Science-Tech

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The metal used for making aircrafts and rockets is.....
Lead
no
Aluminium
yes
Nickel
no
Copper
no
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Radar is used to.....
Locate submerged submarines
no
Receive signal from radio receivers
no
Detect and locate distant objects
yes
Locate geostationary satellites
no
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Which vein brings clean blood from the lungs into the heart?
Renal Vein
no
Pulmonary Vein
yes
Vena Cava
no
Hepatic Vein
no
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Myrmecology is study of....
Insects
no
Ants
yes
Crustaceans
no
Arthropods
no
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In galvanization, iron is coated with...
Copper
no
Zinc
yes
Tin
no
Nickel
no
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A hollow sphere of radius R, a hollow cube of side R and a thin circular plate of radius R, made up of the same material, are all heated to 20° C above room temperature. When left to cool in the room, which of them will reach the room temperature first?
Circular plate
no
Cube
no
Sphere
yes
All of them will reach the room temperature at the same time
no
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Consider the following factors 
1. Rotation of the Earth 
2. Air pressure and wind 
3. Density of ocean water 
4. Revolution of the Earth 

Which of the above factors influence the ocean currents?
1 & 2 Only
no
1, 2, 3
yes
1 & 4
no
2, 3 & 4
no
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Consider the following kinds of organisms: 
1. Bat
2. Bee
3. Bird

Which of the above is/ an pollinating agent/agents?
1 & 2 only
no
2 Only
no
1 and 3 only
no
1, 2 & 3
yes
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What is the role of ultraviolet (UV) radiation in the water purification systems? 
1. It inactivates/kills the harmful micro-organisms in water. 
2. It removes all the undesirable odours from the water. 
3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water. 

Which of the statements given above is/are correct?
1 Only
yes
2 & 3 Only
no
1 & 3 Only
no
1, 2 & 3
no
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The brightest planet is..........

Venus
yes
Mercury
no
Jupiter
no
Mars
no
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