NEET 2017 Question Paper - Code B - Mock Test

Two rods A and B of same length and area but different materials are joined in parallel. Their thermal conductivities are $K_1$ and $K_2$. The thermal conductivity of the composite rod will be:

Which one of the following represents forward bias diode?

A $250$ -Turn rectangular coil of area $2.1\text{cm}\times 1.25\text{cm}$ carries a current of $85\mu \text{A}$ and is subjected to a magnetic field of $0.85\text{T}$. Work done for rotating the coil by $180^{\circ }$ from its stable equilibrium position is:

If ${\theta }_1$ and ${\theta }_2$ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta$ is given by:

A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves: