Static Electricity

Static Electricity (O Level)

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Question 1
Which of the following is the unit of charge?
A
Volt
B
Ohm
C
Coulomb
D
Watt
Question 1 Explanation: 
The unit for the quantity of charge is the coulomb.
Question 2
Which of the following point charge will attract each other? 2
A
1 and 2 only
B
1 and 3 only
C
1 and 2, 2 and 3 only
D
1 and 3, 2 and 3 only
Question 2 Explanation: 
Point charge 1 and point charge 3 are positive charges. Point charge 2 is a negative charge. Since unlike charges attract, point charges 1 and 2, and point charges 2 and 3 will attract.
Question 3
An object is negatively charged because
A
it contains only electrons.
B
it contains only protons.
C
it contains more electrons than protons.
D
it contains more protons than electrons.
Question 3 Explanation: 
An object contains both protons and electrons. It will become negatively charged when it gains electrons and contains more electrons than protons.
Question 4
Which of the following is correct?
A
A neutral body does not contain proton and electron.
B
An electrical conductor has particles that are closely bonded.
C
A perfect insulator has no free electrons.
D
A neutral body will not be attracted by a charged body.
Question 4 Explanation: 
A. A neutral body does not contain proton and electron. (Incorrect) A neutral body has equal amount of protons and electrons. B. An electrical conductor has particles that are closely bonded. (Incorrect) An electrical conductor has many free electrons. C. A perfect insulator has no free electrons. (Correct) D. A neutral body will not be attracted by a charged body. (Incorrect) A neutral body can be attracted by both positively charged bodies and negatively charged bodies.
Question 5
A neutral insulator A is rubbed with neutral insulator B. Insulator A becomes positively charged after the rub. What has happened?
A
Insulator A loses some electrons to insulator B.
B
Insulator B loses some electrons to insulator A.
C
Insulator A gains some protons from insulator B.
D
Insulator B gains some protons from insulator A.
Question 5 Explanation: 
Protons are tightly held in the nucleus and too massive to be transferred from one atom to another. An electron has about 1/2000th of the mass of a proton. They can be transferred from one object to another by the effect of friction. Object A loses electrons after the rub and therefore has excessive positive charges. Objects that has excessive positive charges are said to be positively charged.
Question 6
Object A is charged negatively by rubbing it with object B because
A
object A loses electrons.
B
object A gains electrons.
C
object A loses protons.
D
object A gians protons.
Question 6 Explanation: 
Protons are tightly held in the nucleus and too massive to be transferred from one atom to another. An electron has about 1/2000th of the mass of a proton. They can be transferred from one object to another by the effect of friction. Object A gains electrons after the rub and therefore has excessive negative charges. Objects that have excessive negative charges are said to be negatively charged.
Question 7
A positively charged oil drop is suspended in the air by two charged plates as shown. What will happen to the oil drop if the positive charge in it decreases? 7
A
The oil drop will move to either side.
B
The oil drop will move upwards.
C
The oil drop will move downwards.
D
The oil drop will remain stationary.
Question 7 Explanation: 
When the positive charge on the oil drop decreases, there will be less upward force to balance the weight of the oil drop. The oil drop will therefore drop downwards.
Question 8
A positively charged object attracts a suspended light conducting ball. The light conducting ball can be
  1. negatively charged.
  2. neutral.
  3. positively charged.
A
1 only
B
3 only
C
1 and 2 only
D
2 and 3 only
Question 8 Explanation: 
A positively-charged object can attract a negatively-charged object (unlike charges attract). A positively-charged object can also attract a neutral conductor by first attracting the free electrons of the conductors nearer to the side facing the positively-charged object leaving some positive nucleus at the other side. Once the electrons are nearer, the attraction force is stronger than the repulsion force and therefore the two objects attract each other.
Question 9
A negatively charged object attracts a suspended light conducting ball. The light conducting ball can be
  1. negatively charged.
  2. neutral.
  3. positively charged.
A
1 only
B
3 only
C
1 and 2 only
D
2 and 3 only
Question 9 Explanation: 
A negatively-charged object can attract a positively-charged object (unlike charges attract). A negatively-charged object can also attract a neutral conductor by first repelling the free electrons of the conductors further away from the negatively-charged object leaving positive nucleus at the nearer side. Once the electrons are repelled, the attraction force is stronger than the repulsion force. Therefore the two objects attract each other.
Question 10
Which of the following can attract a stream of water?
  1. A negatively charged insulator.
  2. A negatively charged conductor.
  3. A neutral conductor.
A
1 and 2 only
B
1 and 3 only
C
2 and 3 only
D
1, 2 and 3
Question 10 Explanation: 
All charged objects, regardless of the type of charge it carries and its material, can attract a stream of water (neutral). Neutral water cannot attract or repel another neutral object.
Question 11
Which of the following about electric field are correct?
  1. An electron experiences a force when it is placed in an electric field.
  2. Field lines cannot cross each other
  3. Field lines flow from positively charged object to negatively charged object.
A
1 and 2 only
B
1 and 3 only
C
2 and 3 only
D
1, 2 and 3
Question 11 Explanation: 
1. An electron experiences a force when it is placed in an electric field. (Correct) 2. Field lines cannot cross each other (Correct) 3. Field lines flow from positively charged object to negatively charged object. (Correct)
Question 12
An electron is placed near a positive point charge as shown. In which direction will the electron move? 12
A
A
B
B
C
C
D
D
Question 12 Explanation: 
Unlike charges attract. Electron is negatively charged and therefore it will flow towards the positive point charge along the field line.
Question 13
Which of the following are correct?
  1. An electron will accelerate when placed in an electric field.
  2. An electron will always move towards a positively charged object in a straight line.
  3. The direction of an electric field at any point is the direction of the force on a small positive charge placed at the point.
A
1 and 2 only
B
1 and 3 only
C
2 and 3 only
D
1, 2 and 3 only
Question 13 Explanation: 
1. An electron will accelerate when placed in an electric field. (Correct) Any charged object will experience a force in an electric field. When the electron experiences a force, it will accelerate. 2. An electron will always move towards a positively-charged object in a straight line. (Incorrect) The field lines may not be straight. The electron will always flow along a field line. 3. The direction of an electric field at any point is the direction of the force on a small positive charge placed at the point. (Correct) This is the definition of the direction of an electric field.
Question 14
Which of the following is/are possible field pattern(s)? 14
A
1 only
B
3 only
C
1 and 2 only
D
1 and 3 only
Question 14 Explanation: 
Diagram 2 is not possible because the field lines are drawn to be closer when the lines are further away from the sources. The field strength is strong when the field lines are close together. Stronger field is always nearer to the sources. Diagram 3 is not possible because the field lines from positive charge should flow to the negative charge as the two isolated point charges are unlike charges.
Question 15
Which of the following is a possible field pattern? 15
A
A
B
B
C
C
D
D
Question 15 Explanation: 
Field lines must always come out from the positive charge and enter the negative charge.
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