MCQOPTIONS
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MCQOPTIONS
This section includes 24 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
DIRECTIONS: On the basis of following diagram / picture answer the questions given below: In the circuit below, which switch should be left open and which switch should be left closed so that only bulb Y lights up? Switch A Switch B Switch C Switch D |
| A. | Closed Closed Open Open |
| B. | Closed Open Open Closed |
| C. | Chemicals stored inside it. |
| D. | Open Closed Closed Open |
| Answer» D. Open Closed Closed Open | |
| 2. |
DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement 1: The emf of a battery equal the potential difference between its terminals when the terminals are not connected externally. Statement 2: Terminals potential difference can be greater than emf of cell. Statement 3: When current is flowing in circuit then terminal voltage is less than emf of cell. |
| A. | Statement (1) and (3) are incorrect while statement (2) is correct. |
| B. | Statement (1) and (2) are incorrect while (3) is correct. |
| C. | (iii) and (iv) |
| D. | All the statements are incorrect. |
| Answer» D. All the statements are incorrect. | |
| 3. |
Marie conducted an experiment to find out if the number of bulbs arranged in series would affect the brightness of the bulbs. Which of the following variables should be kept the same? A. type of bulbs B. Number of wires C. types of batteries D. Number of bulbs |
| A. | D only |
| B. | B and D only |
| C. | Concave |
| D. | A, B, C and D |
| Answer» D. A, B, C and D | |
| 4. |
The proper representation of series combination of cells obtaining maximum potential is |
| A. | |
| B. | |
| Answer» B. | |
| 5. |
If you bring a magnetic compass near a conducting wire through which current is flowing, what will you observe? |
| A. | It loses magnetism |
| B. | It deflects the magnetic needle |
| C. | Perpendicular |
| D. | The magnetic needle faces in East-west direction |
| Answer» C. Perpendicular | |
| 6. |
Which of the following is not a circuit element? |
| A. | Battery |
| B. | Voltmeter |
| C. | |
| D. | Resistor |
| Answer» D. Resistor | |
| 7. |
The magnetic field around a current carrying coil |
| A. | Lasts for three hours |
| B. | Lasts as long as current flows through it |
| C. | Less, more |
| D. | Is permanent. |
| Answer» C. Less, more | |
| 8. |
DIRECTIONS: On the basis of, following diagram / picture answer the questions given below: Which one is not a source of electric current? A. B. C. D. |
| A. | A |
| B. | B |
| C. | Lamp 1 and 2 will glow together and lamp 3 will glow later. |
| D. | D |
| Answer» E. | |
| 9. |
DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Fuse is a safety device which prevents damages to electrical circuits and possible fires. Reason (R): The fuse wire blows off and breaks the circuit and prevents fire and damage. |
| A. | Both A and R is true and R is the correct explanation of A. |
| B. | Both A and R is true but R is not the correct explanation of A. |
| C. | At a distance less than its focal length. |
| D. | A is false but R is true. |
| Answer» B. Both A and R is true but R is not the correct explanation of A. | |
| 10. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 Some common electrical components can be represented by symbols. It is much easier to draw a circuit diagram using symbols. A circuit diagram of an electrical circuit is shown in the figure below. Look at the diagram and answer the questions. Which part of the circuit diagram represents a bulb? |
| A. | A |
| B. | B |
| C. | Inverted and real |
| D. | None of these |
| Answer» D. None of these | |
| 11. |
Which of these is NOT an insulating material? |
| A. | Sawdust |
| B. | Wool |
| C. | Plane mirror |
| D. | Glass |
| Answer» D. Glass | |
| 12. |
Which appliance does not use an electromagnet? |
| A. | TV. |
| B. | Electric Bell |
| C. | Plane mirror |
| D. | Electric Heater |
| Answer» E. | |
| 13. |
It is a current carrying coil of an insulated wire wrapped around a piece of iron. It is called |
| A. | Electric heater |
| B. | Electromagnet |
| C. | Heat |
| D. | Filament |
| Answer» C. Heat | |
| 14. |
X is a device which prevents damages to electrical circuits and possible fires. Identify X. |
| A. | Electromagnet |
| B. | Fuse |
| C. | Long wire - Low resistance |
| D. | Tube light |
| Answer» C. Long wire - Low resistance | |
| 15. |
What is the material for electric fuse? |
| A. | Cu |
| B. | Constantan |
| C. | Chemical |
| D. | Nichrome |
| Answer» D. Nichrome | |
| 16. |
When the strength of the current flowing through a coil is increased, which of the following statements is true for it? |
| A. | Strength of the magnetic field decreases, |
| B. | Strength of the magnetic field increases, |
| C. | Joule |
| D. | Strength of the magnetic field remains constant, |
| Answer» C. Joule | |
| 17. |
Which of the following appliances does not use an electromagnet? |
| A. | Washing machine |
| B. | Refrigerator |
| C. | Potential difference |
| D. | Electric bell |
| Answer» D. Electric bell | |
| 18. |
When current is passed through a conductor, the heat produced in it depends upon I. The material of the conductor II. The current flowing through the conductor III. The time for which the current flows. |
| A. | I and II only |
| B. | I and III only |
| C. | It can break a circuit, interrupting the current or diverting it from one conductor to another. |
| D. | All I, II and III |
| Answer» E. | |
| 19. |
Electric current is measured by a device called |
| A. | Voltmeter |
| B. | Ammeter |
| C. | (i) Ammonium chloride, (ii) Zinc container, (iii) Carbon rod |
| D. | None of these |
| Answer» C. (i) Ammonium chloride, (ii) Zinc container, (iii) Carbon rod | |
| 20. |
Copper wires are used as connecting wires because |
| A. | Copper has very high melting point |
| B. | Copper wires are very thick wires |
| C. | Iron |
| D. | None of these |
| Answer» D. None of these | |
| 21. |
In which circuit the bulbs will glow brightly? |
| A. | In circuit P only |
| B. | In circuit Q only |
| C. | The bulbs Z and X will glow first |
| D. | Neither P nor Q |
| Answer» D. Neither P nor Q | |
| 22. |
In which circuit will the bulb or bulbs glow the brightest? |
| A. | A simple circuit with one bulb and one cell |
| B. | A simple circuit with one bulb and two cells |
| C. | Both bulbs X and Y will glow |
| D. | A simple circuit with two bulbs and two cells |
| Answer» C. Both bulbs X and Y will glow | |
| 23. |
What happens when a bulb is powered by two cells instead of one in a circuit? |
| A. | The flow of electric current increases. |
| B. | The flow of electric current decreases. |
| C. | Q and R will immediately burnout. |
| D. | The brightness of bulb decreases by half. |
| Answer» B. The flow of electric current decreases. | |
| 24. |
Why does the bulb glow brighter when it is powered by two cells rather than one? |
| A. | The flow of electricity in the circuit is less. |
| B. | The flow of electricity in the circuit is the same. |
| C. | A cell and a switch |
| D. | The flow of electricity fluctuates. |
| Answer» D. The flow of electricity fluctuates. | |