The colour code on a carbon resistor is red - red - black. The resistance of the resistor is ___________.

(a)

\(2.2\Omega \)

(b)

\(22\Omega \)

(c)

\(220\quad 2.2\Omega \)

(d)

\(2.2k\Omega \)

The electrical resistivity of a thin copper wire and a thick copper wire are respectively \({ P }_{ 1 }\Omega \) m and \({ P }_{ 2 }\Omega \) m Then_____________.

(a)

\({ P }_{ 1 }>{ P }_{ 2 }\)

(b)

\({ P }_{ 2 }>{ P }_{ 1 }\)

(c)

\({ P }_{ 1 }={ P }_{ 2 }\)

(d)

\(\cfrac { { P }_{ 1 } }{ { P }_{ 2 } } \)

When 'n' resistors of equal resistance (R) are connected in series and in parallel respectively, then the ratio of their effective resistance is ______________

(a)

1: n²

(b)

n²: 1

(c)

n: 1

(d)

1: n

Which of the following has negative temperature coefficient of resistance?

(a)

copper

(b)

tungsten

(c)

carbon

(d)

silver

The temperature co-efficient of resistance for alloys is _____________.

(a)

low

(b)

very low

(c)

high

(d)

very high

Which of the following material has the highest specific resistance?

(a)

rubber

(b)

silver

(c)

germanium

(d)

glass

Temperature co-effieient of resistance for metals is ______________.

(a)

constant

(b)

positive

(c)

zero

(d)

negative

An electron gun in a TV shoots out a beam of electrons. The beam current is 10\(\mu\)A. The charge that strikes the screen in 1 minute is ______________.

(a)

\(+600\mu C\)

(b)

\(-600\mu C\)

(c)

\(+10\mu C\)

(d)

\(-10\mu C\)

If the specific resistance of a potentiometer wire is 10^-7 Om and current flowing through it is 0.1 amp, cross-sectional area of wire is 10^-6 m², then potential gradient will be ________________.

(a)

10^-2 v/m

(b)

10^-4 v/m

(c)

10^-6 v/m

(d)

10^-8v/m

A metallic block has no potential difference applied across it, then the mean velocity of free electrons is _____________.

(a)

proportional to T

(b)

proportional for \(\sqrt { T } \)

(c)

finite but independent of temperature

(d)

zero

In an electrical arrangement as shown the equivalent resistance between X and Y will be

(a)

\(158.75\Omega \)

(b)

\(118.75\Omega \)

(c)

\(218.75\Omega \)

(d)

\(318.75\Omega \)

The emf of a battery is 3 volts and internal resistance 0.125 \(\Omega \) . The difference of potential at the terminal of battery when connected across an external resistance of 1 \(\Omega \) is ______________.

(a)

1.67 V

(b)

0.67 V

(c)

2.67 V

(d)

3.67 V

A square aluminum rod is 1 m long and 5 mm on edge. What must be the radius of another aluminum rod whose length is 1 m and which has the same resistance as that of square Aluminum rod?

(a)

1.4 mm

(b)

2.8 mm

(c)

4.2 mm

(d)

5.6 mm

Four resistances are connected to a 5V battery of negligible internal resistance as shown what is the potential across \(2\Omega \)?

(a)

0.5 V

(b)

1:5 V

(c)

1.0 V

(d)

1.0 V

An unknown resistance is connected in parallel with a 15\(\Omega \) resistance and a 12V battery. What is the value of the unknown resistance if the current in the circuit is 2A?

(a)

\(10\Omega \)

(b)

\(20\Omega \)

(c)

\(30\Omega \)

(d)

\(40\Omega \)