Grade 10 Physics Quiz U-5

What is the relationship between resistance, resistivity, conductivity, current density, and drift velocity?

• C) Current density is directly proportional to drift velocity and inversely proportional to resistivity.

• D) Drift velocity is inversely proportional to current density and directly proportional to the number of charge carriers per unit volume.

• B) Conductivity is directly proportional to resistance and inversely proportional to current density.

• A) Resistance is directly proportional to resistivity and inversely proportional to conductivity.

What is the consequence of the law of conservation of charge according to Kirchoff's junction rule?

• D) The total charge at a junction remains constant as charge cannot be created or destroyed.

• C) The total charge at a junction can be different from the total current.

• B) Charge can appear or disappear at a junction.

• A) The total current flowing into a point is equal to the total charge flowing out of a point.

How does Kirchoff's loop rule relate to the conservation of energy?

• D) The sum of the potential differences around any closed loop in a circuit is zero, which aligns with the conservation of energy.

• C) Kirchoff's loop rule is unrelated to the conservation of energy.

• B) Energy is lost in a circuit due to resistance according to Kirchoff's loop rule.

• A) Kirchoff's loop rule states that energy is conserved in a closed loop circuit.

What is the purpose of a shunt resistor in an ammeter or voltmeter?

• D) To eliminate the need for Kirchoff's rules in circuit analysis.

• C) To measure a wide range of currents and potential differences.

• B) To decrease the current flowing through the circuit.

• A) To increase the resistance in the circuit.

What is the significance of Kirchoff's rules in solving circuit problems?

• A) Kirchoff's rules provide a way to ignore resistors in a circuit.

• C) Kirchoff's rules allow for the analysis of complex circuits by applying conservation laws.

• B) Kirchoff's rules help in calculating the speed of drift velocity.

• D) Kirchoff's rules are only applicable to circuits with a single resistor.

What is the principle of Kirchoff's junction rule?

• Total charge going into a point must be less than the total charge going out

• Total charge going into a point must be the same as the total charge going out

• Total charge going into a point must be different from the total charge going out

• Total charge going into a point must be more than the total charge going out

What is the purpose of a Wheatstone bridge?

• To measure the total charge in a circuit

• To measure voltage drop across a component

• To measure resistance accurately

• To measure current flow in a circuit

How can a potential divider circuit be used to measure e.m.f.?

• By measuring the current flow through the circuit

• By measuring the total charge in the circuit

• By measuring the p.d. across known resistances and applying Kirchoff's loop rule

• By measuring the resistance of the circuit components

What is the formula to find the internal resistance of a cell using a potential divider circuit?

• Vd = InqA

• R = V/I

• V = IR

• E = V + Ir

What does Kirchoff's loop rule state in a circuit?

• The sum of the e.m.f is equal to the sum of the p.d.s

• The sum of the e.m.f is less than the sum of the p.d.s

• The sum of the e.m.f is more than the sum of the p.d.s

• The sum of the e.m.f is irrelevant in a circuit