Match column I with column II and select the correct option from the given codes. Column I(Units) Column II(Quantities) (i) Ampere p. Temperature (ii) Nautical mile q. Electric current (iii) Kelvin r. Distance at sea (iv) Ohm s. Energy (v) Joule t. Resistance

(i)-q, (ii)-r, (iii)-p, (iv)-t, (v)-s

(i)-p, (ii)-q, (iii)-r, (iv)-s, (v)-t

(i)-t, (ii)-s, (iii)-r, (iv)-q, (v)-p

(i)-q, (ii)-p, (iii)-s, (iv)-r, (v)-t

MCQ Questions for Class 8 General Knowledge Basic Science Quiz 1

$a$ . To draw water from a well we have to ________ at rope.

$b$ . A charged body _______ an uncharged body towards it.

$c$ . To move a loaded trolley we have to _______ it.

$d$ . The north pole of a magnet _______ the north pole of another magnet
.

0%
Attracts, Push, Repels, Pull
0%
Pull, Attracts, Repels, Push,
0%
Pull, Attracts, Push, Repels
0%
Pull, Push, Repels, Attracts

When a bicycle is in motion by pedalling, the force of friction exerted by the ground on the two wheels is such that it acts ___________________.

0%
In the backward direction on the front wheel and in the forward direction on the rear wheel
0%
In the forward direction on the front wheel and in the backward direction on the rear wheel
0%
In the backward direction on both front and the rear wheels
0%
In the forward direction on both front and the rear wheels

The mass of a body on earth is

$100kg$ (acceleration due to gravity

$g=10m/{s}^{2}$ ). If acceleration due to gravity on the moon is

$\cfrac{g}{6}$ , then the mass of the body on the moon is _______________.

0%
$\cfrac{100}{6}kg$
0%
$60kg$
0%
$100kg$
0%
$600kg$

For a missile launched with a velocity less than the Earth's escape velocity, the total energy is ___________.

0%
positive
0%
negative
0%
zero
0%
either positive or negative

To avoid slipping while on ice, one should take smaller steps because of the _____________.

0%
friction of ice is large
0%
larger normal reaction
0%
friction of ice is small
0%
smaller normal reaction

Match the following lists

List I	List II
(A) Formation of day and night	(1) Geostationary satellite
(B) Short range warning about environment	(2) Polar satellite
(C) Longer term forcasting about environment	(3) Rotation of earth around the sun
(D) Formation of tide in ocean	(4) Gravitational attraction between moon and ocean water

0%
A-1; B-2; C-3; D-4
0%
A-3; B-1; C-2; D-4
0%
A-4; B-3; C-2; D-1
0%
A-3; B-4; C-2; D-1

How many cubic centimetres

$(cm^3)$ are in a cubic metre

$(m^3)$ ?

0%
$10^3$
0%
$10^6$
0%
$10^9$
0%
$10^{12}$

Explanation

Cubic meter is a metric volume unit and defined as the volume of a cube with sides are 1 meter in length.

Cubic centimeter is a metric volume unit and defined as the volume of a cube with sides are 1 centimeter in length.

1 cubic meter equals to one million cubic centimeters

i.e.

$1m^3$ =

$10^6cm^3$

For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is

0%
$1/ \sqrt{2}$
0%
$1/2$
0%
$\sqrt {2}$
0%
$2$

Explanation

We know that,

Potential energy,

$U=-\dfrac{G{{M}_{e}}m}{{{R}_{e}}}$

Where,

${{M}_{e}}=$ Mass of the earth

$m=$ Mass of satellite

${{R}_{e}}=$ Radius of the earth

$G=$ Gravitational constant

Now,

$|U|=\dfrac{G{{M}_{e}}m}{{{R}_{e}}}$

Now, kinetic energy

$K=\dfrac{1}{2}\dfrac{G{{M}_{e}}m}{{{R}_{e}}}$

Now,

$\dfrac{K}{|U|}=\dfrac{1}{2}\dfrac{G{{M}_{e}}m}{{{R}_{e}}}\times \dfrac{{{R}_{e}}}{G{{M}_{e}}m}$

$\dfrac{K}{|U|}=\dfrac{1}{2}$

Hence, $\dfrac{1}{2}$

Which one of the following properties changes with valency?

0%
Atomic weight
0%
Equivalent weight
0%
Molecular weight
0%
Density

An atom of carbon has 6 protons. Its mass number isHow many neutrons are present in an atom of carbon ?

0%
12
0%
6
0%
10
0%
14

Consider the following statements
1) the positive charge is essentially immovable because it contains practically all the mass of the atom.
2) Atom is the smallest indivisible particles of an element which takes part in a chemical reaction
Which of the above is / are correct ?

0%
Only 1
0%
Only 2
0%
1 and 2
0%
None of these

Consider the following statements
1) Clusters of atoms that act as an ion are called polyatomic ions.
2) In ionic compounds , the charge on each ion is used to determined the chemical formula of the compound.
Which of the statement(s) given above is / are correct ?

0%
Only 1
0%
Only 2
0%
1 and 2
0%
None of these

The most of the mass of the atom can be found in_______.

0%
electrons
0%
charges
0%
nucleus
0%
electron colud

The properties of substance

$X, Y$ and

$Z$ are given as:

$X :$ Gas, transparent, colourless

$Y :$ Solid, translucent, insulator

$Z :$ Liquid, opaque, edible

$X, Y$ and

$Z$ are respectively

0%
Water vapour, petrol and mercury
0%
Fog, frosted glass and muddy wawter
0%
Oxygen, butter paper and milk
0%
Chlorine, glass jar and water

Explanation

$X :$ Oxygen gas is colourless and transparent.

$Y :$ Butter paper is solid, translucent and an insulator.

$Z :$ Milk is an edible and opaque liquid.

Brass gets discoloured in air due to constant exposure in presence of _________________.

0%
Aluminium .phosphide
0%
Hydrogen suiphide
0%
Hydrogenated wafers
0%
Aluminium sulphide

Consider the following statements
1) The neutron was discovered in 1932 by bombarding beryllium with

$\alpha$ -rays.
2) The electron and proton have equal but opposite electron charges.
3) The neutron is not charged.
Which of the statements given above are correct ?

0%
1 and 2
0%
2 and 3
0%
1 and 3
0%
1 , 2 and 3

Which one of the following is also called stranger gas __________.

0%
Argon
0%
Neon
0%
Xenon
0%
Nitrous oxide

Which of the following statements is correct ?

0%
Rutherford's alpha- particle scattering experiment led to the discovery of electron.
0%
JJ Thomson suggested that the nucleus of atom contains protons .
0%
The atomic number of an element is the same as the number of protons in the nucleus of its atom.
0%
The mass number of an atom is equal to the number of electrons in its shells.

Human wants are ___________.

0%
One thousand
0%
Few
0%
FewInnumerable
0%
Countable

Which among the following is an insect?

The symbol of SI unit of inductance is

$H$ . It stands for ____.

0%
Holm
0%
Halogen
0%
Henry
0%
Hertz

Which of these animals can live both on land and in water?

Match column I with column II and select the correct option from the given codes.

Column I(Units)	Column II(Quantities)
(i) Ampere	p. Temperature
(ii) Nautical mile	q. Electric current
(iii) Kelvin	r. Distance at sea
(iv) Ohm	s. Energy
(v) Joule	t. Resistance

0%
(i)-q, (ii)-r, (iii)-p, (iv)-t, (v)-s
0%
(i)-p, (ii)-q, (iii)-r, (iv)-s, (v)-t
0%
(i)-t, (ii)-s, (iii)-r, (iv)-q, (v)-p
0%
(i)-q, (ii)-p, (iii)-s, (iv)-r, (v)-t

Read the following statements carefully and select the option which correctly identifies the true (T) and false (F) statements.
(i) Synthetic fibres are the fibres that are made from chemicals.
(ii) Cashmere wool is obtained from cashmere rabbit.
(iii) Anthrax is an occupational disease caused by a bacteria Bacillus anthracis.

0%
T F T
0%
F F T
0%
T T F
0%
F T T

Kunal has classified a few processes as shown in the given table:

S. No.	Processes	Type of change
I.	Sublimation of naphthalene balls	Chemical
II.	Heating of sodium with chlorine gas	Physical
III.	Mixing sodium hydroxide with copper sulphate solution	Chemical
IV.	Expansion of bimetallic strip	Chemical
V.	Extraction of a metal by electrolysis	Physical

The processes which are classified incorrectly are

0%
II, IV and V only
0%
III and V only
0%
I, II, IV and V only
0%
All of these

Explanation

I. Sublimation of naphthalene balls is a physical change as solid naphthalene changes into its gaseous form.
II. When sodium is heated with chlorine, a new substance, sodium chloride is formed.

$\underset {Sodium}{Na_{(s)}} + \underset {Chlorine}{\dfrac {1}{2}Cl_{2(g)}}\rightarrow \underset {Sodium\ chloride}{NaCl_{(s)}}$
Thus, it is a chemical change.
III. When sodium hydroxide is mixed with copper sulphate, copper hydroxide and sodium sulphate are formed.

$\underset {Sodium\ hydroxide}{NaOH} + \underset {Copper\ sulphate}{CuSO_{4}}\rightarrow \underset {Copper\ hydroxide}{Cu(OH)_{2}} + \underset {Sodium\ sulphate}{Na_{2}SO_{4}}$ .
This is a chemical change as new substances are formed.
IV. Expansion of bimetallic strip is a physical change.
V. Extraction of a metal by electrolysis is a chemical change.

Who has become the first Indian to be honoured with the Linnean Medal in Botany?

0%
Sharachandra Lele
0%
Kamalijit Bawa
0%
R Siddappa Setty
0%
P S Mathur

The angle of conduct does not depend upon

0%
temperature
0%
soluble impurity
0%
cohesive force
0%
the inclination of surface in contact

A cell will plasmolysis , if it is placed in _____________.

0%
Hypertonic solution
0%
Hypotnic solution
0%
Isotonic solution
0%
Concentration of water molecules does not matter

Photosynthesis is an important mode of autotrophic nutrition. The event which does not occur in photosynthesis is ___________________.

0%
Conversion of light energy to chemical energy
0%
Reduction of carbon dioxide to carbohydrate
0%
Oxidation of carbon to carbondioxide
0%
Absorption of light energy by chlorophyll

Double fertilization is a unique feature of ____________.

0%
Bryophytes
0%
Angiosperm
0%
Algae
0%
Gymnosperm

CBSE Questions for Class 8 General Knowledge Basic Science Quiz 1 - MCQExams.com

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Practice Class 8 General Knowledge Quiz Questions and Answers

CBSE Questions for Class 8 General Knowledge Basic Science Quiz 1 - MCQExams.com

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Practice Class 8 General Knowledge Quiz Questions and Answers

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