CBSE Class 10 Science 2020 · Paper 31/3/1 · Question 14
Note : For question numbers 13 and 14, two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below :
Assertion (A): Alloys are commonly used in electrical heating devices like electric iron and heater.
Reason (R): Resistivity of an alloy is generally higher than that of its constituent metals but the alloys have low melting points then their constituent metals.
- (a)Both (A) and (R) are true and (R) is correct explanation of the assertion.
- (b)Both (A) and (R) are true but (R) is not the correct explanation of the assertion.
- (c)(A) is true but (R) is false.
- (d)(A) is false but (R) is true.
Answer
(b) Both (A) and (R) are true but (R) is not the correct explanation of the assertion.
🔒 Step-by-step solution
Sign up free to see every step of how it is worked out.
From the board papers
More questions from Electricity
Class 10 Science — every question with an expert-verified, step-by-step solution.
- Q1 A piece of wire of resistance R is cut into five equal parts. These…
- Q1 What does an electric circuit mean?
- Q2 Which of the following terms does not represent electrical power …
- Q2 Define the unit of current.
- Q3 An electric bulb is rated 220 V and 100 W. When it is operated on…
- Q3 Calculate the number of electrons constituting one coulomb of c…
- Q4 Two conducting wires of the same material and of equal lengths and…
- Q5 How is a voltmeter connected in the circuit to measure the pote…
- Q6 A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10⁻⁸ Ω m…
- Q7 The values of current I flowing in a given resistor for the corresp…
- Q8 When a 12 V battery is connected across an unknown resistor, there i…
- Q9 A battery of 9 V is connected in series with resistors of 0.2 Ω,…
All 363 questions on Electricity → Browse all Science chapters →