An orbiting satellite around the Earth receives centripetal force from:
- (A) The gravitational pull on Moon on the satellite
- (B) The gravitational pull of the Sun on the satellite
- (C) The rocket engine attached to the satellite
- (D) The gravitational pull on Earth on the satellite
- (D) The gravitational pull on Earth on the satellite
A glass chimney stops as oil lamp from smoking because:
- (A) It increases the supply of oxygen to the flame by convection
- (B) The heat produced ensures complete combustion of carbon particles
- (C) Both (A & B)
- (D) It decreases the oxygen supply to the flame by combustion
- (C) Both (A & B)
Why are soft drinks made with chilled water rather than water at room temperature?
- (A) Ingredients dissolve better in chilled water
- (B) Chilled water enhances the taste
- (C) Chilled water attracts more carbon dioxide
- (D) Chilled water is more hygienic
- (C) Chilled water attracts more carbon dioxide
A clear sky is blue because:
- (A) Red light is scattered more than blue
- (B) Ultra violet light has been absorbed
- (C) Blue light is scattered more than red
- (D) Blue light has been absorbed
- (C) Blue light is scattered more than red
An iceberg is floating in sea. How much of its mass will remain above the surface of water?
- (A) On tenth
- (B) One fifth
- (C) One fourth
- (D) One third
- (A) On tenth
The cracking sound heard when dry hair is combed with a hard rubber comb is due to:
- (A) The rubbing of the comb with the hairs
- (B) Small electric sparks
- (C) Large electric sparks
- (D) The hairs barging against the charged comb
- (B) Small electric sparks
Why does ice covered in sawdust not melt quickly?
- (A) Sawdust does not allow the air to touch the ice
- (B) The water is absorbed by sawdust
- (C) Sawdust is bad conductor of heat
- (D) Sawdust is good conductor of heat
- (C) Sawdust is bad conductor of heat
Sea water is saltier than rain water because:
- (A) The air around sea is salty
- (B) Sea animals are salt producing
- (C) Rivers wash away salts from earth and pour them into sea
- (D) Sea beds have salt producing mines
- (C) Rivers wash away salts from earth and pour them into sea
The sky appears blue is due to:
- (A) Rayleigh scattering
- (B) Mie scattering
- (C) Back scattering
- (D) Front scattering
- (A) Rayleigh scattering
A car undergoes a uniform circular motion. The acceleration of the car is:
- (A) Zero
- (B) One
- (C) A non-zero constant
- (D) A non-zero but not a constant
- (D) A non-zero but not a constant