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Science Test - 14
Read Instructions for the test.
Negative marks are -0.33 per wrong answer
Right answer is 1 mark
No time limit but finish in 30 mins
Solution can be found at below chapters:
Test series is based on following chapters.
Science Chapter 25: Methods of Separation
Science Chapter 26: Surface Tension
Science Chapter 27: Star
Q1: When water is removed along with lighter component it is called
Q2: Separate components of different sizes by filter is called
Q3: Bubbles are spherical due to phenomenon called
Q4: Phenomenon of surface tension explains
Water doesn’t spread on some surfaces but forms droplets.
Oil and water don’t mix;
water wets us but not ducks.
Q5:Properties of Surface Tension
Surface tension decreases with temperature.
Surface tension increases with temperature.
Surface tension doesnt change with temperature.
Q6: What is true regarding glass
Glass is an extremely viscous liquid;
The windowpanes of old buildings are thicker at the bottom as glass flows down due to gravity.
Q7: Order of strength of friction forces is
Q8: Which is true ?
Use of ball bearings in hubs and axels of ceiling fans and bikes to reduce contact surface between two solid parts.
Thin cushion of air is maintained between solids in relative motion for same purpose.
Q9:There is no atmosphere on moon as
low escape velocity of gas molecules
Q10: Satellites are launched preferably from equator and eastwards as
it aids the speed due to lower acceleration due to gravity ‘g’
the weather is calmer there
equator is higher in altitude
Q11: Speed of rotation of satellites is
dependent on its mass.
dependent on its size.
Q12:Which is true ?
centrifugal force is more at equator than poles.
Gravity is higher at poles than equator.
both A and B
Q13:we never see the other side of the moon as
time taken by moons rotation and revolution is same
moon doesnt rotate
other side reflects all light incident on it
Q14:Which is the Earth's twin
Q15: Largest asteroid is
Q16:Greenhouse effect is seen when the _____ radiation of the earth is absorbed by the greenhouse gases causing heating of the atmosphere.
Q17: Depletion of ozone layer above Antarctica is seen and is called ozone hole. This is due to
polar stratospheric clouds
both A and C
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