Ammeter

Q. The electrical resistance in ohms of a certain thermometer varies with temperature according to the approximate law:

Q. The resistance of 1 A ammeter is $0.018\Omega$. To convert it into 10 A ammeter, the shunt resistance required will be

1. $0.18\Omega$
2. $0.0018\Omega$
3. $0.002\Omega$
4. $0.12\Omega$

Q. The Galvanometer works on the principle that the angle of turn of the device, $\theta$ is

1. Equal to current
2. Directly proportional to current
3. Inversely proportional to current
4. Inversely proportional to current squared

Q. A milliammeter of range $10\text{mA}$ and resistance $9\Omega$ is joined in a circuit as shown. The meter gives full scale deflection for current $I$ when $A$ and $B$ are used as its terminals. i.e., current enters at $A$ and leaves at $B$ ($C$ is left isolated). The value of $I$ is

1. $100\text{mA}$
2. $900\text{mA}$
3. $1\text{A}$
4. $1.1\text{A}$

Q. The storage battery of a car has an emf of $12\text{V}$. If the internal resistance of the battery is $0.4\Omega$, what is the maximum current that can be drawn from the battery ?

1. $30\text{A}$
2. $20\text{A}$
3. $40\text{A}$
4. $10\text{A}$