2551.What is the unit of electric current?
Answer:- Ampere
2552. Which metal is the best conductor of electricity at room temperature?
Answer:- Silver
2553. If the length of a wire is doubled, what is the change in its resistivity?
Answer:- Remains same
2554. A controlled chain reaction takes place in a ...........
Answer:- Nuclear reactor
2555. How many times the nuclear radius is smaller than atomic radius?
Answer:- 10,000
2556. Which instrument is used to measure the potential difference?
Answer:- Voltmeter
2557. The commonly used safety fuse wire is made of:
Answer:- Alloy of Tin and Lead
2558. If a mirror has a focal length of +10 cm, it is a ..................
Answer:- Concave mirror
2559. Which color is produced by mixing of blue and green?
Answer:- Cyan
2560. For which mirror the image is virtual, erect and small size, whatever the position of the object?
Answer:- Convex
2561.The force of attraction between the molecules of the same substance is .............
Answer:- Cohesive
2562. Ink sticks to paper while writing because .................
Answer:- Force of adhesion
2563. Which substance is used to pour around the ships to calm sea waves?
Answer:- Oil
2564. Which principle is applied in the lift of an aircraft?
Answer:- Bernoulli's principle
2565. A blotting paper absorbs ink because of ...............
Answer:- Capillary action
2566. What energy transfer is happening in a radio?
Answer:- Electrical sound
2567. What form of energy is stored in a battery?
Answer:- Chemical
2568. Which colour is scattered very less?
Answer:-red
2569. What is the approximate voltage produced by power stations?
Answer:- 25,000 v
2570. In all power reactors which chemical is used as control rods?
Answer:- Boron carbide
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