i. Which statement is true about the magnetic poles?




... Answer is (d) a single magnetic pole does not exist
All Magnets have two poles, a north pole, and a south pole. A magnet with a single magnetic pole does not exist


ii. What is the direction of the magnetic field lines inside a bar magnet?




... Answer is (b)  from south pole to north pole
Magnets have two poles, a north pole, and a south pole. The magnetic field is represented by field lines that start at a magnet's north pole and end at the south pole both inside and outside of the bar magnets


iii. The presence of a magnetic field can be detected by a




... Answer is (d) magnetic compass
A magnetic compass is an instrument that is used to find the direction of a magnetic field. This is because the Earth itself has a magnetic field that is similar to that of a bar magnet. The compass needle aligns with the Earth's magnetic field direction and points north-south.


iv. If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire:




... Answer is (a)  increases
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v. According to Coulomb's law, what happens to the attraction of two oppositely charged objects as their distance of separation increases?




... Answer is (b) decrease
According to Coulomb's law "the electrostatic force of Attraction or Repulsion between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the separation distance between them". F=k(Q1.Q2)/r^2 As the Force and Distance between the charges vary inversely So as the distance between charged objects increases, the electrostatic force weakens by the square of their distance.


vi. The Coulomb's law is valid for the charges which are:




... Answer is (c) stationery and point charges
Coulomb’s law is valid if the point charges are at rest. It is difficult to apply Coulomb’s law when the charges are in arbitrary shape. Because we cannot determine the value of distance ‘r’ between the charges when they are in arbitrary shape.


vii. A positive and a negative charge are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is :




... Answer is (d) 16 times larger than before
According to Coulomb’s law, the electrostatic force is inversely proportional to the square of the distance between the charge i.e F ∝ 1/r^2. So if the distance was r = 4 cm before and now r=1 cm, the fore will increase by 16 times than before.


viii. Five joules of work are needed to shift 10 C of charge from one place to another. The potential difference between the places is:




... Answer is (a) 0.5 V
Given: W = work done = 5 Joules q = charge = 10 C To Find: Potential difference V = ? Solution: We Know that W= Vq Or V = W/q V = 5/10 = 1/2 = 0.5 Volts


ix.. Two small charged spheres are separated by 2mm. Which of the following would produce the greatest attractive force?




... Answer is (d) +2q and -2q
Oppositely charged objects attract each other so is in option (d) has two opposite charges
 


x.. Eclectic field lines




... Answer is (b) never cross each other
Electric lines of force never cross each other because if two lines intersect at any point then two tangents can be drawn at one point indicating two directions of the electric field, This means two directions of the electric field at the point of intersection, which is not possible.
 


xi. Capacitance is defined is




... Answer is (b) Q/V
Capacitance is the electrical property of a capacitor to store energy in the form of an electric field between two conducting plates of a capacitor. It is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential. C= Q/V
 


VIP Note: If you have Learned the above MCQs, then examine yourself by taking this Simple MCQS Quiz (Click here to play the Quiz)


 

Unit 15: Electromagnetism
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List of Class:10 MCQs Quizzes

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