Which of the following types of motion are oscillatory?
i.a diving board when used by a diver.
ii. the motion of the balance wheel of a wrist watch.
iii. the motion of the turn-table of a record player.
iv. the motion of the center of a ten kobo piece as it rolls down an inclined plane.
v. the motion of the needle of a D.C. ammeter into which a low A.C. current is passed
i and ii
i, ii and iii
ii, ii and iv
ii, ii and iv
iii, iv and iv
Correct answer is A
No explanation has been provided for this answer.
i, and iv
ii and iii
ii and iv
i, ii and iii
i and iii
Correct answer is B
- the spring balance works on the principle of Hooke's law while the chemical balance works on the principle of moments.
- The mass of a body is measured using beam or chemical
- Chemical balance is a delicate instrument which is used to weigh small amounts of substances
- The weight of a body can be measured using a spring balance
A simple pendulum with a period of 2.0s has its length doubled. Its new period is
1.00s
1.41s
0.3s
2.83s
4.00s
Correct answer is D
Using T1T2 = √L1L2
2T2 = √L12L1
T2 = 2.83sec
Which of the following is most strongly deflected by magnetic field?
γ - rays
X- particle
β - particles
X - rays
Correct answer is C
No explanation has been provided for this answer.
1.3 x 1015Hz
7.5 x 105Hz
1.2 x 1011Hz
7.5 x 1014Hz
Correct answer is D
F = Vλ
= 3×108400×10−9
= 75 x 1015Hz
= 7.5 x 10^14 Hz