10th Standard Science Chapter 12

Question 1.
Which of the following represents voltage?

Question 2.
Unit of electric power may also be expressed as

Q3. When a 4 Ω resistor is connected across the terminals of a 2 V battery, the number of coulombs passing through the resistor per second is:

Q4. Keeping the potential difference constant, the resistance of the circuit is halved. The current will become:

Q5. If in the given arrangement, the three resistors are to be replaced by a single resistor. What will be the value of this resistor?

Q6. The potential difference across the 3 Ω resistor in the following diagram is:

Q6. The potential difference across the 3 Ω resistor in the following diagram is:

Q7. V₁, V₂ and V₃ are the potential differences across the 1Ω, 2Ω and 3Ω resistors in the following diagram, and the current is 5A.

Which of the following shows the correct values of V₁, V₂ and V₃ measured in volts?

Q8. A wire of resistance R₁ is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R₂, then the ratio R₁/ R₂ is:

Q10. When a current 'I' flows through a resistance 'R' for time 't' the electrical energy spent is given by