Physics M.C.Q (1 Marks)

Variation of current and voltage in a conductor has been shown in the diagram below. The resistance of the conductor is

Seven resistances are connected as shown in the figure.  The equivalent resistance between A and B is

When a current I is passed through a wire of constant resistance, it produces a potential difference V across its ends. The graph drawn between log I and log V will be

Variation of current passing through a conductor as the voltage applied across its ends as varied is shown in the adjoining diagram. If the resistance (R) is determined at the points A, B, C and D, we will find that

In the circuit shown below E₁ = 4.0 V, R₁ = 2 W, E₂ =  6.0 V, R₂ = 4 W and R₃ = 2 W.  The current  I₁ is

The potential difference across the 100 W resistance in the following circuit is measured by a voltmeter of 900 W resistance. The percentage error made in reading the potential difference is

In the circuit shown, a meter bridge is in its balanced state.  The meter bridge wire has a resistance 0.1 ohm/cm.  The value of unknown resistance X and the current drawn from the battery of negligible resistance is

If in the circuit shown below, the internal resistance of the battery is 1.5 W and V_P and V_Q are the potentials at P and Q respectively, what is the potential difference between the points P and Q

AB is a potentiometer wire of length 100 cm and its resistance is 10 ohms.  It is connected in series with a resistance R = 40 ohms and a battery of e.m.f. 2 V and negligible internal resistance.  If a source of unknown e.m.f. E is balanced by 40 cm length of the potentiometer wire, the value of E is

Resistance as shown in figure is negative at

In the given circuit, with steady current, the potential drop across the capacitor must be

The V-i graph for a conductor makes an angle θ with V-axis. Here V denotes the voltage and i denotes current. The resistance of conductor is given by

Assertion  :  A person touching a high power line gets stuck with the line.

Reason     : The current carrying wires attract the man towards it.

Assertion   :  The resistance of super-conductor is zero.

Reason      : The super-conductors are used for the transmission of electric power.

Assertion :  Electric field outside the conducting wire which carries a constant current is zero.

Reason    : Net charge on conducting wire is zero.

Assertion :   In meter bridge experiment, a high resistance is always connected in series with a galvanometer.

Reason     : As resistance increases current through the circuit increases.

Assertion   :   Bending a wire does not effect electrical resistance.

Reason       : Resistance of wire is proportional to resistivity of material.

Two wires of equal diameters, of resistivities  and   and lengths l₁ and l₂, respectively, are joined in series.  The equivalent resistivity of the combination is

(a)

(b)

(c)

(d)

In the circuit, the reading of the ammeter is (assume internal resistance of the battery be zero)

In the given current distribution what is the value of I

In the shown circuit, what is the potential difference across A and B

In the circuit shown in figure reading of voltmeter is V₁ when only S₁ is closed, reading of voltmeter is V₂ when only S₂ is closed and reading of voltmeter is V₃ when both S₁ and S₂ are closed. Then

V-i graphs for parallel and series combination of two identical resistors are as shown in figure. Which graph represents parallel combination

In order to quadruple the resistance of a uniform wire, a part of its length was uniformly stretched till the final length of the entire wire was 1.5 times the original length, the part of the wire was fraction equal to

In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10 W is connected in parallel with the battery then it balances on 50 cm length of the potentiometer wire then internal resistance r of the battery is

In the Wheatstone's bridge (shown in figure) X = Y and A > B. The direction of the current between ab will be

In the circuit given E = 6.0 V, R₁ = 100 ohms, R₂ = R₃ = 50 ohms, R₄ = 75 ohms. The equivalent resistance of the circuit, in ohms, is

In the circuit shown in figure, the current drawn from the battery is 4A.  If 10 W resistor is replaced by 20 W resistor, then current drawn from the circuit will be

In a typical Wheatstone network, the resistances in cyclic order are A = 10 W, B = 5 W, C = 4 W and D = 4 W for the bridge to be balanced

A battery of emf 10 V and internal resistance 3Ω is connected to a resistor as shown in the figure.  If the current in the circuit is 0.5 A.  then the resistance of the resistor will be

In the figure, current through the 3 Ω  resistor is 0.8 ampere, then potential drop through 4 Ω  resistor is

In the circuit shown in the figure, the current through

The resistance between the terminal points  A and B of the given infinitely long circuit will be

(a) (

(b) (1 -

(c) (1 +

(d) (2 +

The resistance of a coil is 4.2 Ω at 100 ^oC and the temperature coefficient of resistance of its material is 0.004/^o C.  Its resistance at 0^o C is

Potential difference between the points P and Q in the electric circuit shown is

In the network of resistors shown in the adjoining figure, the equivalent resistance between A and B is

The equivalent resistance of the arrangement of resistances shown in adjoining figure between the points A and B is

Resistances of 6 ohm each are connected in the manner shown in adjoining figure. With the current 0.5 ampere as shown in figure, the potential difference  is

A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true

If each of the resistance of the network shown in the figure is R, the equivalent resistance between A and B is

Two resistance wires on joining in parallel the resultant resistance is .  One of the wire breaks, the effective resistance is 2 ohms.  The resistance of the broken wire is

An infinite sequence of resistance is shown in the figure. The resultant resistance between A and B will be, when   and

The potential difference across 8 ohm resistance is 48 volt as shown in the figure. The value of potential difference across X and Y points will be

The current in the given circuit is

In the adjoining circuit, the battery  has an e.m.f of 12 volt and zero internal resistance while the battery E has an e.m.f  of 2 volt. If the galvanometer G reads zero, then the value of the resistance X in ohm is

Express which of the following setups can be used to verify Ohm’s law

In the given circuit, the voltmeter records 5 volts. The resistance of the voltmeter in ohms is

The figure shows a network of currents. The magnitude of currents is shown here. The current I will be

Potential difference across the terminals of the battery shown in figure is (r = internal resistance of battery)

A moving coil galvanometer of resistance 100  is used as an ammeter using a resistance 0.1 The maximum deflection current in the galvanometer is 100A. Find the minimum current in the circuit so that the ammeter shows maximum deflection