Test Details

Electricity

Physics

Jan 23, 9:00 AM

30 minutes

Jan 23, 9:30 AM

40.0 marks

MCQ

20 questions

IMRAN AHMAD

I am simple person. I believe in God.

Class Details

Science

10th

Science

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Question Text

Question 1 :
Which among iron and mercury is a better conductor? If resistivity of iron is $10.0 × 10^{–8}$ Ω m and resistivity of mercury is $94.0 × 10^{–8}$ Ω m.

Question 2 :
The resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

Question 3 :
An electric bulb is connected to a 220 V generator. The current is 0.50 A. What is the power of the bulb?

Question 4 :
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 $\Omega$ resistance. What is the current when they are used in series?

Question 5 :
What determines the rate at which energy is delivered by a current?

Question 6 :
Resistance of a metal wire of length 1 m is 26 Ω at 20°C. If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature?

Question 7 :
An electric motor takes 5 A from a 220 V line. Determine the energy consumed in 2 h.

Question 8 :
What is the minimum resistance which can be made using five resistors each of $\frac{1}{5}\Omega$ ?

Question 9 :
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. What is the value of the resistance of the resistor?

Question 10 :
What is the commercial unit of electrical energy (Represent it in terms of joules) ?

Question 11 :
What is the highest total resistance that can be secured by combinations of four coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω?

Question 14 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d32273b230584979bbb.PNG' /> Above image is the symbol of ______ in circuit diagram.

Question 16 :
A circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω resistor, and a 12 Ω resistor, and a plug key, all connected in series. If the voltmeter is connected across 12 Ω resistor,what would be the readings in voltmeter?

Question 17 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d73273b230584979c07.PNG' /> In the above image, Which among iron and mercury is a better conductor?

Question 18 :
Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Question 19 :
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 $\Omega$ resistance. What is the current when they are used separately?

Question 20 :
Two lamps, one rated at 100W-220 V and other 60 W-220 V are connected in parallel to electric mains supply. What current is drawn from the line, if supply voltage is 220 V ?

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