Chapter 3 Current Electricity Assertion reason
These questions of two statements each, printed as Assertion and Reason. While answering these Questions you are required to choose any one of the following four responses.
(A) If both Assertion & Reason are true & the Reason is a correct explanation of the Assertion.
(B) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
(C) If Assertion is true but the Reason is false.
(D) If Assertion & Reason both are false.
Q.1 Assertion: When identical cells are connected in parallel to the external load, the effective e.m.f increases.
Reason: All the cells will be sending unequal current to the external load in the same direction.
(1) A (2) B (3) C (4) D
Answer: 4
Q.2 Assertion: Potentiometer is an ideal instrument to measure the potential difference.
Reason: Potential gradient along the potentiometer wire can be made very small.
(1) A (2) B (3) C (4) D
Answer: 2
Q.3 Assertion: An ammeter is always connected in series whereas a voltmeter is connected in parallel.
Reason: An ammeter is a low-resistance galvanometer while a voltmeter is high-resistance galvanometer
(1) A (2) B (3) C (4) D
Answer: 1
Q.4 Assertion: The potentiometer wire is made of manganin.
Reason: For manganin, the temperature coefficient of resistance is almost zero and its resistivity very less.
(1) A (2) B (3) C (4) D
Answer: 1
Q.5 Assertion : Each bulb in a frill of 20 bulbs in series when connected to supply voltage will emit more light than each bulb in frill of 19 bulbs in series when connected to same supply voltage.
Reason : Each bulb in a frill of 20 bulbs in series will get less voltage than that in frill of 19 bulbs.
(1) A (2) B (3) C (4) D
Answer: 4
Q.6 Assertion: When a wire is not connected to battery, then no current is flow.
Reason: Electrons moves randomly or does not move in particular direction.
(1) A (2) B (3) C (4) D
Answer: 1
Q.7 Assertion: Electric field inside a current carrying wire is zero.
Reason: Net charge on wire is non zero.
(1) A (2) B (3) C (4) D
Answer: 4
Q.8 Assertion: A voltmeter must be connected in parallel in a circuit and it should have a high resistance.
Reason: The introduction of the voltmeter in the circuit must not effect the P.D. it is to measure.
(1) A (2) B (3) C (4) D
Answer: 1
Q.9 Assertion: For the same e.m.f. the availability of current from the secondary cell is greater as compared to the primary cell.
Reason: Generally the resistance of secondary cell is less than of primary cell.
(1) A (2) B (3) C (4) D
Answer: 1
Q.10 Assertion: Electric field outside the wire due to steady current carrying wire is zero.
Reason: Net charge present on current carrying wire is zero.
(1) A (2) B (3) C (4) D
Answer: 1
Q.11 Assertion: Kirchhoff’s voltage law indicates that electro static field is conservative.
Reason: Potential difference between two points in a circuit does not depends on path.
(1) A (2) B (3) C (4) D
Answer: 1
Q.12 Assertion: Potentiometer measures correct value of emf of a cell.
Reason: Because no current flows through cell at null point.
(1) A (2) B (3) C (4) D
Answer: 1
Q.13 Assertion: Current is a scalar quantity.
Reason: Electric current arises due to continuous flow of charged particles or ions.
(1) A (2) B (3) C (4) D
Answer: 2
Q.14 Assertion: A larger dry cell has higher emf.
Reason: The emf of a dry cell is proportional to its size.
(1) A (2) B (3) C (4) D
Answer: 4
Q.15 Assertion: The resistance of a copper wire varies directly as the length and diameter.
Reason : Because the resistance varies directly the area of cross-section.
(1) A (2) B (3) C (4) D
Answer: 4
Q.16 Assertion: Terminal potential difference of a cell is always less than its emf.
Reason: Potential drop on internal resistance of cell increases terminal potential difference.
(1) A (2) B (3) C (4) D
Answer: 4
Q.17 Assertion: When Wheatstone bridge is balanced then current through cell depends on resistance of galvanometer.
Reason: At balanced condition current through galvanometer is non zero.
(1) A (2) B (3) C (4) D
Answer: 4
Q.18 Assertion : When cells are connected in parallel to the external load, the effective e.m.f increases.
Reason : Because effective internal resistance of cells decreases.
(1) A (2) B (3) C (4) D
Answer: 4
Q.19 Assertion : The total resistance in series combination of resistors increases and in parallel combination of resistors decreases.
Reason : In series combination of resistors, the effective length of resistors increases and in parallel combination of resistors, the area of cross-section of the resistors increases.
(1) A (2) B (3) C (4) D
Answer: 1
Q.20 Assertion : In parallel combination of electrical appliance, total power consumption is equal to the sum of the powers of the individual appliances.
Reason : In parallel combination, the voltage across each appliance is the same, as required for the proper working of electrical appliance.
(1) A (2) B (3) C (4) D
Answer: 1
Q.21 Assertion : In series combination of electrical bulbs of lower power emits more light than that of higher power bulb.
Reason : The lower power bulb in series gets more current than the higher power bulb.
(1) A (2) B (3) C (4) D
Answer: 3
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