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GRADE VII CDF EXAM

Total questions: 16

Worksheet time: 8mins

Name
Class
Date
1.

The Force which ------------ to the relative motion

a)

opposes

b)

same

c)

both 1 and 2

d)

none

2.

----------------------- is the force acting normal to the surface of the body in outward direction

a)

Normal force

b)

Normal reaction

c)

friction

d)

applied force

3.

---------------- is the force of friction acting on the body ,when its in rest position or some force is being on it

a)

kinetic friction

b)

static friction

c)

both 1 and 2

d)

none

4.

the maximum value of static friction is -----------------

a)

limiting friction

b)

kinetic friction

c)

static friction

d)

both 1 and 2

5.

the force of friction which opposes when the body in motion on the surface of another body, the force of friction acting between two surfaces is called ---------- friction

a)

limiting

b)

static

c)

kinetic

d)

all the above

6.

The force friction which comes into play between two surfaces ,when one tends side over the other is called-----------

a)

rolling

b)

sliding

c)

rotating

d)

none

7.

The force of friction which comes into play between two surfaces, while one is rolling over other is called---------------

a)

Rolling

b)

Static

c)

Rotating

d)

kinetic

8.

The magnitude of limiting friction f is ---------------- to the magnitude of the normal reaction( R) between the two surfaces in contact ..

a)

inversionaly proportional

b)

Directly proportional

c)

both 1 and 2

d)

all the above

9.

A substance which flow is called --------- liquids and gases are considered as-----

a)

solids ,liquids

b)

fluids ,fluids

c)

gases

d)

solids solids

10.

If the part of the fluid is replaced by another object of same volume irrespective of material ,then the ------------- force remains same

a)

buoyant

b)

attraction force

c)

down wards

d)

normal

11.

Buoyant force =

a)

Weight of solid displaced by object

b)

Weight of fluid displaced by object

c)

both 1 and 2

d)

none

12.

Let m mog m_og\   is the weight of the bogy and mfg is the buoyant force
 m0g =Bm0g\ =B  

a)

then the body floats

b)

then the body sinks

c)

then the body suspends

d)

both 1 and 2

13.

 Mog <BM_og\ <B  

a)

THEN THE BODY FLOATS

b)

THEN THE BODY SINKS

c)

THEN THE BODY SUSPENDS

d)

ALL THE ABOVE

14.

 M0g >B ,M_0g\ >B\ ,  

a)

THEN THE BODY SINKS

b)

THEN THE BODY SUSPENDS

c)

BOTH 1 AND 2

d)

NONE

15.

When a body is in motion in the fluid then three develops an opposing force which opposes the motion of the body by the fluid .this force is called -------------

a)

no viscous

b)

viscous drag

c)

friction

d)

all the above

16.

------------------ states that for every action there exists equal and opposite reaction

a)

Newton IInd law

b)

Newton IIIrd law

c)

Newton Ist law

d)

none