CBSE Questions for Class 8 General Knowledge Basic Science Quiz 5 - MCQExams.com

The instrument used for measuring the velocity of wind is called__________.
  • Anemometer
  • Barometer
  • Chronometer
  • Audiometer
Volume can be defined as the amount of space that a substance or object occupies, or that is enclosed within a container. Which of the following tools would you use to measure volume?
  • Compass
  • Weighing balance
  • Graduated cylinder
  • Ruler
Radioactivity is measured by _____.
  • GM Counter
  • Polarimeter
  • Calorimeter
  • Colorimeter

Two electrons are moving towards each other each with a velocity of $${\text{1}}{{\text{0}}^{{\text{6}}\;}}{\text{m/s}}$$.What will be closest distance of approach between them?
  • $$1.53 \cdot \times {10^{ - 8}}m$$
  • $$2.53 \cdot \times {10^{ - 10}}m$$
  • $$2.53 \cdot \times {10^{ - 6}}m$$
  • Zero
The basic elements of all organic compounds is:
  • Oxygen
  • Hydrogen
  • Nitrogen
  • Carbon
A liquid is following in a horizontal pipe of non-uniform cross section. Which of the following quantities remain change with respect to time ?
  • Kinetic energy per unit volume
  • Pressure energy per unit volume
  • Potential energy per unit volume
  • Speed of flow
What does the chemical symbol Fe stand for?
  • Iron
  • Gold
  • Silver
  • Cheese
Cell membrane is chemically composed of 40-60 % of
  • fats
  • lipids
  • sugar
  • cytosol
Which of the following is not part of ecological modernization theory?
  • environmental protection and economic growth are incompatible aims
  • environmental protection cannot be achieved without high tech solutions
  • an ecological form of economic growth is possible
  • consumer demand and market mechanisms can bring about ecologically benign outcomes
The acceleration -time graph of a particle moving in a straight line is as shown in figure. The velocity of the particle at time t=0 in a m/s. The velocity after 2 seconds will be


1529557_2c9eacbabd1a486f8be3429b7c2c7aac.png
  • $$6 m/s$$
  • $$4 m/s$$
  • $$2 m/s$$
  • $$8 m/s$$
A sphere of mass m is held between two smooth inclined walls. For $$\sin 37^\circ=\frac{3}{5},$$ the normal reaction of the wall (2) is equal to
1527362_8544481dc9e546a0837c1c593cd69cf4.png
  • $$\dfrac{16mg}{25}$$
  • $$\dfrac{25mg}{21}$$
  • $$\dfrac{39mg}{21}$$
  • $$mg$$
Which one of the following pairs is correctly matched?
  • Biosphere — Eduard Suess
  • Ecosystem — A.P. de Candolle
  • Ecology — A.G. Tansley
  • Biodiversity — Reiter
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
Invention means
  • process of utilising knowledge.
  • some unknown facts.
  • a new utilisation of existing knowledge.
  • ways of classifying things.
A body partially floats in wafer when
  • The volume of the displaced liquid is equal to the volume of the body
  • The volume of the displaced liquid is greater than the volume of the body
  • The weight of the displaced water is equal to the weight of the body
  • The weight of the displaced water is greater than the weight of the body
Select the correct alternative about Habermas' reconstruction of Marxism: i. Purposive rational action instead of superstructure ii. Symbolic interaction instead of superstructure iii. Societal modes of self-reflection instead of class consciousness iv. Class competition instead of class conflict Select the correct alternative:
  • i, ii, iii
  • i, ii, iv
  • ii, iii, iv
  • i, ii, iii, iv
The density of sea water is highest as
  • Depth increases and salinity increases
  • Depth decreases and salinity increases
  • Depth increases and salinity decreases
  • Depth decreases and salinity decreases
Which famous scientist unknowingly founded the field of spectroscopy?
  • Issac Newton
  • Galileo
  • Graham Bell
  • None of the above
Pick up the correct food chain.
  • grass chamelion insect bird
  • grass fox rabbit bird
  • phytoplankton zooplankton fish
  • fallen leaves bacteria insect larvae
Scientists prepared the ____ of solution for their next experiment.
  • vial
  • vile
  • viol
  • NA
Walking along a large city park on a hot summer day, you look for a cool resting place and sit down on a large rock under a tree, at the quiet edge of a stream. You have searched for and found an example of a :
  • microclimate
  • biome
  • landscape
  • population
Consider following statement about the estuary
(I) Estuary is a place where the river fresh water meets with ocean water
(II) This area is highly productive
(III) This area is highly unproductive
(IV) All of the above
Which of above the statements is/are true?
  • (I) only
  • (II) only
  • (I) and II)
  • (III)
Competition for light, nutrients and space is most severe between
  • closely related organism growing in different niches
  • closely related organisms growing in the same area/niche
  • distantly related organisms growing in the same habitat
  • distantly related organisms growing in different niches
Match List-I with List-II and select the correct answer from the codes given below:
List-I                        List-II
A. Biodiversity     G. Tansley
B. Wildlife           E.O. Wilson
C. Ecosystem.       E. Haeckel
D. Ecology            4. W.T. Hornaday
  • A2, B4, C3, D1
  • A2, B4, C1, D3
  • A4, B2, C3, D1
  • A4, B2, C1, D3
Which of following statement is true about the Ecotone?
  • It is meeting place of two different ecosystems
  • It is meeting place of two same eco systems
  • Density of species is very low here
  • All of the above
If you take a beaker full of water and add salt to it, the salt dissolves completely and disappears.
Which of these properties of matter is shown by that activity?
  • Particles of matter attract each other.
  • Matter is made up of particles.
  • Particles of matter are continuously moving.
  • Particles of matter have space between them.
Tina pushes a toy car on three different surfaces using the same force and notes the distance travelled on each in 10 s. She understands that the force of friction caused the change in motion of the toy car.What factor varied the force of friction here?
SurfaceDistance (cm)
Wooden$$62$$
Glass$$104$$
Carpeted$$48$$
  • Distance moved by the toy car
  • The type of the surface in which the toy car moved
  • Force applied on the toy car
  • Mass of the toy car
The table lists some characteristics of a part of a cell, X.What can X be identified as?
$$\bullet$$ It is porous in nature.
$$\bullet$$ It separates cell from the surrounding medium
$$\bullet$$ It allows substances to move inward and outward of the cell.
  • Plasma membrane
  • Cytoplasm
  • Nuclear membrane
  • Nucleus
Can someone help me with this question on conversions? A baseball pitcher pitches a ball at $$92$$ miles per hour. Which of the following would give it in feet per second?
  • $$\dfrac{5280\,feet}{1\,mile}$$
  • $$\dfrac{3\,feet}{1\,yard}$$
  • $$\dfrac{60\,minutes}{1\,hour}$$
  • $$\dfrac{60\,seconds}{1\,hour}$$
The freezing point on a thermometer is market as $$-20^{\circ} $$ and the boiling point as $$130^{\circ} $$. A temperature of human body $$ (34^{\circ}C $$ on this therometerwill be read as
  • $$ 31^{\circ} $$
  • $$ 51^{\circ} $$
  • $$ 20^{\circ} $$
  • None of these
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