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Cadet College
Pre-test Examination-10
Subject-Physics
(Theoretical)
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Subject Code:136
Set-Ka
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Full Marks-40
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Class-X
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Time- 2 hours
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[N.B-Figure in the
right side indicate full marks of the questions. Answer any five questions from each group A and
nay five from group B]
Group-A
1. What
is vernier constant? How does it determine?
1+1=2
2. What
is force? Determine the dimension of force.
1+1=2
3. Show
the validity of equation v = u + at with the help of dimensional equation. 2
4. Prove
that the force acting on any charge placed at any point in the electric field
is
equal
to the product of the intensity and the charge at that point. 2
5. What
is Hydroelectricity? What is meant by efficiency? 1+1=2
6. What do you mean by echo? What is sound
pollution?
1+1=2
7. State the inverse square law of
illumination. What is Solid angle? 1+1=2
8. How electricity is produced by
friction? 2
9. What is solenoid and electromagnet? 2
10. What i9s
diamagnetic and paramagnetic substance? 2
Group-B
11. (a) What is
momentum? State and prove the law of conservation of
momentum. 1+3 = 4
(b)
A body of mass 4kg moving with 12ms-1 meets another body of mass 6kg
coming
from opposite direction with the velocity of 4ms -1 and
becomes a single body. What will be the velocity of the combined body? 2
12. (a) State and explain the Ohm's law. Prove that
I = 
, where electromotive force of a cell is E, internal
resistance of the cell is r and external resistance of the circuit is R.1+3 = 4 (b) The three resistances of value 5
, 10 and 20 are connected in
parallel, determine the equivalent resistances 2
13. (a)
How the equivalent resistance is determined in case of parallel connection of
resistances and show that this is smaller than any of connected resistance? 4
(b) What
will be the cost if a bulb of 60 W runs 5 hours a day for 30 days and the rate
of electric energy Tk. 200 per unit? 2
14. (a) State and
explain the Netware's law of Gravitation and define Gravitational constant G
from it. 2+2 = 4
(b)
Determine the value of G considering the mass of the Earth 5.975 x 1024
kg and uniform sphere of radius 6.37 x 106m and the acceleration due
to gravity 9.8 ms-2 of it surface.
2
15. (a) What do you mean by inertia? Derive
the equation F=ma, where the symbols have their usual meaning 1+3
= 4
(b) A force of 100N acts on a
stationary body of masses 50 kg for 2 seconds. What will be the velocity of the
body at the end of this time? 2
16. (a) Discuss the mechanism for propagation
of sound in air? What is sensation of sound? 3+1
= 4
(b)
Derive the relation V=f
.
2
17. (a)
What is anomalous expansion of water ? Establish the relation between
real expansion and apparent expansion of liquid. 1+3 = 4
(b) What is freon? What is the function
of the compressor of a refrigerator?
2
18.(a) Describe the construction and working
principle of a ammter.
1+3 = 4
(b) The sound wave produced by a toning
fork of frequency 250 HZ describes a distance of 1020 m during 35 in air. Find
the wavelength of the wave in air.
2
19.(a) What is an Otto cycle? Describe with diagram the
construction of petrol
engine. 1+3=4
(b)100g water at
700c is well mixed with 200g
water at 100c what will be the final 2
temperature?
20. (a)What is luminous intensity? Explain mirage in desert. 1+3 = 4
(b) Prove that with clear figure,
focal length of concave mirror is half of radius of
curvature.
2
Cadet
Name :
Cadet No :
Form :
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Pre-test
Examination 2010
Class-
X
Subject: -Physics (Objective)
[NB. Put the tick (
) mark against the correct
answer. Each question carries one mark.]
1. What is the orientation of a wave to the
direction of vibration of particles in Longitudinal wave ?
(a) In parallel (b) At an angle of 450
(c) At any angle (d) At right angle
2. The wavelength of a sound wave produced by a
body in air is 0.2 m. If the speed of sound is 340ms-1 in air, what is its
frequency?
(a) 1600 Hz (b) 1700 Hz
(c) 1800 Hz (d)
1500 Hz
3.Which
one of the following does not represent the characteristic of simple harmonic
motion?
(a) Periodic motion (b) Rotational motion
(c) Vibratory motion (d) Rectilinear motion
4. The speed of sound doesn't depend on ----
(a) Temperature (b) Medium
(c) Pressure (d) Humidity
5.How many laws
obey by the reflection of sound?
(a)
2 (b) 3 (c) 4 (d) 5
6.How long a sound persists in our brain after its hearing?
(a) 1 second (b) 0.1 second
(c) 10
seconds (d) 0.01 second
7.What should be the minimum distance between reflector and listener
in order to hear an echo of sound at 00C temperature?
(a) 15.5 m (b) 16.6 m
(c) 17.7 m (d) 18.8 m
8.What happens to the kinetic energy of atoms
with increase of heat?
(a)Decreases (b)Increases
(c)Remains same (d)All
9.What is called the increase of volume?
(a)Linear expansion
(b)Cubic expansion
(c) Superficial expansion
(d) Caterer expansion
10.Which scientist
invented calorimeter?
(a)Joule (b)Regnault
(c)Royal (d)Charls
11.Which one is
good conductor?
(a) Mercury (b) Wood
(c) Cork (d) Glass
12.Value of thermal
conductivity depends on
(a) Length of the conductor
(b) Area of cross section of the conductor
(c) Volume of the conductor
(d) Material of the conductor
13.Forth stroke is called
(a)Working stroke (b) Changing stroke
(c) Compression stroke (d) Exhaust stroke
14.Heat engine
converts which energy into mechanical energy?
(a)Sound energy (b)
Electricity
(c)Mechanical energy (d) Magnetic energy
15.
What will be the illumination on a page of a book placed at a distance 5m from
a candle of luminous intensity 100cd ?
(a) 4 cdm-2
(a) 4 cdm2
(a) 8 cdm-2 (a) 6 cdm2
16. An object is placed on the principal
axis between centre of curvature and principal focus of a concave mirror. Where
would be the position of the image?
(a) Behind the mirror
(b) Between centre of curvature and infinity.
(c) At the centre of curvature
(d) Between the centre of curvature and principal focus.
17. On what factor the refractive index of
a medium depends?
(a) Density of the medium
(b) Angle of incidence
(c) Colour of light
(d) Angle of refraction.
18. Which one acts
as a mirror?
(a) a plane paper (b)a wall
(c)surface of calm water (d)Ground glass
19. For
small angular displacement, what is the relation between the time period T and
effective length L of simple pendulum at any place?
(a) Ta
(b) Ta
L
(c) 
(d) Ta
L2
20. Which quantities have same unit
dimension?
(a) Mass
and Weight
(b) Velocity
and Displacement
(c) Work and Energy
(d) Heat
and Temperature
21. What is the
derivation of 1N?
(a) 
(b) 
(c) 
(d) 
22. The velocity of a car becomes 10ms-1
after travelling 9m by pressing the acceleration, which can produce
acceleration of 2ms-2. What was the velocity of the car at that
moment of pressing the acceleration?
(a)
7ms−2 (b)
8ms−2
(c) 4ms−1 (d) 3ms−2
23. Which is the equation for the volume of a
cylinder?
(a) 
(b) 
(c) 
(d) 
24. What is the are pressure at
00C temperature in the surface of the earth?
(a) 1.01´105 Pa (b)
1.01´104 Pa
(c) 1.01´103 Pa (d)
1.01´102 Pa
25. During floatation how many
parts of ice block remains submerged?
26. Who
gave the prediction regarding solar ellipse?
(a) Bacquerel
(b) Democritus
(c) Aristarchus
(d) Thales
27. Who
told that "the sun is at the centre of the solar system and the earth and
the other planets are revolving around the sun"?
(a) Aristotle
(b) Newton
(c) Democritus
(d) Aristarchus
28. Which one is the value of "g" in the
poles?
(a) 9.823ms−2 (b) 9.382ms−2
(c) 9.832ms−2 (d) 9.806ms−2
29. What is called the point at which weight always
acts?
(a) Centre
of gravity
(b)
Centre of gravitational
(c) Centre
of weight
(d) Central
point
30. What
is the value of permeability of vacuum?
(a) 8.854´10--12 C2 N−1m-2
(b) 8.854´10--12 C2 N−2m-2
(c) 8.854´10--10 C N−1m-2
(d) 8.854´10--10 C2 N−1m-2
31. At
constant temperature, if the potential difference is V, and the current I flow
through a resistance R, thus what will be the relation among them?
(a) 
(b) V=RI
(c) VI=R
(d) VR=I
32. What will happen, if the potential
difference between two bodies maintained-
(a) Electron
flow will end
(b) Electron
flow will finished
(c) Electron
flow will end
(d) Electron flow will continue for a certain
time
33 In Alinco-alloy which one will not found?
(a) Nickel
(b) Cobalt
(c) Copper
(d) Barium
34. The
equivalent resistance will be increased in which type of connection?
(a) Series
connection
(b) Parallel
connection
(c) Combined
connection
(d) Both
series and parallel connection
35. Which one is the unit of specific resistance?
(a) Ohm-m2
(b) Ohm-m
(c) Ohm2-m
(d) Ohm−2-m
(b) 
(c) 
(d) 
