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. The magnetic field lines inside a long, straight solenoid carrying current are:
[1 Mark]
(A) Zero
(B) Circular
(C) Parallel straight lines
(D) Intersecting lines
2. Which rule is used to find the direction of the magnetic field produced by a straight current-carrying conductor?
[1 Mark]
(A) Fleming's Left-Hand Rule
(B) Right-Hand Thumb Rule
(C) Fleming's Right-Hand Rule
(D) Maxwell's Corkscrew Rule
3. Magnetic field lines always emerge from the:
[1 Mark]
(A) South pole and merge at the north pole
(B) North pole and merge at the south pole
(C) Centre of the magnet
(D) Equator of the magnet
4. Which of the following determines the direction of the force experienced by a current-carrying straight conductor placed in a magnetic field?
[1 Mark]
(A) Right-Hand Thumb Rule
(B) Fleming's Left-Hand Rule
(C) Ohm's Law
(D) Faraday's Law
5. The strength of the magnetic field produced by a current-carrying circular coil can be increased by:
[1 Mark]
(A) Decreasing the current
(B) Increasing the radius of the coil
(C) Increasing the number of turns in the coil
(D) Changing the direction of current
6. The core of a strong electromagnet is typically made of:
[1 Mark]
(A) Steel
(B) Soft iron
(C) Copper
(D) Aluminium
7. In domestic electrical circuits, what is the standard colour coding for the Live, Neutral, and Earth wires, respectively?
[1 Mark]
(A) Red, Black, Green
(B) Green, Red, Black
(C) Black, Red, Green
(D) Red, Green, Black
8. What is the frequency of the alternating current (AC) supplied in India?
[1 Mark]
(A) 100 Hz
(B) 60 Hz
(C) 50 Hz
(D) 0 Hz
9. The phenomenon of a short circuit occurs when:
[1 Mark]
(A) The earth wire connects to the live wire.
(B) The live wire and neutral wire come into direct contact.
(C) The voltage drops suddenly.
(D) Too many appliances are connected to one socket.
10. What is the primary function of an electric fuse in a circuit?
[1 Mark]
(A) To increase the current flow.
(B) To provide a path for the current to the ground.
(C) To protect circuits and appliances by stopping the flow of unduly high electric current.
(D) To convert AC to DC.
11. Which device detects the presence of a faint electric current in a circuit?
[1 Mark]
(A) Voltmeter
(B) Galvanometer
(C) Generator
(D) Motor
12. The magnetic field produced around a straight current-carrying wire is in the form of:
[1 Mark]
(A) Concentric circles
(B) Straight lines parallel to the wire
(C) Ellipses
(D) Spirals
13. Why do two magnetic field lines never intersect each other?
[1 Mark]
(A) Because they are physically repelled.
(B) Because they travel at the speed of light.
(C) Because if they did, a compass needle would point in two different directions at the intersection, which is impossible.
(D) Because they are parallel lines.
14. Which property of a proton can change while it moves freely in a magnetic field?
[1 Mark]
(A) Mass
(B) Charge
(C) Velocity
(D) Speed
15. The essential difference between an AC generator and a DC generator is that:
[1 Mark]
(A) AC generator has an electromagnet while a DC generator has a permanent magnet.
(B) DC generator will generate a higher voltage.
(C) AC generator has slip rings while the DC generator has a commutator.
(D) AC generator generates current, DC generates voltage.
16. Connecting too many high-power appliances to a single socket can lead to:
[1 Mark]
(A) Short circuit
(B) Overloading
(C) Voltage drop
(D) Magnetic induction
17. According to Fleming's Left-Hand Rule, what does the middle finger represent?
[1 Mark]
(A) Direction of magnetic field
(B) Direction of force
(C) Direction of motion
(D) Direction of electric current
18. A positively charged particle (alpha particle) projected towards west is deflected towards north by a magnetic field. The direction of the magnetic field is:
[1 Mark]
(A) Towards south
(B) Towards east
(C) Downward
(D) Upward
19. What protects a user from severe electric shocks when using appliances with metallic bodies?
[1 Mark]
(A) Live wire
(B) Neutral wire
(C) Earth wire
(D) Fuse
20. Commercial electric motors do not use:
[1 Mark]
(A) An electromagnet to rotate the armature.
(B) Effectively large number of turns of conducting wire.
(C) A permanent magnet to rotate the armature.
(D) A soft iron core on which the coil is wound.
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