) Cohesive force
- (B) Centrifugal force
- (C) Frictional force
- (D) Centripetal force
- (B) Centrifugal force
When cream is separated from milk:
- (A) The density of milk increases
- (B) The density of milk decreases
- (C) The density of milk remains constant
- (D) The density of milk reverses
- (A) The density of milk increases
If a boy sitting in a railway train, moving at constant velocity, throw a ball straight up into the air:
- (A) The ball will not return downward
- (B) The ball will fall behind him
- (C) The ball will fall into his hand
- (D) The ball will fall in front of him
- (C) The ball will fall into his hand