ACME ACADEMY

WEEKLY EVALUATION TEST

Subject: Science
Time Limit: 20 Mins
Max Marks: 20 Marks
Student Name:
Roll Number:
Class / Sec:
Date:

GENERAL INSTRUCTIONS:

  1. All questions are compulsory. Carefully read all instructions before starting.
  2. The question paper contains 20 questions.
  3. There is no negative marking for incorrect answers.
  4. Use of mobile phones, smartwatches, or calculators is strictly prohibited during the exam.
1. What is the SI unit of electric current?
[1 Mark]
(A) Volt
(B) Ohm
(C) Ampere
(D) Coulomb
2. Which instrument is used to measure the potential difference across two points in a circuit?
[1 Mark]
(A) Ammeter
(B) Voltmeter
(C) Galvanometer
(D) Rheostat
3. According to Ohm's Law, the current flowing through a conductor is directly proportional to the:
[1 Mark]
(A) Resistance of the conductor
(B) Time of flow
(C) Potential difference across its ends
(D) Cross-sectional area
4. How is an ammeter connected in an electric circuit?
[1 Mark]
(A) In parallel
(B) In series
(C) Either in series or parallel
(D) Across the battery terminals only
5. The resistance of a uniform metallic conductor is inversely proportional to its:
[1 Mark]
(A) Length
(B) Temperature
(C) Resistivity
(D) Area of cross-section
6. What happens to the equivalent resistance when several resistors are connected in parallel?
[1 Mark]
(A) It becomes greater than the highest individual resistance.
(B) It equals the sum of the individual resistances.
(C) It becomes less than the lowest individual resistance.
(D) It remains constant.
7. Two resistors of 10 Ω and 15 Ω are connected in series. What is their equivalent resistance?
[1 Mark]
(A) 5 Ω
(B) 6 Ω
(C) 25 Ω
(D) 150 Ω
8. If a wire of resistance R is melted and recast to half its original length, what will be its new resistance?
[1 Mark]
(A) R/2
(B) R/4
(C) 2R
(D) 4R
9. The SI unit of electrical resistivity is:
[1 Mark]
(A) Ohm
(B) Ohm-metre
(C) Ohm per metre
(D) Ampere-metre
10. Joule's law of heating implies that the heat produced in a resistor is directly proportional to the:
[1 Mark]
(A) Square of the current
(B) Square of the resistance
(C) Square root of time
(D) Voltage only
11. Why is tungsten used almost exclusively for filament of electric lamps?
[1 Mark]
(A) It is a very good conductor of electricity.
(B) It has a very low melting point.
(C) It has a very high melting point and does not oxidize easily at high temperatures.
(D) It emits light without any heat.
12. Alloys are commonly used in electrical heating devices like toasters and irons because:
[1 Mark]
(A) They melt very quickly.
(B) They have lower resistivity than pure metals.
(C) They do not oxidise (burn) readily at high temperatures.
(D) They are cheaper than pure metals.
13. 1 kilowatt-hour (kWh) is the commercial unit of electrical energy. It is equal to:
[1 Mark]
(A) 3.6 x 10^5 J
(B) 3.6 x 10^6 J
(C) 3.6 x 10^3 J
(D) 1000 J
14. Which formula correctly represents electric power (P)?
[1 Mark]
(A) P = V/I
(B) P = I² / R
(C) P = V² / R
(D) P = IR
15. An electric bulb is rated 220 V and 100 W. When operated on 110 V, what will be the power consumed?
[1 Mark]
(A) 100 W
(B) 75 W
(C) 50 W
(D) 25 W
16. If the current through a resistor is doubled, the heat produced will become:
[1 Mark]
(A) Half
(B) Double
(C) Four times
(D) One-fourth
17. What is the work done in moving a charge of 2 C across two points having a potential difference of 12 V?
[1 Mark]
(A) 6 J
(B) 14 J
(C) 24 J
(D) 10 J
18. Why are household electrical appliances usually connected in parallel?
[1 Mark]
(A) To increase the total resistance of the circuit.
(B) So that each appliance gets the same current.
(C) So that if one appliance fails, the others continue to work independently.
(D) To save electricity.
19. Which component is used to change the resistance in a circuit without changing the voltage source?
[1 Mark]
(A) Ammeter
(B) Voltmeter
(C) Rheostat (Variable resistor)
(D) Galvanometer
20. In an electric circuit, the direction of conventional current is taken as:
[1 Mark]
(A) The direction of flow of negative charges (electrons)
(B) Opposite to the direction of flow of electrons
(C) From negative terminal to positive terminal
(D) Randomly in any direction
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