Class 10 Exam > Class 10 Notes > Science Class 10 > Unit Test: Electricity
Unit Test: Electricity | Science Class 10 PDF Download
Time: 1 hour
M.M. 30
Attempt all questions.
- Question numbers 1 to 5 carry 1 mark each.
- Question numbers 6 to 8 carry 2 marks each.
- Question numbers 9 to 11 carry 3 marks each.
- Question number 12 & 13 carry 5 marks each.
Q1: When electric current is passed, electrons move from: (1 Mark)
(a) high potential to low potential
(b) low potential to high potential
(c) in the direction of the current
(d) against the direction of the current
Q2: The instrument used for measuring electric current is: (1 Mark)
(a) Ammeter
(b) Galvanometer
(c) Voltmeter
(d) Potentiometer
Q3: The unit of potential difference is __________________. (1 Mark)
Q4: What is the maximum resistance which can be made using five resistors each of 1/5 Ω? (1 mark)
(a) 5 Ω
(b) 10 Ω
(c) 1/5 Ω
(d) 1 Ω
Q5: A piece of wire of resistance R is cut into five equal parts. These parts are then arranged in parallel. If the equivalent resistance of this combination is R′, then the ratio R/R′ is _____. (1 Mark)
(a) 5
(b) 1/5
(c)1/25
(d) 25
Q6: What does an electric circuit mean? (2 Marks)
Q7: Write the relation between the resistance (R) of the filament of a bulb, its power (P) and a constant voltage V applied across it. (2 Marks)
Q8: How does the use of a fuse wire protect electrical appliances? (2 Marks)
Q9: List the three factors on which the resistance of a conductor depends. (3 Marks)
Q10: What is the commercial unit of electrical energy? Represent it in terms of joules. (3 marks)
Q11: If an electric heater rated 800 W operates 6h/day. Find the Cost of energy to operate it for 30 days at ₹3.00 per unit of consumption. (3 Marks)
Q12: What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life. (5 Marks)
Q13: A hot plate of an electric oven connected to a 220 V supply line has two resistance coils such as A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What will be the currents in the three cases? (5 Marks)
You can find the solutions of this Unit Test here: Unit Test (Solutions): Electricity
The document Unit Test: Electricity | Science Class 10 is a part of the Class 10 Course Science Class 10.
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FAQs on Unit Test: Electricity - Science Class 10
| 1. What is electricity and how does it work? |  |
Ans.Electricity is a form of energy resulting from the flow of electric charge, typically through conductors like wires. It works by the movement of electrons, which are negatively charged particles, from one atom to another. When a voltage is applied, it creates an electric field that causes electrons to move and create an electric current.
| 2. What are the different types of electricity? | |
Ans.There are two main types of electricity: direct current (DC) and alternating current (AC). DC electricity flows in one direction and is commonly used in batteries and electronic devices. AC electricity changes direction periodically and is the standard for power supply in homes and industries, allowing for efficient transmission over long distances.
| 3. What are the main sources of electricity? | |
Ans.Electricity can be generated from various sources, including fossil fuels (coal, natural gas, oil), renewable sources (solar, wind, hydroelectric, geothermal), and nuclear energy. Each source has its advantages and environmental impacts, and the choice of source often depends on availability and technology.
| 4. How do we measure electricity? | |
Ans.Electricity is measured in various units. The primary unit of electric current is the ampere (A), voltage is measured in volts (V), and electric power is measured in watts (W). Meters such as ammeters, voltmeters, and wattmeters are used to measure these quantities in electrical circuits.
| 5. What safety precautions should be taken when dealing with electricity? | |
Ans.Safety precautions include always using insulated tools, wearing rubber-soled shoes, and ensuring that electrical systems are grounded. It's also important to avoid working on live circuits, use circuit breakers or fuses to prevent overloads, and follow safety regulations to prevent electrical shocks or fires.
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