1. Pick the odd one out-
(a) Sepals
(b) Stigma
(c) Ovary
(d) Style
ANS: Sepals
2.
The total number of whorls, in a flower, is/are-
(a) one
(b) two
(c) three
(d) four
ANS: four
3. The sea creature that can
produce significant amounts of electricity is the-
ANS: Electrical eel
4.
The _____ attaches a single flower to the inflorescence.
ANS: Pedicel
5. The inside of electric bulb is
filled with an _____ gas like argon or nitrogen.
ANS: inert
A. FILL IN THE BLANKS.
1. The work done depends upon the ____ applied and the _____ produced.
Ans: force, displacement
2. _______ is the capacity to do work.
Ans: Energy
3. _____ energy, stored in a battery, can be used to produce light in a torch.
Ans: chemical
4. ______ is the main source of light energy.
Ans: Sun
5. An electric bell produces sound from ______ energy.
Ans: electrical
B. WRITE TRUE OR FALSE FOR THE FOLLOWING STATEMENTS.
1. Work is done whenever a force is applied on a given object. False
2. A stationery ball does not possess kinetic energy. True
3. A ball raised to a height, is said to possess chemical energy. False
4. The motion, of the blades of a fan, is due to mechanical energy. True
5. Sound is a form of energy. True
C. TICK THE CORRECT OPTION.
1. In which of the following situations, no ‘work’ is being done?
(a) Shifting a box of biscuits from a lower shelf to a higher shelf in the kitchen
(b) Throwing a ball
(c) Pushing a baby stroller on a road
(d) Just holding a book in your hand for two minutes
Ans: just holding a book in your hand
1. The scattering of light by
colloidal solution is called-
(a) Tyndall effect
(b) Raman effect
(c) Colloidal effect
(d) Refraction effect
ANS: Tyndall effect
2. Which phenomenon is responsible
for making the path of light visible?
(a) Tyndall effect
(b) Total internal refraction
effect
(c) Colloidal effect
(d) Refraction effect
ANS: Tyndall effect
3.
Which of the following is not an example of Tyndall effect?
(a) When a fine beam of light
enters a smoke filled dark room through a small hole
(b) Twinkling of stars
(c) When sunlight passes through
a canopy of dense forest in misty conditions.
(d) Shinning a beam of
flashlight into the glass of milk
ANS: Twinkling of stars
4. The colour of the scattered
light depends on ____ of the scattering particles.
(a) colour
(b) speed
(c) size
(d) number
ANS: size
5.
Fine particles mostly scatter ______.
(a) shorter wavelength such as
blue
(b) longer wavelength such as blue
(c) shorter wavelength such as
red
(d) longer wavelength such as
red
ANS: shorter wavelength such as blue
6. Large size particles mostly
scatter-
(a) shorter wavelength such as
blue
(b) longer wavelength such as
blue
(c) shorter wavelength such as
red
(d) longer wavelength such as
red
ANS: longer wavelength such as red
7. The main reason behind the phenomenon
of scattering of light is,
(a) light has large wavelength
value of the order of few metres
(b) light wave can travel
through vacuum
(c) light waves are deflected by
fine particles, molecules present in the air
(d) Sun light is composite light
with blue as its major constituent
ANS: Light waves are deflected by fine
particles, molecules present in the air
8. If size of particles is
comparable to wavelengths of incident light then,
(a) scattering does not take place
(b) all wavelengths will get
scattered equally
(c) scattered light appears violet
(d) internal reflection takes
place
ANS: all wavelengths will get
scattered equally
1. The air layer of atmosphere whose temperature is less then the hot layer behave as optically,
(a) denser medium
(b) rarer medium
(c) inactive medium
(d) either denser or rarer medium
ANS: denser medium
2. Refraction of light by the earth’s atmosphere due to
variation in air density is called
(a)
atmospheric reflection
(b) atmospheric dispersion
(c) atmospheric scattering
(d) atmospheric refraction
ANS: atmospheric refraction
3. The word optical density of
atmosphere refers to-
(a) thickness of atmosphere
(b) brightness of atmosphere
(c) degree to which atmosphere
reduces intensity of light passing through it
(d) degree to which atmosphere
focuses light
ANS: degree to which atmosphere
reduces intensity of light passing through it.
4. Twinkling of stars is due to atmospheric
(a) dispersion of light by water droplets
(b) atmospheric refraction of light by different
layers of varying refractive indices
(c) scattering of light by dust particles
(d) internal reflection of light by clouds.
ANS: atmospheric refraction of light
by different layers of varying refractive indices
5.
As light from a far off star come down towards the earth
(a) it bends away from the
normal
(b) it bends towards the normal
(c) it does not bend at all
(d) it reflects back
ANS: it bends towards the normal
6. The stars appear shifted from
their actual position due to the phenomenon of,
(a) diffraction of light
(b) scattering of light
(c) refraction of light
(d) internal reflection of light
ANS: refraction of light
7. The stars twinkle but the planets do
not twinkle at night because-
(a) the stars are big but the
planets are smaller
(b) the stars are very much
nearer but planets are far off
(c) the stars are far off but
planets are nearer to the earth
(d) planets produce light which
is reflected by stars
ANS: the stars are far off but
planets are nearer to the earth
8.
The planets do not twinkle because-
(a) atmospheric refraction does
not take place
(b) planets are equivalent to a point
source
(c) planets are equivalent to an
extended source
(d) planets do not have
atmosphere
ANS: planets are equivalent to an
extended source
9. Advanced sunrise and delayed sunset
are explained on the basis of
(a) dispersion of light
(b) scattering of light
(c) Tyndall effect
(d) atmospheric refraction
ANS: atmospheric refraction
10. The Sun is visible before the
sunrise and after the sunset because of the phenomenon of ______.
(a) reflection
(b) refraction
(c) dispersion
(d) polarization
ANS: refraction
1. Which
of the following statements is correct regarding the propagation of light of
different colours of white light in air?
(a) Red light moves fastest.
(b) Blue light moves faster than green light.
(c) All the colours of the white light move with the same speed.
(d) Yellow light moves with the mean speed as that of the red and the violet
light
ANS: All the colours of the white
light move with the same speed
2.
The splitting
of light into its component colours is called-
(a) Spectrum
(b) Dispersion
(c) Tyndall effect
(d) Refraction
ANS: Dispersion
3. Dispersion is caused due to
_____ of light.
(a) reflection
(b) refraction
(c) scattering
(d) reflection and refraction
ANS: refraction
4. The dispersive power of
prism depends upon-
(a) The shape of the prism
(b) The material of the prism
(c) The angle of the prism
(d) Height of the prism
ANS: the material of the prism
5.
The dispersive
power will be maximum for-
(a) Flint glass (n=1.65)
(b) Crown glass (n=1.51)
(c) Mixture of glass
(d) None of these
ANS: Flint glass
6. Sumitra was given two glass prisms. One was made of ordinary glass and other one was of flint glass (Given that refractive index of flint glass is more than that of ordinary glass). She traced the path of rays through both and after observing the diagram and concluded that bending of light for given angle of incidence was
(a) more in the prism made of
flint glass
(b) more in the prism made of
ordinary glass
(c) same in both the glass
prisms
(d) independent of the nature of
glass of which the prism was made
ANS: more in the prism made of flint glass
(a) more in the prism made of
flint glass
(b) more in the prism made of
ordinary glass
(c) same in both the glass
prisms
(d) independent of the nature of
glass of which the prism was made
ANS: more in the prism made of flint glass
7. For a light travelling in a
prism choose the correct option. Inside the prism,
(a) all the colours have same
angle of refraction
(b) the colour with more
deviation has lesser refractive index
(c) the colour with lesser
deviation has more speed
(d) all the colours travel with
same speed
ANS: the colour with lesser deviation
has more speed
8.
Which of
the colours of visible light has maximum wavelength?
(a) Yellow
(b) Red
(c) Violet
(d) Green
ANS: Red
1. Lotion is made from Arnica using its-
(a) seeds
(b) leaf
(c) flower
(d) root
ANS: flower
2.
Nodes are present on the _____.
(a) stem
(b) leaf
(c) root
(d) fruit
ANS: stem
3. A ripened ovary forms a-
ANS: Fruit
4.
The dried flower buds of the _____ plant is used as spices.
ANS: Cloves
5. _____ provide support to the
lamina.
ANS: veins
1.
A glass prism has-
(a) 5 rectangular surfaces
(b) 4 rectangular surfaces
(c) 2 triangular bases and 3
rectangular surfaces
(d) 2 rectangular surfaces and 3
triangular bases
ANS: 2 triangular bases and 3
rectangular surfaces
2.
A prism is used to-
(a) pass the light undeviated
(b) deviate a light path by
reflection only
(c) refract, reflect or diffract
the light depending on experimental condition
(d) deviate a light path by
refraction
ANS: deviate a light path by
refraction
3.
The angle between two lateral surfaces of a prism is called as
(a) angle of prism
(b) angle of refraction
(c) reflecting index of the
prism
(d) dispersion angle
ANS: angle of prism
4. The angle between two plane
rectangular refracting surfaces of a prism is called as
(a) refracting angle of the
prism
(b) angle of refraction
(c) reflecting angle of the
prism
(d) dispersion angle
ANS: refracting angle of the prism
5.
The angle between the directions of the incident ray and the emergent
ray is called-
(a) angle of deviation
(b) angle of refraction
(c) reflecting angle of the
prism
(d) dispersion angle
ANS: angle of deviation
6. For an equilateral prism the
angle of the prism is-
(a) 600
(b) 450
(c) 900
(d) 300
ANS: 600
7.
How many times refraction occurs when a ray passes through a prism?
(a) 1
(b) 4
(c) 3
(d) 2
ANS: 2