Question

Nearly all the clocks make use of *
(a) straight line motion
(b) periodic motion
(c) random motion
(d) circular motion

A simple pendulum takes 42 sec. to complete 20 oscillations. What is its time period? *
a) 2.1 s
(b) 4.2 s
(c) 21 s
(d) 8.40 s

The correct symbol to represent the speed of an object is: *
(a) 5 m/s
(b) 5 mp
(c) 5 m/s-1
(d) 5 s/m

In a simple pendulum, the metallic ball suspended by thread is called its ………………… *
Ball
Bob
Metallic ring
None of the above

Convert 72km/h into m/s
10 m/s
20m/s
15m/s
30m/s

A bus travels 54m in 90 seconds. The speed of the bus is
a) 0.6 m/s
(b) 10 m/s
(c) 5.4 m/s
(d) 3.6 m/s

Which one of the following is based on the heating effect of current? *
a) Geyser
(b) Hair dryer
(c) Immersion rod
(d) All of these

The coil of wire contained in an electric heater is known as *
a) component
(b) element
(c) circuit
(d) spring

The amount of heat produced in a wire depends on *
a) material
(b) length
(c) thickness
(d) all of these

Which mark is necessary on electric appliances *
a) AGMARK
(b) ISI
(c) FICCI
(d) KSK

The basic unit of speed is km/h. *
True
False

. A ………………….. is a safety device which prevents damages to electrical circuits and possible fires.
Filament
Fuse
Element
Compass needle

Crane has a strong
………………….. attached to it.
Gong
Electromagnet
Coil
Element

Faster vehicle has a higher speed. *
True
False

MCBs are the switches which automatically turn off when current in a circuit exceeds the safe limit. *

True
False​

Answer 1

Answer:

1 answer is a

Explanation:

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