10th Class Physics MCQS Chapter 9

The combined resistance of two identical resistors, connected in series is 8?. Their combined resistance in a parallel arrangement will be:

4 ?

12 ?

2 ?

8 ?

When a uranium (92 protons) ejects a beta particle, how many protons are left in the remaining nucleus?

91 protons

93 protons

89 protons

92 protons

Safe limit of radiations exposure in one year.

5 rem

3 rem

4 rem

6 rem

If 2 joules of energy is required to transfer one coulomb of charge from one point to another, the potential difference between these points will be:

4V

1V

6V

2V

earth wire is connected with those appliances whose casing is made of:

wood

glass

plastic

metals

Radiations present in atmosphere due to the presence of different radioactive elements are:

Background radiations

secondary radiations

Cosmic radiations

Electromagnetic radiations

Joule’s law is W=

IRt²

IR/t

IR²t

I²Rt

the range of galvanometer to measure current is:

few amperes

few micro amperes

few milli amperes

mega amperes

What happen to the atomic number of an element which emits one alpha particle and a beta particles.

Decrease by 1

Decrease by 2

Stay the same

Increases by 1

by connecting suitable high resistance in series with galvanometer it will convert into:

multimeter

ammeter

voltmeter

galvanometer