JEE Physics Electric Charges and Fields MCQs Set A

Question. If a body has positive charge on it, then it means it has
(a) Lost some electrons
(b) Lost some protons
(c) Process of induction
(d) Attraction between bodies

Answer: A

Question. Sure check for presence of electric charge is
(a) Repulsion between bodies
(b) Frictional force between bodies
(c) Process of induction
(d) Attraction between bodies

Answer: A

Question. If a solid and a hollow conducting sphere have same radius then
(a) Both the spheres will hold same maximum charge
(b) Solid sphere will hold more maximum charge
(c) Hollow sphere will hold more maximum charge
(d) Both the sphere can’t hold charge

Answer: A

Question. When a conducting soap bubble is negatively charged then
(a) It expands
(b) No change in its size takes place
(c) Its size starts varying arbitrarily
(d) It contracts

Answer: A

Question. Five balls marked a to e are suspended using separate threads. Pairs (b, c) and (d, e) show electrostatic repulsion while pairs (a, b), (c, e) and (a, e) show electrostatic attraction. The ball marked a must be
(a) Uncharged
(b) Negatively charged
(c) Positively charged
(d) Any of the above is possible

Answer: A

Question. When a plastic rod rubbed with wool is brought near the knob of a negatively charged gold leaf electroscope, the gold leaves
(a) Dilate
(b) Collapse completely
(c) Contract
(d) Start oscillating

Answer: A

Question. Coulomb’s law is analogous to
(a) Newton’s law of gravitation
(b) Newton’s second law of motion
(c) Charge conservation law
(d) Law of conservation of energy

Answer: A

Question. A charged gold leaf electroscope has its leaves apart by certain amount having enclosed air. When the electroscope is subjected to X-rays, then the leaves
(a) Collapse
(b) Remain unaltered
(c) Start oscillating
(d) Further dilate

Answer: A

Question. Two equal positive charges Q are fixed at points (a, 0) and (–a, 0) on the x-axis. An opposite charge –q at rest is released from point (0, a) on the y-axis. The charge –q will
(a) Execute oscillatory periodic motion but not SHM
(b) Move to origin and rest there
(c) Move to infinity
(d) Undergo SHM about the origin

Answer: A

Question. Which of the following is not true about electric charge?
(a) Charge can be converted into energy and energy can be converted into charge
(b) Net charge on an isolated system is always conserved
(c) Charge is a scalar quantity
(d) Charge on a body is always integral multiple of certain charge known as charge of electron

Answer: A

Question. What is the amount of charge possessed by 1 kg of electrons?
(a) 1.76 × 10¹¹ C
(b) 1.76 × 10^–9 C
(c) 1.76 × 10^–7 C
(d) 1.76 × 10^–5 C

Answer: A

Question. Consider three point objects P, Q and R. P and Q repel each other, while P and R attract. What is the nature of force between Q and R?
(a) Attractive force
(b) Repulsive force
(c) No force
(d) None of these

Answer: A

Question. Which of the following processes involves the principle of electrostatic induction?
(a) All of these
(b) Xerox copying
(c) Chocolate making
(d) Pollination

Answer: A

Question. The electric field intensity at a point in vacuum is equal to
(a) Force a unit positive charge would experience there
(b) Force an electron would experience there
(c) Force a proton would experience there
(d) Zero

Answer: A

Question. In a uniform electric field if a charge is fired in a direction different from the line of electric field then the trajectory of the charge will be a
(a) Parabola
(b) Ellipse
(c) Circle
(d) Straight line

Answer: A

Question. A positively charged pendulum is oscillating in a uniform electric field pointing upwards. Its time period as compared to that when it oscillates without electric field
(a) Is more
(b) Is less
(c) Remains unchanged
(d) Starts fluctuating

Answer: A

Question. How many electrons should be removed from a coin of mas 1.6 g, so that it may float in an electric field of intensity 10⁹ N/C directed upward?
(a) 9.8 × 10⁷
(b) 9.8 × 10⁵
(c) 9.8 × 10³
(d) 9.8 × 10¹

Answer: A

Question. An electron released on the axis of a positively charged ring at a large distance from the centre will
(a) Do oscillatory motion
(b) Do SHM
(c) Do non periodic motion
(d) Not move

Answer: A

Question. An electric dipole placed in a uniform electric field experiences maximum moment of couple when the dipole is placed
(a) Perpendicular to the direction of the field
(b) Against the direction of the field
(c) Towards the electric field
(d) At 135° to the direction of the field

Answer: A