QUIZ ON SCIENCE- TECHNOLOGY
Q.1 - For Safety, the fuse wire used in the mains for household supply of electricity must be made of metal having
A. Low Melting Point
B. High Resistance
C. High Melting Point
D. Low Specific Heat
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Correct Answer: A
Q.2 - Sodium metal is kept under
A. Petrol
B. Alcohol
C. Water
D. Kerosene
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Correct Answer: D
Q.3 - The element common to all acid is
A. Hydrogen
B. Carbon
C. Sulphur
D. Oxygen
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Correct Answer: A
Q.4 - Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
A. X-rays
B. Ultraviolet Light
C. Visible Light
D. Radio waves
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Correct Answer: C
Q.5 - On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
A. mercury is a metal
B. density of mercury is greater than that of water
C. Cohesion of mercury is greater than its adhesion with glass
D. Cohesion of water is greater than its adhesion with glass
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Correct Answer: C
Q.6 - Ecology deals with
A. Birds
B. Cell formation
C. Relation between organisms and their environment
D. Tissues
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Correct Answer: C
Q.7 - Friction can be reduced by changing from
A. sliding to rolling
B. rolling to sliding
C. potential energy to kinetic energy
D. dynamic to static
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Correct Answer: A
Q.8 - For Seeing Objects at the Surface of water from a submarine under water, the instrument used is
A. Kaleidoscope
B. Periscope
C. spectroscope
D. telescope
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Correct Answer: B
Q.9 - Entomology is the science that studies
A. Behaviour of Human Beings
B. Insects
C. The Origin and History of technical and scientific terms
D. The formation of rocks
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Correct Answer: B
Q.10 - The Ozone Layer restricts
A. Visible Light
B. Infrared radiation
C. X-rays and Gamma rays
D. Ultraviolet radiation
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Correct Answer: D
Q.11 - A pond of clear water appears less deep than it really is. This is due to
A. Refraction
B. Reflection
C. The transparency of water
D. Dispersion
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Correct Answer: A
Q.12 - Stars appears to move from east to west because
A. All stars move from east to west
B. The earth rotates from west to east
C. The earth rotates from east to west
D. The background of the stars moves from west to east
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Correct Answer: B
Q.13 - Convex lenses are used for the correction of
A. Long-Sightedness
B. Short- Sightedness
C. Cataract
D. None of these
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Correct Answer: A
Q.14 - Red light is used in traffic signals because
A. It has the longest wavelength
B. It is beautiful
C. It is visible to people even with bad eyesight
D. None of these
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Correct Answer: A
Q.15 - Pencil “lead†is made up of
A. Charcoal
B. Lead oxide
C. Graphite
D. Lampblack
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Correct Answer: C
Q.16 - Solar Cell converts
A. Light energy into heat energy
B. Solar energy into electrical energy
C. Solar energy into sound energy
D. Solar energy into heat energy
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Correct Answer: B
Q.17 - The image formed on the retina of the eye is
A. Real and Inverted
B. Upright and Real
C. Virtual and Upright
D. Enlarged and Real
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Correct Answer: A
Q.18 - The blue colour of the water in the sea is due to
A. Refraction of the blue light by the impurities in sea water
B. Reflection of blue sky by the sea water
C. Absorption of other colours except the blue colour by water molecules
D. Scattering of blue light by water molecules
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Correct Answer: B
Q.19 - Rainbow is due to
A. Absorption of sunlight in minute water droplets
B. Diffusion of sunlight through water droplets
C. Ionization of water deposits
D. Refraction and reflection of sunlight by water droplets
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Correct Answer: D
Q.20 - The oil in the wick of a lamp rises up due to
A. Pressure difference
B. Low viscosity of oil
C. Capillary action
D. Gravitational force
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Correct Answer: C
Q.21 - Food is cooked in a pressure cooker quickly because
A. Boiling point of water decreases
B. Boiling point of water increases
C. It absorbs heat quickly
D. It retains heat for a longer duration
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Correct Answer: B
Q.22 - The sky appears blue because
A. It is actually blue
B. The atmosphere scatters blue light more than the others
C. All colours interface to produce blue
D. In white light, blue colour dominates
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Correct Answer: B
Q.23 - A glass tumbler containing ice shows droplets of water on the outer surface because
A. The outer surface of the tumbler shows hygroscopic effect
B. The moisture in the air on coming in contact with the cold surface of the tumbler condenses in the form of droplets of water
C. Water from inside oozes out through minute porous wall of the tumbler
D. Both (A) and (C)
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Correct Answer: B
Q.24 - Magnetism at the center of a bar magnet is
A. Minimum
B. Maximum
C. Zero
D. Minimum or maximum
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Correct Answer: C
Q.25 - Isotopes of an element contain
A. The same number of protons but different number of neutrons
B. The same number of neutrons but different number of protons
C. Equal number of protons and electrons
D. Equal number of nucleons
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Correct Answer: A
Q.26 - Identify the vector quantity from the following
A. Heat
B. Angular momentum
C. Time
D. Work
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Correct Answer: B
Q.27 - An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When itIs vertically at a point ‘A’ on the ground a bomb is released from it. The bomb strikes the ground at point ‘B’. The distance ‘AB’ is...
A. 1200 m
B. 0.33 km
C. 3.33 km
D. 33 km
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Correct Answer: C
Q.28 - Photosynthesis takes place faster in
A. Yellow light
B. White light
C. Red light
D. Darkness
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Correct Answer: B
Q.29 - It is more difficult to walk on a sandy road than on a concrete road because
A. Sand is soft and concreter is hard
B. The friction between sand and feet is less than that between concrete and feet
C. The friction between sand and feet is more than that between concrete and feet
D. The sand is grainy but concrete is smooth
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Correct Answer: B
Q.30 - Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to...
A. The heating effect of current alone
B. Hysteresis loss alone
C. Both the heating effect of current and hysteresis loss
D. Intense sunlight at noon
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Correct Answer: C