IGCSE Physics Paper-1: Specimen Questions with Answers 38 - 40 of 149
Question 38
Question MCQ▾
Find order of weight of 3 children on the see saw.
Which of the following is correct order of the children՚s weights?
Choices
Choice (4) | |
---|---|
a. | |
b. | |
c. | |
d. |
Answer
d.Explanation
Here from given figure one can conclude that
From first figure in weight Y > Z
From second figure Y > X
And from third figure Z > X
So, from all three results one can write
Question 39
Question MCQ▾
What is the ratio of the primary turns to the secondary turns for a transformer with input 400000 V and output of 20000 V?
Choices
Choice (4) | |
---|---|
a. | 20: 1 |
b. | 1: 20 |
c. | 1: 200 |
d. | 1: 2 |
Answer
a.Explanation
Here and are given.
Primary turn = ,
Secondary turn =
The ratio of turns of primary coils and turns of secondary coil is given as,
Question 40
Question MCQ▾
Hydro-electric power station converts which form of energy?
Choices
Choice (4) | |
---|---|
a. | falling water |
b. | oil |
c. | hot rocks |
d. | waves |
Answer
a.Explanation
The basic principle of hydro-electric is convert kinetic energy to electric energy. And here kinetic energy is obtained from falling water. Thus falling water is the source of energy converted by a hydro-electric power station.