IX Sem I Science 1 Test

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A voltmeter is used to measure current.

1 point

True

False

Clear selection

............... is an example of negative acceleration.

1 point

A coin thrown vertically upwards

A coin falls freely towards the earth

A train starting from the station

An object is speeding up.

Clear selection

The number of molecules in a given quantity of a substance is determined by its ...............

1 point

atomic mass

molecular mass

uniﬁed mass

option a & b

Clear selection

A body at rest may possess energy.

1 point

True

False

Clear selection

Full Name *

3 points

Describes the relationship between the forces on two interacting object

Also called the law of inertia

Gives the idea of effects of force

Newton’s ﬁrst law of motion.

Newton’s second law of motion

Newton’s third law of motion

Clear selection

Joule is the unit of ................

1 point

force

work

power

both (b) and (c)

Clear selection

Energy is a cause of work.

1 point

True

False

Clear selection

Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?

2 points

3 J

4 J

2 J

Clear selection

Cationic radicals are also called ............... radicals.

1 point

acidic

neutral

basic

all the above

Clear selection

In atom electrons moving in the ...............

1 point

nucleus

extra-nuclear part

centre of an atom

none of the above

Clear selection

What is the potential energy of the body of 5kg, when it is lifted through 20m?

2 points

980 J

890 J

20J

100J

Clear selection

2 points

Volt

Ampere (A)

Coulomb (C)

Electric current

Electric charge

Clear selection

Instead of relative mass, ............... has now been accepted as the unit of atomic mass.

1 point

unit mass

molecular mass

uniﬁed mass

option a & b

Clear selection

............... discovered that water is made up of hydrogen and oxygen.

1 point

Antoine Lavoiser

Proust

Avogadro

Newton

Clear selection

If a person is throwing some object, work done by him is negative.

1 point

Yes

Maybe

Clear selection

4 points

mgh

½ mv2

W / t

F. s

Kinetic energy

Work

Potential energy

Power

Clear selection

2 points

negatively charged

neutral charge

positively charge

Protons

Electrons

Clear selection

Number of molecules is same in equal weights of different substances.

1 point

True

False

Clear selection

The work done on an object does not depend on ............... .

1 point

displacement

applied force

initial velocity of the object

the angle between force and displacement.

Clear selection

Positive acceleration is called deceleration.

1 point

True

False

Clear selection

4 points

potassium

Sodium

Helium

magnesium

Clear selection

Work is a scalar quantity

1 point

True

False

Clear selection

The displacement that occurs in unit time is called ............... .

1 point

direction

velocity

speed

acceleration

Clear selection

When the angle between force and displacement as 0° work done is - ...............

1 point

minimum

maximum

negative

All of the above

Clear selection

The composition of substance changes during ............... change.

1 point

Physical

Chemical

Biochemical

None of the above

Clear selection

The size of atom is determined by its ...............

1 point

radius

nucleus

proton

atomic mass

Clear selection

The proportion by weight of hydrogen and oxygen in water molecule is ...............

1 point

1 : 5

2 : 5

1:8

6 : 2

Clear selection

4 points

NH4+

Cl-

Na+

Cu+

Basic radical

acidic radical

Composite Radical

Mono atomic radical

Clear selection

As energy of the body increases, its power decreases.

1 point

True

False

Clear selection

The ............... atom being the lightest was initially chosen as the reference atom.

1 point

Helium

Lithium

Hydrogen

Boron

Clear selection

If a charge of 30 C passes through the cross section of a wire in one minute, ﬁnd the current through the wire.

2 points

0.5 A

5 A

5.5 A

0.05 A

Clear selection

The size of an atom is determined by its radius.

1 point

True

False

Clear selection

The velocity of a body changes when ............... .

1 point

Speed changes but direction is constant

direction changes but speed is constant

Speed and direction changes

All of the three

Clear selection

Relative mass of Nitrogen atom is ...............

1 point

Clear selection

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