Question 1
What is the reading shown by the pointer in the figure below, if the full scale range is
a) 0 - 2.5
b) 0 – 5
Answer
a) 1.85 mA
b) 3.7 mA
b) 3.7 mA
Question 2
The following diagram shows two mirrors inclined at an angle to each other. A ray of light is incident on one of the mirrors and finally reflected from the second mirror parallel to the first mirror find the angle between the mirrors.
Answer
Question 3
It is not possible to charge an electroscope by contact method using a metal rod. Explain
Answer
- metal is a good conductor of charges
- causes earthing of the electroscope
- causes earthing of the electroscope
Question 4
A car battery is rated 40 Ah and it is expected to supply a constant current for 120 minutes
a) What is the strength of the current delivered
b) Explain why eight dry cells in series cannot be used to start a car engine even though they have the same e.m.f.
Answer
a)
b) Increased internal resistance by combining cells in series, leads to insufficient current to start the car engine
b) Increased internal resistance by combining cells in series, leads to insufficient current to start the car engine
Question 5
A coil of insulated wire is wound around a u – shaped soft iron core X Y and connected to a battery as shown below
State the polarities of the ends X and Y.
Answer
X – North
Y – South
Y – South