62- Sugar syrup is used for the preservation of fruits because it:
A. Kills the micro-organisms present in them
B. Mixes well with the fruits
C. Drains moisture to inhibit growth of micro-organisms
D. Helps to improve their taste and flavor
View Answer
Answer : C. Drains moisture to inhibit growth of micro-organisms
Description
63- The hardest part of the human body is:
A. Rib
B. Skull
C. Femur
D. Tooth enamel
View Answer
Answer : D. Tooth enamel
Description
64- Without burning paper, water can be boiled in a paper cup because:
A. Ignition temperature of paper is more than boiling point of water
B. Paper is a bad conductor of heat
C. Heat capacity of paper is less than that of water
D. Water is a good conductor of heat with high specific heat
View Answer
Answer : A. Ignition temperature of paper is more than boiling point of water
Description
65- The densest planet in our solar system is:
A. Mars
B. Earth
C. Venus
D. Mercury
View Answer
Answer : B. Earth
Description
66- The largest organ of the human digestive system is:
A. Liver
B. Stomach
C. Small intestine
D. Large intestine
View Answer
Answer : C. Small intestine
Description
67- Which gas makes up approximately 78% of the Earth's atmosphere?
A. Argon
B. Oxygen
C. Nitrogen
D. Carbon Dioxide
View Answer
Answer : C. Nitrogen
Description
68- Sun is a:
A. Star
B. Planet
C. Comet
D. Satellite
View Answer
Answer : A. Star
Description
69- The age of the solar system is:
A. 4.5 Billion years
B. 5.5 Billion years
C. 6.5 Billion years
D. 7.5 Billion years
View Answer
Answer : A. 4.5 Billion years
Description
70- A unit of length equal to the average distance between the Earth and Sun is called:
A. Parsec
B. Astronomical Unit
C. Parallax
D. Light year
View Answer
Answer : B. Astronomical Unit
Description
71- An eclipse of the Sun occurs when:
A. The Moon is between the Sun and the Earth
B. The Sun is between the Earth and the Moon
C. The Earth is between the Sun and the Moon
D. The Earth casts its shadow on the Moon
View Answer
Answer : A. The Moon is between the Sun and the Earth
Description
72- The Ozone layer is present about 30 miles (50 km) in atmosphere above the Earth. The stratum (layer) of atmosphere in which ozone layer lies is called as:
A. Troposphere
B. Exosphere
C. Mesosphere
D. Stratosphere
View Answer
Answer : D. Stratosphere
Description
73- Which rocks are formed by the alteration of pre-existing rocks by great heat or pressure?
A. Acid rocks
B. Metamorphic
C. Igneous rocks
D. Sedimentary rocks
View Answer
Answer : B. Metamorphic
Description
74- The most abundant natural Iron Oxides are:
A. Magnetite and Bauxite
B. Magnetite and Pyrite
C. Hematite and Pyrite
D. Hematite and Magnetite
View Answer
Answer : D. Hematite and Magnetite
Description
75- The two most abundant elements in sea water are:
A. Chlorine and Iodine
B. Sodium and Chlorine
C. Sodium and Calcium
D. Sodium and Potassium
View Answer
Answer : B. Sodium and Chlorine
Description
76- An electric current can produce:
A. Chemical effect
B. Magnetic effect
C. Heating effect
D. All of three
View Answer
Answer : D. All of three
Description
77- The unit of home electricity energy consumption is:
A. Watt hour
B. Kilowatt hour
C. Joule hour
D. None of these
View Answer
Answer : B. Kilowatt hour
Description
78- The magnet always points in the same direction, if allowed to move freely i.e towards North and South poles because of:
A. Gravitational field
B. A lot of metal deposits on North and South Poles
C. Due to attraction of North Pole and repulsion of Western Pole
D. Earth is a huge magnet
View Answer
Answer : D. Earth is a huge magnet
Description
79- When sound is reflected from floor, ceiling or a wall, it mixes with the original sound and changes its complexion, it is called as:
A. Echo
B. Reverberation
C. Noise
D. Sound
View Answer
Answer : B. Reverberation
Description
80- The speed of sound in dry air at 20°C is about:
