IGCSE Physics Paper-1: Specimen Questions with Answers 135 - 138 of 149

Edit

Question

MCQ▾

The diagram shows a wave.

Loading image•••

How many wavelengths are there between X and Y?

Choices

Choice (4)
a.
b.
c.
d.	1

Answer

Explanation

Loading image•••

Total wavelengths =+ 1+

=

=

=

Answer

Explanation

• The temperature at which the substance or solid will get is known as melting point.
• The melting point of pure water is
• And at the temperature the liquid gets evaporate is known as boiling point.
• The boiling point of pure water is

Answer

Explanation

For finding half-life the formula is

In () =-kt

Here,

K =

K = constant and = half life

K =

In () =-kt

In ()

In

t =

t = 45 hrs

(OR)

3 half-lives for sample to decay from 1600g to 200g

I. e.

45hours for 1400g of sodium-24 to decay

Edit

Question

MCQ▾

The circuit shown contains three lamps and 4 switches

Loading image•••

Which switches must be closed to light up lamp1 and lamp3?

Choices

Choice (4)
a.	switch 1,2, 3 and 4 only
b.	switch5 only
c.	switch1, switch2 and switch5 only
d.	switch1 and switch2 only

Answer

Explanation

• The given circuit is a parallel circuit. In a parallel circuit the current passes in a closed path.
• If there is any breakage the current does not flows through it.
• From the circuit, the switch1, switch2 and switch5 must be closed to light the lamp 3.

Loading image•••