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Science Test - 11
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 19: Light, shadows and reflection
Science Chapter 20: Magnetism
Science Chapter 21: Electricity and Circuits
Q1:Image of convex lens can be
real or virtual
inverted or erect and same size,
larger or smaller
all the above
Q2: Image of concave lens can be
virtual
erect
diminished
all
Q3: Convex lens is used in
microscope
refracting telescopes
reflecting telescopes
all
Q4: Which is true ?
Convex lens are converging
concave lenses are diverging
Power of convexlens is positive and concave lens is negative.
all
Q5:Refraction of light causes
pencil appears to bend in water
coin in water appears raised.
The object inside water appears enlarged.
all
Q6: Which is not caused by refraction
Twinkling of stars
advanced sunrise or delayed sunset
apparent flattening of sun at sunrise and sunset into oval shape
moon appears larger in horizon than in sky
Q7: Which is true ?
Dawn and twilight are also due to refraction
they are maximum at the poles and decrease towards the equator.
none
both
Q8: when a ray of light traveling from denser to rarer medium is incident at an angle more than the critical angle, it is reflected inside and no refraction takes place. This is
total internal reflection
refraction
critical angle reflection
scattering
Q9: total internal reflection is seen in
mirage
optical fibers
diamond cutting
all
Q10:Light travels fastest in
solids
gases
liquids
vacuum
Q11: Which is true
Scattering of light causes blue sky phenomenon and reddening of sun at sunrise and sunset
Blue wavelength is easily scattered by dust particles, hence sky appears blue.
However at a great height effect of scattering are negligible so sky appears dark.
all
Q12:Alert lights are Red as
red is scattered easily
lower wavelength
both A and B
it has higher wavelength
Q13: At sunrise or sunset , the sun appears red as
it has low wavelength
it is scattered easily
internal reflection
it has higher wavelength
Q14:in cinemas the images are flashed at a rate faster than 16 per second because of
persistance of vision
refraction
diffusion
dispersion
Q15: Which is true regarding retinal cells in birds
Day birds have more cones shaped cells than rod cells
night birds have more rod shaped cells than cone shaped cells
both
none
Q16: Conductors – Allow electricity to pass through them due to
high heat capacity
tensile strength
high ductility
free electrons present on their surface
Q17: Heating effect of electric current is seen in
geyser
heater
iron
all the above
Q18:Magnetic effect of current was seen in
electromagnets
electric bells
both
none
Q19: Chromium coating is used on utensils as
it doesnt rust or stratch
it is good conductor of heat
both
none
Q20:Chips bags are flushed with ____ to prevent oxidation.
oxygen
potassium
argon
nitrogen
Q21:Bifocals are needed by a person suffering from
Household devices are connected in parallel.
AC current can be transmitted farther than DC without much loss of electrical energy.
both
none
Q22: Fuel cells use
reaction of oxygen and hydrogen, porous carbon electrodes and aqueous solution of NaOH.
Platinum or palladium electrodes are used as catalysts.
both
none
Q23: Which is true
Electromagnetic force can be attractive or repulsive
gravitational force is always attractive.
both
none
Q24: Which is in the order of strengths
EM>Gravity>Nuclear
Nuclear>Gravity>EM
Nuclear>EM>Gravity
Gravity>EM>Nuclear
Q25: Which is true ?
Magnetic field produced by a current in a conductor decreases as the distance from it increases.
Gravitational force doesn’t need an intervening medium
both
none
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