Q. The repeated reflection that results in persistence of sound is called :
1) echo
2) rarefaction
3) reflection
4) reverberation
Q. The hardest natural substance is :
1) Iron
2) Diamond
3) Copper
4) Graphite
Q. What is the amount of work done when a body moves under a force of 1N at a distance of 1 metre in the direction of the force?
1) 100 Joules
2) 1 Joule
3) 0.01 Joules
4) 10 Joules
Q. In the Modern Periodic Table, a zig-zag line separates :
1) metals from metalloids
2) metals from non-metals
3) metals from halogens
4) non-metals from metalloids
Q. One horse power is :
1) 786 watts
2) 746 watts
3) 764 watts
4) 768 watts
Q. Elements A, B and C occur as Dobereiner\''s triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?
1) 12
2) 20
3) 23
4) 40
Q. If you look into a mirror and find that the image (your reflexion) is smaller than you, then the type of the mirror is :
1) plane mirror
2) plano-concave mirror
3) condvex mirror
4) concave mirror
Q. A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. the work done by the force will be .........
1) 20 J
2) 30 J
3) 50 J
4) 40 J
Q. The resistance of a conductor is inversely pro-portional to its :
1) resistivity
2) area of cross section
3) temperature
4) length
Q. Earliest thermometer was developed by:
1) Celsius
2) Fahrenheit
3) Kelvin
4) Galileo
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