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A. 6.5 – 7
B. 7.5 – 8
C. 8 – 9
D. 4.5 – 5
Answer
Answer
B. 7.5 – 8
Submitted by: Toheed Ahmed
Which one of the following is used as a disinfectant in water treatment?
A. Alum
B. Charcoal
C. Kieselguhr
D. Potassium permanganate
Answer
Answer
D. Potassium permanganate
Submitted by: Toheed Ahmed
Why do the electricians wear rubber gloves while touching wires?
A. With rubber gloves they can hold wires properly.
B. Rubber is a bad conductor of electricity and electrician does not get electricuted.
C. It helps in the smooth flow of the current.
D.None of these
Answer
Answer
B
Submitted by: Toheed Ahmed
How does a lightening conductor protect the buildings?
A. It absorbs the charges released by lightening.
B. It helps the charge to pass into the earth without damaging the building.
C. It scatters the charge from lightening.
D. None of these
Answer
Answer
B
Submitted by: Toheed Ahmed
How does a man die by touching a live wire?
A. The current passes into the earth through the man’s body. As the circuit is complete it burns the body.
B. The current stops the flow of blood through the heart.
C. It affects the nervous system and so kills brain cells.
D. None of these
Answer
Answer
A
Submitted by: Toheed Ahmed
Why are two blankets warmer than one ________?
A. Two blankets have more wool and so warmer
B. Two blankest enclose air which does not allow the cold to penetrate.
C. Two blankets compress the air in between the body and the blankets and this compression produces heat.
D. None of these
Answer
Answer
B
Submitted by: Toheed Ahmed
How does a bulb emit light?
A. As the electricity passes into the bulb its glass begins to shine.
B. As electricity passes in the vaccum of the bulb it changes into heat, so glows.
C. The current passes through a tungsten wire of high resistance which becomes so hot as to glow.
D. None of these
Answer
Answer
C
Submitted by: Toheed Ahmed
Why does boatman push the bank with Pole to make the boat move?
A. When he pushes the bank, the bank pushes him, action and reaction are equal and opposite.
B. The bank cannot move but the boat moves.
C. By pushing the bank he tries to overcome the attraction of the bank for the boat.
D. He pushes the bank to produce waves in the water.
Answer
Answer
A
Submitted by: Toheed Ahmed
When a piece of stone gets hot in fire, it has tendency to fly from it. Why?
A. Heated stone gets the energy which makes it to fly.
B. The outer layer expands before the inner part, so they break due to the unequal expansion.
C. Heated stone breaks because the binding of the elements melt.
D. None of these
Answer
Answer
B
Submitted by: Toheed Ahmed
Why do diamonds shine at night?
A. Diamonds are radioactive so there are radiations.
B. On account of high refractive index the rays of light get internally reflected.
C. Diamonds shine because they have some amount of radium in them.
D. None of these
Answer
Answer
B
Submitted by: Toheed Ahmed