IGCSE Physics Paper-1: Specimen Questions with Answers 99 - 100 of 149

Question 99

Edit

Question

MCQ▾

The circuit shown contains four lamps and three switches.

Circuit diagram consist of three switches and four lamps.

Circuit Diagram Consist of Three Switches and Four Lamps

Loading image

Which switches must be closed to light only lamps 1 and 3?

Choices

Choice (4)
a.switch S2 and switch S3 only
b.switch S1 and switch S3 only
c.switch S1 only
d.switch S1 and switch S2 only

Answer

c.

Explanation

For light only lamp 1 and 3 switch S1 must be closed. As figure shows only switch S1 is must be close for completing the circuit for lamp 1 and lamp 3.

Question 100

Edit

Question

MCQ▾

A straight wire carrying a current produces a magnetic field. Which diagram shows the correct shape of the field?

Choices

Choice (4)
a.
A current carrying wire passing through plane. (Choice a)
Loading image
b.
A current carrying wire passing through plane. (Choice b)
Loading image
c.
A current carrying wire passing through plane. (Choice c)
Loading image
d.
A current carrying wire passing through plane. (Choice d)
Loading image

Answer

d.

Explanation

Magnetic field lines due to straight wire carrying current is always circular and the direction of the magnetic field line is given by right hand rules which is explained as follow,

Right hand rules for current carrying wire and magnetic field

Right Hand Rules for Current Carrying Wire and Magnetic Field

Loading image

The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of your right hand would curl if you wrapped them around the wire with your thumb in the direction of the current.

Choose Paper