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Mechanics : Unit I

Total questions: 50

Worksheet time: 51mins

Name
Class
Date
1.

Vector is a quantity with:

a)

magnitude and direction

b)

magnitude

c)

direction

d)

none of the above

2.

The physical quantities that follow simple laws of algebra are called ....................... physical quantities

a)

Tensor

b)

vector

c)

scalar

d)

None

3.

The physical quantities having only magnitude but no direction are said to be .................. quantities

a)

Scalar

b)

vector

c)

Tensor

d)

Unit

4.
Velocity
a)
Vector
b)
Scalar
5.
Mass
a)
Vector
b)
Scalar
6.
Which of the following quantities are vectors?
a)
speed, velocity, acceleration
b)
velocity, acceleration, force
c)
force, acceleration, mass
d)
length, mass, time
7.

Vector product is also known as dot product

a)

True

b)

False

8.

The result of a scalar product is a scalar

a)

True

b)

False

9.

Gauss's Divergence Theorem relates

a)

Volume and Line Integrals

b)

Surface and Line Integrals

c)

Voulme and Surface Integrals

d)

Any two integrals

10.

We take gradient of

a)

scalar

b)

vector

c)

both scalar and vector

d)

function

11.

we take divergence of a

a)

scalar

b)

vector

c)

both scalar and vector

d)

function

12.

divergence of a vector means

a)

flow of a vector

b)

net flow of a vector over a surface

c)

net flow of a vector from a volume element

d)

outward flow of a vector

13.

curl of a vector means

a)

vorticity or rotation of a scalar

b)

vorticity or rotation of a vector

c)

rotation of a scalar or vector

d)

rotation of any object

14.

Guss's theorem of vector calculus connects

a)

volume integral with surface integral

b)

surface integral of divergence of a vector with volm integral of a scalar

c)

surface integral of divergence of a vector with volm integral of the same vector

d)

surface integral of divergence of a vector with volm integral of a different vector

15.

Surface integral of curl of a vector is connected with its line integral through

a)

Green's theorem

b)

Stoke's theorem

c)

Guass's theorem

d)

Laplace's theorem

16.

Physical meaning of Guss's law of electrostatics is

a)

Net outward flux through a closed surface is equal to charge enclosed by the volume element

b)

Net inward flux through a closed surface is equal to charge enclosed by the volume element

c)

Net outward flux through a closed surface is equal to charge density enclosed

d)

Net flux through a closed surface is equal to charge density enclosed

17.

Differential form of Guass's law is

a)

div.E=0

b)

div.E=charge density/epsilon-0

c)

div.E=charge/epsilon-0

d)

div.E=charge/epsilon of medium

18.

If a charge q is in an electric field E is

a)

qE

b)

qE2

c)

q2E

d)

q/E

19.

Divergence and Curl of a vector field are ___________

a)

Scalar & Scalar

b)

Scalar & Vector

c)

Vector & Vector

d)

Vector & Scalar

20.

Curl is applied on

a)

scalar field

b)

vector field

c)

both of above

21.

Scalar field is

a)

electric filed

b)

magnetic field

c)

electric potential

22.

Stokes' theorem is

a)

surface integral of curl of vector is line integral of vector

b)

surface integral of curl of vector is close line integral of vector

c)

close surface integral of curl of vector is line integral of vector

d)

surface integral vector is close line integral of of curl of vector

23.

The divergence of curl of a vector is

a)

0

b)

1

24.

The curl of gradient of a vector is

a)

0

b)

1

25.

Divergence of gradient of a vector function is equivalent to

a)

a) Laplacian operation

b)

b) Curl operation

c)

c) Double gradient operation

d)

d) Null vector

26.
"For every action, there is an equal and opposite reaction."
a)
Newton's 1st Law
b)
Newton's 2nd Law
c)
Newton's 3rd Law
d)
Newton's 4th Law
27.
Force = Mass x Acceleration
a)
Newton's 1st Law
b)
Newton's 2nd Law
c)
Newton's 3rd Law
d)
Newton's 4th Law
28.
The tendency of an object to resist changes in its motion is...
a)
inertia
b)
force
c)
acceleration
d)
velocity
29.
Any push or pull on an object.
a)
force
b)
velocity 
c)
inertia
d)
momentum
30.
The force that opposes motion between two surfaces in contact with each other.
a)
inertia
b)
friction
c)
momentum
d)
gravity
31.
An object's motion won't change unless acted on by a _________
a)
spell
b)
force
c)
motion
d)
command
32.
A rocket launches because of ______.
a)
its large mass
b)
an opposite reaction
c)
gravity
d)
air resistance
33.
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
a)
Newton's 1st Law
b)
Newton's 2nd Law
c)
Newton's 3rd Law
d)
None of them
34.
Unit of mass
a)
m/s 2
b)
m/s
c)
newtons
d)
kg
35.

When a projectile is falling, it accelerates downward. When a projectile is rising, it accelerates:

a)

downward

b)

upward

c)

equally up and down

d)

there is no acceleration

36.

Projectile motion is defined as the motion of an object that being projected and ____________________________.

a)

moves in space freely under the influence of gravity

b)

moves freely under the influence of constant velocity

c)

moves in space freely under the influence of force

d)

moves freely under the influence of constant acceleration

37.
The more mass an object has, the faster it will fall.
a)
True
b)
False
38.
What is the horizontal acceleration of a projectile?
a)
0 m/s2
b)
9.8 m/s2
39.
What is the vertical acceleration of a projectile?
a)
0 m/s2
b)
9.8 m/s2
40.

Which one is the measure of how much matter an object has?

a)

weight

b)

gravity

c)

mass

d)

volume

41.

Where will be the centre of mass of a uniform rod lies ?

a)

At its end

b)

At its middle point

c)

At its centre of its cross sectional area

d)

Depends upon its material

42.

Center of gravity is usually located where

a)

more weight is concentrated

b)

less weight is concentrated

c)

less mass is concentrated

d)

more mass is concentrated

43.

Center of gravity of an object depends on it's

a)

weight

b)

mass

c)

density

d)

shape

44.

Do all objects have a centre of gravity?

a)

No objects have a centre of gravity

b)

Only some objects have a centre of gravity

c)

Only very heavy objects have a centre of gravity

d)

Yes all objects have a centre of gravity

45.
Any object with mass has gravity.
a)
True
b)
Sometimes
c)
False
d)
Never
46.

Where is the centre of gravity of a ball?

a)

On the outside edge of the ball

b)

A point not touching the ball

c)

The centre of the ball

d)

On the top of the ball

47.

What stops you from standing up when not leaning forward in your chair?

a)

Gravity being too strong

b)

The centre of gravity is moving too much

c)

The chair putting a force on your body

d)

The centre of gravity isn't able to shift

48.
What is gravity?
a)
A force
b)
Energy
c)
A push
d)
All of them
49.
What is mass?
a)
How much MATTER makes up an object.
b)
How much GRAVITY is pulling an object.
50.
A push or pull = Force
a)
True
b)
False

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