"OM Sai Ram"
"Er.Shyam Pachori Science Classes"
PSA Sample Paper
Time :1Hr 30Min
Subject :Science Max Marks 50
Note:Each Question is of 1.25 marks only.
Qualitative and Logical Reasoning:
Q.1
Mahima lives in Chennai in a sea-facing house. While going to her friend‟s
house, she turns to her right. After moving to 70 mtr. in that direction, she
again turns to her right.Which direction is she facing now?
a)
North
b)
West
c)
East
d)
South
Q.2
The term “Global Warming” means
a)
Quick melting of polar ice sheets.
b)
Depletion of Ozone layer.
c)
High temperature in Torrid Zone.
d)
General rise in temperature due to CO2
Q.3
These days yellow lamps are frequently used as street light. Which one of
following is used in the lamp:-
a)
Sodium
b)
Neon
c)
Hydrogen
d)
Nitrogen
Q.4
Which side of box will exert more pressure on table top?
(i)
A
(ii)
B
(iii)
Both exert same pressure
(iv)
None of these
Q.5
40 grams of salt is dissolved in 20 litres of water. 10 litres of this solution
is then removed and an additional 10 litres of water is added. The final
concentration of salt in the solution is
1)
0.5 g/L 2) 1 g/L 3) 1.33 g/L 4) 2 g/L
Q.6
A prism of 6° angle gives a deviation of 3°. The refractive index of the
material of prism is :
a) 1.5 b) 2 c) 0.5 d) 1.8
Q.7
The magnitude of momentum of a particle is increased by 100%. The increase in
its kinetic energy is :
a)
100% b) 200% c) 300 %
d) 400%
Q.8
Which of the following properties of a wave does not change with the change in
medium?
a)
Frequency b) Velocity c) Wavelength d) Amplitude
Q.9
A negatively charged particle projected towards east is deflected towards north
by a magnetic filed. The field may be:
a)
Towards west b) Towards south c) Upwards
d) Downwards
Q.10
As compared to 12C atom, 14C atom has :
a)
Two extra protons and two extra electrons
b)
Two extra protons but no extra electron
c)
Two extra neutrons but no extra electron
d)
Two extra neutrons and two extra electrons
Q.11
X-rays can be deflected :
a)
by an electric field
b)
by a magnetic filed
c)
by an electric as well as magnetic filed
d)
neither by an electric nor by a magnetic field
Q.12
Tissues in the organs of living beings are made up
of
: a) fat b) carbohydrate c) proteins
d) vitamins
Q.13
The isotopes of an element have different :
a)
number of electrons and neutrons
b)
number of protons and neutrons
c)
number of electrons and protons
d)
number of neutrons only
Q.14
Milk is a kind of : a) Sol b) Gel
c) Emulsion d) Mixture
Q.15
In the atom bomb dropped by Americans in 1945 on Nagasaki, Japan, the
fissionable material used was A.
Helium 4 B. Plutonium 239 C. Uranium 235 D. Uranium 233
Q.16
Wavelength of red light is λ r, violet rays is λ v and X -ray is λ x then the
order of
wavelengths
is
(A).
λx >λv >λr (B). λv >λx >λr (C). λr >λx >λv (D). λr >λv
>λx
Q.17
B.P. and M.P. of inert gases are A. high B. low C. very high D. very low
Q.18
The laughing gas is
A.
nitrous oxide B. nitric oxide C. nitrogen trioxide D. nitrogen pentaoxide
Q.19
Ordinary glass is
A.
sodium silicate B. calcium silicate C.
calcium and Sodium silicate D. copper
silicate
Q.20
Two heater wires of equal length are first
connected in series and then in parallel. The
ratio
of heat produced in the two cases is
A.
2 : 1 B. 1 : 2 C. 4 : 1 D. 1 : 4
Q.21 Whose name is not associated with the
development of Periodic Table? A. Prout's B. Newlands C. Rutherford D. Loother
Meyer
Q.22 The pH of blood is
(A). less than 6
(B). greater than 7 and less than 6(C). greater than 8 and less than 9
(D). greater than 10
Q.23 If the
velocity time graph of a body is a straight line sloping downwards, the body
has
A. acceleration B. declaration C. zero acceleration
D. constant acceleration
Q.24 The metal that is extracted from sea water is
A. Mg B. Au C. Ca D. Fe
Q.25 If there are no atmosphere the average
temperature on the surface of the earth would be
a) lower b) higher c) same as now d) 0⁰C
Q.26 It is possible to observe total internal reflection
when light travels from
a) air to water b) air to glass c) water to glass d)
glass to water
Q.27
What is the momentum of an electron
moving with speed of 2x1010 m/s?
(a) 4.92x10-24 kg
m/s (b) 1.82x1020 kg m/s (c) 3.2x1025 kg m/s (d) 3.2 10-9 kg m/s
Q.28 Melting is
(a) an endothermic process
(b) an exothermic process
(c) both
(d) None
Q.29 The solid that would sublime on
heating is
(a) wax
(b) solid carbon dioxide
(c) ice
(d) butter
Q.30 Which of the
following is not a unit of time?
(a) Second
(b) Parsec
(c) Year
(d) Light year
Q.31When a fuse is rated 8 A, it means
_____________.
1. it will not work if current is less than 8 A
2. it has a resistance of 8 Ω
3. it will work only if current is 8 A
4. it will melt if current exceeds 8 A
1. it will not work if current is less than 8 A
2. it has a resistance of 8 Ω
3. it will work only if current is 8 A
4. it will melt if current exceeds 8 A
Q.32 Nature of sound wave is (A) transverse (B) longitudinal (C)
electromagnetic (D) seismic
Q.33 When a body falls
freely towards the earth, then its total energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and
then decreases
Q.34 An iron sphere of
mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both
spheres are dropped simultaneously from a tower. When they are 10 m above the
ground, they have the same
(a)
acceleration
(b)
momentum
(c)
potential energy
(d)
kinetic energy
Q.35 The diameter of the
nucleus of an atom is of the order of
(A) 10 -31 m
(B) 10 -25 m (C) 10 -21 m (D) 10 -15m.
Q.36 An
electron enters a magnetic field at right angles to it as shown in fig. The
direction of the force acting on
the electron will be:
(a)
to
the right (b) to the left (c) out of the page (d) into the page
(a)
Plane (b) Concave (c) Convex (d) Plano
convex
Q.38
In torches, search lights and head lights of vehicles the bulb is placed
(a)
Between pole and focus
(b)
Very near to the focus
(c)
Between focus and centre of curvature
(d)
At centre of curvature
Q.39
Blue color of the sky is due to the
phenomena of
(a) Reflection
(b) Refraction
(c) Scattering
(d) Dispersion
(b) Refraction
(c) Scattering
(d) Dispersion
Q.40 The magnitude of electric current is
increasing from A towards B. Direction of induced current in loop will be
(a)
Clockwise
(b)Anticlockwise(c) Cannot determined
(d) None of these
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