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Science Test - 13
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 22: Acids, Bases and Salts
Science Chapter 23: Heat
Science Chapter 24: Force
Q1: In a nuclear reation what is the purpose of heavy water
speedup the reaction
slow the reaction
slow the neutrons
stop the reactions
Q2: To control the reaction we need
Q3: In pressurized heavy water reactors, what is the moderator
Q4: India has a three stage nuclear program Which is true regarding it
In first stage, the natural uranium is used as fuel, heavy water as moderator [pressurized heavy water reactors] and we get plutonium.
In second stage, plutonium and uranium oxide is used to give uranium -233 in fast breeder reactors where no moderator is needed.
In final stage, thorium and uranium-233 is used to get energy [thorium based reactors].
Q5:Anomalous behavior of water is seen at
Q6: In Anomalous behavior of water its density
Q7: In Anomalous behavior of water its volume
Q8: If water didnt show anomalous behavior then
the ponds would have been frozen killing all fishes
water wouldnt be a universal solvent
Q9:dark clothes are preferred in winter as
Dark clothes or surfaces absorb more heat
dark clothes reflect more heat
dark clothes block heat from escaping
Q10:Woolen clothes are preferred in winter as.
it absorbs heat
it reflects heat
it prevents heat from escaping
Q11: Construction of houses is done using hollow bricks that have air trapped in them as
This prevents heating of houses during summer and keeps flats cool.
During winter the heat from flats doesn’t escape out keeping them warm.
air is a bad conductor of heat
Q12:Which are the applications of pressure
Nail is easily pushed into wood from its pointed end than its head
tools for cutting have a sharp edge
both A and B
Q13:Shoulder bags have broad straps, and porters carrying heavy loads wrap a cloth on their head. This proves
pressure is inverse of area
pressure is directly proportional to area
they are not related
Q14:Suits of astronauts are filed with air to
counter the pressure exerted by body
oxidise the skin
absorb the sweat
prevent escaping of body heat
Q15: At high altitudes we use pressure cookers to cook.
pressure is low so liquids boil at low temperature
pressure is high
nutrient escape out in normal pan
Both B and C
Q16:principle is used in hydraulic lifts and brakes is
liquids are incompressible
pressure is inverse to area
law of conservation of momentum
Q17:Sound waves are ___
Q18: Loudness is measured in
Q19: Speed of sound is highest in
Q20:Speed of sound is related to temperature of medium
Q21:When a sound producing object moves faster than sound, it creates shock waves that have high energy resulting in
Q22: The sensation of sound persists in our brain for
Q23: If the obstacle from which sound is reflected is at distance more than ____ then we hear echo.
Q24: Ultrasonic waves are used in
cleaning of instruments,
detecting cracks in building
echo cardiograph, SONAR
Q25: Doppler Effect is observed when
a moving object causes change in frequency of EM wave
a moving object causes change in pressure
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