Sundial

Q. Statement 1: Adding common salt to distilled water makes it a bad conductor of electricity.
Statement 2: Solutions of acids, bases and salts can conduct electricity.

1. Both the statements are correct.
2. 
   Both the statements are incorrect.
3. Only statement 2 is correct.
4. 
   Only statement 1 is correct.

Q. Which of the following materials cannot be charged by friction?

1. Wool
2. Copper
3. Plastic
4. Glass

Q. Which of the following is true when a comb attracts pieces of paper?

1. both are charged
2. comb is neutral and paper is charged
3. both are neutral
4. Paper is neutral and comb is charged

Q. Paheli wants to electroplate a machine part with zinc. She uses an arrangement as shown in the figure. Select the correct combination of electrodes.

1. A = Zinc plate, B = Machine part
2. A = Machine part, B = Copper plate
3. A = Copper plate, B = Machine part
4. A = Machine part, B = Zinc plate

Q. When a glass rod rubbed with silk is brought near a charged plastic straw rubbed with polythene there is an attraction between the two. Identify the charge on the plastic straw.

1. Can't be predicted

2. Negative

3. Positive

4. Neutral

Q. Assertion (A): An electroscope can be used to find the presence of charge on a body.
Reason (R): It is based on the principle: Like charges repel each other.

1. A is false but R is true
2. Both A and R are true but R is not the correct explanation of A
3. Both A and R are true and R is the correct explanation of A
4. A is true but R is false

Q. Which of the following is true when a comb attracts pieces of paper?

1. both are charged
2. comb is neutral and paper is charged
3. both are neutral
4. Paper is neutral and comb is charged