Assertion : The temperature coefficient of resistance is positive… - Vidyadip

MCQ

Assertion : The temperature coefficient of resistance is positive for metals and negative for p-type semiconductor.
Reason : The effective charge carriers in metals are negatively charged whereas in p-type semiconductor they are positively charged.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.
✓
If both assertion and reason are true but reason is not the correct explanation of the assertion.
C
If assertion is true but reason is false.
D
If the assertion and reason both are false.

✓

Answer

Correct option: B.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Current Electricity→Current Electricity — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

A radio receiver antenna that is 2 m long is oriented along the direction of the electromagnetic wave and receives a signal of intensity $5 \times 10^{-16}\ W/m^2$. The maximum instantaneous potential difference across the two ends of the antenna is

When $_{90}T{h^{228}}$ transforms to $_{83}B{i^{212}}$, then the number of the emitted $\alpha$- and $\alpha$- particles is, respectively

A ray of light incidents on a plane mirror at an angle of 30°. The deviation produced in the ray is

The resistance and inductance of series circuit are $5\Omega $ and $20\,H$ respectively. At the instant of closing the switch, the current is increasing at the rate $4\,A-s.$ The supply voltage is.....$V$

If the angles of dip at two places are $30^o$ and $45^o$ respectively, then the ratio of horizontal components of earth's magnetic field at the two places will be

A light beam is travelling from Region $I$ to Region $IV$ (Refer Figure). The refractive index in Regions $I$, $II$, $III$ and $IV$ are $n_0, \frac{n_0}{2}, \frac{n_0}{6}$ and $\frac{n_0}{8}$, respectively. The angle of incidence $\theta$ for which the beam just misses entering Region $IV$ is Figure: $Image$

A man cannot see clearly the objects beyond a distance of $20\, cm$ from his eyes. To see distant objects clearly he must use which kind of lenses and of what focal length

Function of rectifier is

A uniform metallic wire carries a current $2\,A$. when $3.4\,V$ battery is connected across it. The mass of uniform metallic wire is $8.92 \times 10^{-3} \,kg$. density is $8.92 \times 10^3\,kg / m ^3$ and resistivity is $1.7 \times 10^{-8} \Omega- m$. The length of wire is $l=............\,m$

The electric flux on a Gaussian spherical surface of radius 15 cm, drawn with a point charge as the centre, is ф. If the radius of this surface is tripled, then the electric flux passing through the surface will be: