Answer the following questions (any twenty)
20XT
The significant figures of the number 60.023 are- (a) 1, (b) 4. (c) 5, (d) 2.
II)
The dimensional formula of torque is- (a) [ML?T?), (b) [MLT41, () [MLT), (d) [ML“T).
III)
If the error in the measurement of radius of a sphere is 2%, then the error in the determination of the
volume of the sphere will be- (a) 4%, 6)6%, (c) 8%, (d) 2%
iv)
Temperature can be expressed as derived quantity in terms of any of the following-
(a) length and mass, (b) mass and time, (c) length, mass and time, (d) in terms of none.
v
)
Impulse (1) of a force (F) acting on a particle for time t is given by- (a) l=Fxt, (6) I=F/t, (c) I=t/F,
(d) none of these
vi)
The SI unit of moment of inertia is- (a) meter/second, (b) kg meter, (c) kg meter.d) kg/meter
vii)
Which one is not conserved in uniform circular motion? - (a) Kinetic Energy, (b)Velocity Vector,
(©) Angular Velocity, (d) Angular Momentum.
vili)
A 10N force applied on a body to produce in it an acceleration of Im/s2. The mass of the body is-
(a)15 kg, (b) 20 kg, (c) 10 kg (d) 5 kg.
ix
)
The angular velocity of a body moving with a constant speed v in a circle of radius is given by-
(a) v/, (b) vr, (c) v/r. (d) r/v.
x)
An object at rest may have- (a) momentum, (b) potential energy. (c) velocity, (d) kinetic energy.
The recoil of gun after firing a shell is due to the principle of conservation of- (a) mass, (b) linear
momentum, (c) angular momentum, (d) lainetic energy.
XII)
Angular momentum L of body with the moment of inertia I and angular velocity w nd/sec is equal
to-(a) (b) w?, (c) lw (d) none of these.
xili)
Moment of inertia of a thin circular disc of mass M and radius R about any diameter is. (a) MRP,
(b) MR2/4, (C) MR²/2, (d) 2MR.
xiv)
The angular speed of a flywheel making 120 revolutions/minute is-(a) 47 rad/s, (b) 4rr rad/s, (c)
rad/s (d) 2n rad/s.
xv)
Kinetic energy, with any reference, must be- (a) zero, (b) positive, (c) negative, (d) both (b) & (c)
xvi)
Young's modulus is the property of- (a) solids only, 6) solids and liquids, (c) liquids and gases (d)
solids, liquids and gases
xvii)
Lubricants
- (a) Increase friction, (b) Reduce friction, (c) Both (a) & (b), (d) None.
1
Answers
Given : 60.023
To Find : The significant figures of the number 60.023
(a) 1, (b) 4. (c) 5, (d) 2
Solution:
All non-zero digits are significant.
The leftmost nonzero digit is the first or most significant figure.
If there is a decimal point, the rightmost digit is the last or least significant figure
If there is no decimal point explicitly shown, the rightmost non-zero digit is the least significant figure
All digits between the most significant figure and the least significant figure are significant.
60.023
6 is most significant
3 is least significant
all other digits between most significant and least significant are significant
Hence all Digits are significant here
Hence The significant figures of the number 60.023 are 5
Learn More:
significant figures.(A)
brainly.in/question/4628420
Determine the number of significant figures in the following ...
brainly.in/question/4622444
0.00849 contains ______ significant figures.(A) 6 (B)
brainly.in/question/4628364