CBSE Questions for Class 8 General Knowledge Basic Science Quiz 4 - MCQExams.com

A brass ball is tied to a thin wire and swung so as to move uniformly in a horizontal circle. Which of the following statements in this regard is/are true?
(1) The ball moves with constant velocity.
(2) The ball moves with constant speed.
(3) The ball moves with constant acceleration.
(4) The magnitude of the acceleration of the ball is constant.
Select the correct answer using the code given below:
  • Only 1
  • 1 and 3
  • 1, 2 and 4
  • 2 and 4
For a body moving with constant speed in a horizontal circle, which of the following remains constant?
  • Velocity
  • Acceleration
  • Centripetal force
  • KE
If $$d$$ denotes the distance covered by a car in time $$t$$ and $$S$$ denotes the displacement by the car during the same time, then ________.
  • $$d\le \left| S \right| $$
  • $$d=\left| S \right| $$
  • $$d\ge \left| S \right| $$
  • $$d<\left| S \right| $$
Which one of the following graphs represents uniform motion?
An object with a constant speed ________.
  • is always accelerated
  • is not accelerated
  • might be accelerated
  • also has a constant velocity
Which of the following is/are the example/examples of chemical change?
Crystallisation of sodium chloride
Melting of ice 
Souring of milk 
Select the correct answer using the codes given below.
  • 1 and 2
  • Only 3
  • 1, 2 and 3
  • None of these
Which one of the following is an example of chemical change?
  • Burning of paper
  • Magnetisation of soft iron
  • Dissolution of cane sugar in water
  • Preparation of ice cubes from water
Consider the following statements
(1) When a satellite is orbiting in its orbit, no energy is required to keep it in its orbit.
(2) When the total energy of a satellite is negative, it will be moving in either a circular or an elliptical orbit.
(3) When the total energy of a satellite is zero, it will escape away from its orbit and its path becomes parabolic.
(4) When the total energy of a satellite is positive, it will escape away from the orbit following a hyperbolic path.
Which of the statement(s) given above are correct?
  • 1, 2 and 3
  • 1, 3 and 4
  • 2, 3 and 4
  • 1, 2, 3 and 4
If the radius of the earth's orbit becomes one-fourth of the present value, the deviation of one year will become ________________.
  • $$8$$ times
  • $$\dfrac{1}{8}$$ times
  • $$4$$ times
  • $$\cfrac{1}{4}$$ times
Which of the following represent a chemical change?
Magnetisation of iron.
Condensation of liquid.
Burning of fuel. 
Rusting of iron.
Select the correct answer using the codes given below.
  • 1 and 2
  • 2 and 3
  • 3 and 4
  • 1 and 4
Which one of the following contains powerful oxidative enzyme and helps in removing toxic substances from cells?
  • Plastids
  • Lysosomes
  • Dictyosomes
  • Peroxisomes
Which one of the following is not a chemical change ?
  • Ripening of fruits
  • Curdling of milk
  • Freezing of water
  • Digestion of food
Match the following lists
List IList II
(A) Every planet revolves around the sun
in elliptical orbit and the sun is situated at one 
foci of ellipse		(1) Copemicus
(B) The position vector of the particle with respect to
the centre of force has a constant areal velocity		(2) Ptolemy
(C) Geocentric theory of planetary motion(3) Inverse square law
(D) Heliocentric theory of planetary motion(4) Law of conservation of angular momentum
  • A-3; B-4; C-2; D-1
  • A-1; B-2; C-3; D-4
  • A-4; B-3; C-2; D-1
  • A-2; B- 1; C-3; D-4
Which one among the following is an example of chemical change?
  • The melting of an ice cube
  • The boiling of gasoline
  • The frying of an egg
  • Attraction of an iron nail to a magnet
Which of the following in correct, when a person walks on a rough surface?
  • The frictional force exerted by the surface keeps him moving
  • The force which the man exerts on the floor keeps him moving
  • The reaction of the force which the man exerts on floor keeps him moving
  • None of the above
Consider the following statements:
$$1$$. Centriole take part in spindle formation.
$$2$$. Centriole are found in animals.
Which of the statement(s) given is/are true about centriole?
  • Only $$1$$
  • Only $$2$$
  • $$1$$ and $$2$$
  • None of these
Bali Road map adopted in December 2007 does not provide for ____________________.
  • fixation of greenhouse gas emission limits
  • launching of an adaptation fund
  • amendment to TJN Framework Convention on Climate Change
  • special and differential treatment for developing countries
Conservation of energy implies that
  • energy can be created not destroyed
  • energy can be destroyed but not created
  • energy can be created as well as destroyed
  • energy can be neither created nor destroyed
The science of producing and using plants for food, fuel, feed, fibre and fertilizer is referred to be as ________.
  • agronomy
  • horticulture
  • pisciculture
  • apiculture
Consider the following statements:
$$1$$. Exempt waste contains radioactive waste at a level which is not considered harmful to people.
$$2$$. Very low level waste consists of demolished material such as concrete, plaster, bricks, metal etc.
$$3$$. High level waste consists of fission products like uranium fuel.
Select the correct answer from the given codes.
  • $$1, 2$$ and $$3$$
  • Only $$2$$
  • Only $$3$$
  • $$1$$ and $$3$$
Study the following statements.
$$1$$. Nucleolus takes part in synthesis of ribosomal RNA.
$$2$$. Leucoplast represent colourless plastids.
$$3$$. Mitochondria is absent in bacteria.
Which of the statements given are true?
  • $$1$$ and $$2$$
  • $$2$$ and $$3$$
  • $$1, 2$$ and $$3$$
  • None of the above
Choose the correct answer from the alternatives given.
Which of the following physical quantities will change, if an iron ball is taken to the moon from the earth?
  • Mass
  • Weight
  • Density
  • Volume
Study the following statements: 
Glycolysis takes place in the cytoplasm.
Kreb's cycle takes place in mitochondria.
Electron transport chain takes place in mitochondria.
Which of the statements given above are true?
  • 1 , 2 and 3
  • 1 and 2
  • 2 and 3
  • 1 and 3
In a living cell, what is the site of ribosome formation?
  • Golgi bodies
  • Endoplasmic reticulum
  • Plasma membrane
  • Nucleolus
Lysosomes, which are known as suicidal bags, are produced by which organelle?
  • Mitochondria
  • Golgi body
  • Ribosome
  • Peroxisome
At the time of fire, which of the following things we must not do?
  • Inform fire bridge
  • Evacuate the building as early as possible
  • Use lift
  • Call for help from window and balcony
This branch of science involves the study of bird eggs, nests and breeding, behaviour. Which branch of science is this?
  • Herpetology
  • Oology
  • Ethology
  • Ichthyology
Mycology is the study of _________.
  • Fungi
  • Lichens
  • Ferns
  • Insects
Asterias (Star fish), Echinus (Sea urchin), Antedon (Sea Lily) are all examples of which Phylum?
  • Echinodermata
  • Annelida
  • Platyhelminthes
  • Arthropoda
The term 'ecosystem' represents a group of living organisms, non-living things such as air, water and soil, and their interaction in the habitat in which they live and thrive. Who first coined the term ecosystem?
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