Electricity Class 10 Science MCQ With Solutions

Q.2. The unit of resistivity is

(a) Ohm (b) Ampere
(c) Ohm-Ampere (d) Ohm-metre

Answer

(d): Ohm-metre.

Q.3. When a potential difference is applied across the two ends of the conductor, then an electric field due to applied potential difference exists
(a) outside the conductor
(b) inside the conductor
(c) both outside and inside the conductor
(d) no where.

Answer

(b): When a potential difference is applied across the two ends of a conductor, the electric field exists inside the conductor

Also Check – CBSE Sample Papers Class 10 for 2024 Board Exams

Q.4. If two identical heaters, each rated as 1000 W – 220 V; are connected in parallel to 220 V, then the total power consumed is

(a) 200 W (b) 2500 W
(c) 250 W (d) 2000 W

Answer

(d): In parallel combination , P_p = P₁ + P₂ = 1000 W + 1000 W = 2000 W

Q.5. Electrical resistivity of a given metallic wire depends upon

(a) its length
(b) its thickness
(c) its shape
(d) nature of the material.

Answer

(d): Resistivity of a material is independent of the length, thickness and shape

Q.6. When the temperature of a metallic conductor is increased its resistance

(a) decreases (b) increases
(c) may increase or decrease
(d) remains the same.

Answer

(b)

Q.7. Four resistors of value 4 Ω are connected as shown in the figure. The equivalent resistance between the points A and B is:

(a) 3 Ω
(b) 4 Ω
(c) 6 Ω
(d) 1 Ω

Answer

(a): Here three of the 4 W resistors are connected in series. Therefore, their net resistance = 4 + 4 + 4 = 12 W This combination of resistors are connected parallel to the fourth resistor.

Therefore, equivalent resistance (R) is

Q.8. Three voltmeters all having different resistance are joined as shown. When some potential difference is applied across A and B, then readings in voltmeter are V1, V2 and V3

(a) V1 = V2 (b) V1 < V2
(c) V1 + V2 = V3 (d) V1 + V2 > V3

Answer

(c): The combination of voltmeters V1 and V2 is connected in parallel with voltmeter V3. So option (c) is correct.

CBSE Class 10 Resources – Important Formula Book For 10th Science

Q.9. If p is the heat dissipated per second by a resistor maintained at a constant temperature and q is the potential difference across the resistor, then p is proportional toSelect the incorrect statement stated below related to concave mirror.

(a) q
(b) q²
(c) √q
(d) 1/q

Answer

(b): As we know, H = V² /R t, so, here, p ∝ q²

Q.10. Which of the following graphs represents an ohmic resistance?

Answer

(c): The V-I graph of an ohmic resistance will always be a straight line starting from origin.

CBSE Class 10 Science Electricity MCQs – PDF Download

Answer-

Summary for NCERT class 10 science chapter 11 – “Electricity”

• A stream of electrons moving through a conductor constitutes an electric current. Conventionally, the direction of current is taken opposite to the direction of flow of electrons.
• The SI unit of electric current is ampere.
• To set the electrons in motion in an electric circuit, we use a cell or a battery. A cell generates a potential difference across its terminals. It is measured in volts (V).
• Resistance is a property that resists the flow of electrons in a conductor. It controls the magnitude of the current. The SI unit of resistance is ohm (Ω).
• Ohm’s law: The potential difference across the ends of a resistor is directly proportional to the current through it, provided its temperature remains the same.
• The resistance of a conductor depends directly on its length, inversely on its area of cross-section, and also on the material of the conductor.
• The equivalent resistance of several resistors in series is equal to the sum of their individual resistances.
• The electrical energy dissipated in a resistor is given by W = V × I × t
• The unit of power is watt (W). One watt of power is consumed when 1 A of current flows at a potential difference of 1 V.
• The commercial unit of electrical energy is kilowatt hour (kWh). 1 kW h = 3,600,000 J = 3.6 × 10⁶

Best Reference Books for Class 10 Science

• NCERT Textbook + Exemplar Problems-Solutions
• Foundation Course Physics, Chemistry and Biology
• NCERT at your Fingertips Science
• 100 Percent Science
• CBSE 10 Years Chapterwise Topicwise Solved Papers AKA CBSE Champion
• CBSE Chapterwise Question Bank
• CBSE Score More 15 Sample Question Papers

 

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