Tick mark the most appropriate answer out of four given options at the end of each of the following statements:
Tick mark the most appropriate answer out of four given options at the end of each of the following statements:
(a) A charged conductor ‘A’ having charge Q is touched to an identical uncharged conductor ‘B’ and removed. Charge left on A after separation will be:
(i) Q (ii) Q/2 (iii) Zero (iv) 2Q.
Ans: – Option (ii).
(b) J C–1 is the unit of
(i) Current (ii) Charge (iii) Resistance (iv) Potential.
Ans: – Option (iv).
(c) Which of the following materials is an electrical insulator?
(i) Mica (ii) Copper (iii) Tungsten (iv) Iron.
Ans: – Option (i).
(d) The device which converts chemical energy into electrical energy is called
(i) Electric fan (ii) Electric generator
(iii) Electric cell (iv) Electric heater.
Ans: – Option (iii).
(e) The resistance of a conductor does not depend on its
(i) Temperature (ii) Length (iii) Thickness (iv) Shape.
Ans: – Option(iv).
(f) There are four resistors of 12 Ω each. Which of the following values ispossible by their combination (series and/or parallel)?
(i) 9 Ω (ii) 16 Ω (iii) 12 Ω (iv) 36Ω.
Ans: – Option (iv).
(g) In case of the circuit shown below in Fig. 16.12, which of the following statements is/are true:
(i) R1, R2, and R3 are in series
(ii) R2 and R3 are in series
(iii) R2 and R3 are in parallel
(iv) The equivalent resistance of the circuit is [R1+ (R2 R3/R2 + R3)].
Ans: – Option (iv).
(h) The equivalent resistance of two resistors of equal resistances connectedin parallel is —— the value of each resistor.
(i) Half (ii) Twice (iii) Same (iv) One fourth.
Ans: – Option(i).
How many types of electric charge exist?
Ans: – There are two types of electric charges exist positive and negative charges.
In a nucleus there are several protons, all of which have positive charge. Why does the electrostatic repulsion fail to push the nucleus apart?
Ans: –In a nucleus there are several protons all of which have positive charge, this electrostatic repulsion fails to push the nucleus because of the strong nuclear force.
What does it mean to say that charge is conserved?
Ans: – Charges is conserved means the positive or the negative charges are placed in a certain places or store in certain area.
A point charge of +3.0 μC is 10 cm apart from a second point charge of–1.5 μC. Find the magnitude and direction of force on each charge.
Ans: – As we know force, F=kq1q2/r^2;
Here, k=9×10^9, q1=+3×10^-6; q2=-1.5×10^-6. R=10cm=0.1m.
So, F=9×10^9× (3×10^-6× -1.5×10^-6 / 0.1)
Or, F= 4.05N.
Name the quantity measured by the unit (a) VC (b) Cs–1.
Ans: – The unit of charge quantity is VC and ampere is measure by Cs^-1.
Give a one-word name for the unit (a) JC–1 (b) Cs–1.
Ans: – Potential difference is measure by JC^-1; and Cs^-1 is measure by current.
What is the potential difference between the terminals of a battery if 250 J of work is required to transfer 20 C of charge from one terminal of the batteryto the other?
Ans: – We know, Q=CV,
Here, Q=250J, C=20c, v=?
So, 250= 20 × V,
V= 12.5volt.
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