Question

Q.3) Write true or false.
3M
1)One reason of excessive currents in electrical circuits is the direct
touching of wires.
2)The distance time graph for the motion of an object moving with a
constant speed is a curved line.
3)Plane mirror gives virtual and erect image.
Q.4) Complete the following columns.
2M
Column 1
Column 2
1. Hans Forested
a) shaving mirror
2. Electric heater
b) side mirror of vehicle
3. Concave mirror
c) heating effect of electric current
4. Convex mirror
d) magnetic effect of electric current
Q5. Answer the following questions. (Any 3)
ЗМ
1. Write two differences between concave and convex lens
2. Why CFLs are more efficient than incandescent bulbs?
3. What is the use of speedometer in vehicles?
4. What type of mirror can form real image?
Q6 Draw the circuit diagram to represent the circuit showed as below.
2M
Q6. A simple pendulum takes 52 seconds to complete 20 oscillations. What is
the time period of the pendulum?
1M​

Answer 1

Answer:

1. True

2. False

3. True

Q5 1 A convex lens is thicker at the centre and thinner at the edges. A concave lens is thicker at the edges and thinner at the centre. Due to the converging rays, it is called a converging lens. Due to the diverging rays, it is called a diverging lens.

2. CFLs are up to four times more efficient than incandescent bulbs. ... CFLs use 50- to 80-percent less energy than incandescent lights. While initially they cost more, CFLs are less expensive in the long run because they last much longer than incandescent bulbs

3.Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled

4. Concave mirrors can form real images

Q6 picture is given below

2.6 seconds

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