## Tangent law and magnetic instruments- MCQ-Basic

Dear Readers,

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Tangent law and magnetic instruments.You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. The length of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is 2 sec. The magnet is cut along its length into three equal parts and these parts are then placed on each other with their like poles together. The time period of this combination will be

•  2√3 sec
•  2/3 sec
•  2 sec
•  2/√3 sec

2 sec

Q2. In a tangent galvanometer a current of 0.1 A produces a deflection of 30°. The current required to produce a deflection of 60° is

•  0.2 A
•  0.3 A
•  0.4 A
•  0.5 A

0.3 A

Q3. A bar magnet is oscillating in earth's magnetic field with a period T. What happens to its period and motion if its mass is quadrupled

•  Motion remains S.H.M. with the new period = 4T
•  Motion remains S.H.M. with the new period = T/2
•  Motion does not remain S.H.M. and period is approximately constant
•  Motion remains S.H.M. with new period 2T

Motion remains S.H.M. with new period 2T

Q4. A thin rectangular magnet suspended freely has a period of oscillation equal to T. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is T', the ratio T'/T is

•  1/4
•  1/2√2
•  1/2
•  2

1/2

Q5. The period of oscillations of a magnet is 2 sec. When it is remagnetised so that the pole strength is 4 times its period will be

•  4 sec
•  2 sec
•  1 sec
•  1/2 sec

1 sec

Q6. The time period of a thin bar magnet in earth's magnetic field is T. If the magnet is cut into two equal parts perpendicular to its length, the time period of each part in the same field will be

•  T/2
•  T
•  √2T
•  2T

T/2

Q7. The error in measuring the current with a tangent galvanometer is minimum when deflection is about

•  0°
•  30°
•  45°
•  60°

45°

Q8. Two magnets of same size and mass make respectively 10 and 15 oscillations per minute at certain place. The ratio of their magnetic moments is

•  4 : 9
•  9 : 4
•  2 : 3
•  3 : 2

4 : 9

Q9. The time period of a freely suspended magnet is 4 seconds. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will we

•  4 seconds
•  2 seconds
•  0.5 seconds
•  0.25 seconds

2 seconds

Q10. The number of turns and radius of cross-section of the coil of a tangent galvanometer are doubled. The reduction factor K will be

•  K
•  2K
•  4K
•  K/4

K

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