IGCSE Physics Paper-1: Specimen Questions with Answers 101 - 103 of 149

An electrical component is to be placed in the circuit at X, to allow the brightness of the lamp to be varied from bright to dim. What should be connected at X?

Answer

c.

Explanation

Here in circuit we want the brightness of the lamp to be varied from bright to dim

And for that we have to connect variable resistance because using variable resistance we can very current and then we can control the brightness of lamp.

How many nucleons are in a nucleus of ?

Answer

b.

Explanation

In , 19 represent the number of protons in nucleus, and 39 represent numbers of protons and neutrons in potassium nucleus. Therefore numbers of nucleons in a nucleus of is 39.

A beam of cathode rays passes through an electric field between two parallel plates.

In which direction is the beam deflected?

Answer

c.

Explanation

Cathode rays carries negative charges, so when it passes through two plates as shown in figure positively charged plate attract this beam of cathode rays, therefore it deflected towards the top of the page.