Central Board of Secondary Education · English · Class 10 · Science

A piece of wire of resistance $R$  is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is $R'$ , then the ratio $\frac{R}{R'}$  is:

Which of the following terms does not represent electrical power in a circuit?

An electric bulb is rated $220\text{ V}$  and $100\text{ W}$ . When it is operated on $110\text{ V}$ , the power consumed will be:

The resistivity of a metal wire depends on its:

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be:

Identify the correct representation of the electric field lines of an electric dipole as shown in the physics model below: \n\n

An electric iron of resistance $20\text{ }\Omega$  takes a current of $5\text{ A}$ . The heat developed in $30\text{ s}$  is:

Which of the following represents the unit of electrical energy consumption in a commercial context?

A student plots a graph for the oscillatory behavior of species concentrations in a chemical reaction similar to the BZ reaction as shown below. In a standard electric circuit, such periodic oscillations in voltage are typically produced by what type of source?\n\n

While studying the Simmons-Smith cyclopropanation reaction in chemistry, it is noted that zinc-copper couple is used. In physics, what is the equivalent resistance of two resistors $R_1 = 10\text{ }\Omega$  and $R_2 = 10\text{ }\Omega$  connected in parallel? \n\n

A current of $0.5\text{ A}$  is drawn by a filament of an electric bulb for $10$  minutes. The amount of electric charge that flows through the circuit is:

If the distance between two charges is doubled, then the electrostatic force between them becomes:

How much work is done in moving a charge of $2\text{ C}$  across two points having a potential difference of $12\text{ V}$ ?

The device used for measuring electric current is:

If a wire of resistance $R$  is melted and recast to half of its original length, its new resistance will be: