Download Physics_1995_Paper_II_+_ANS

PAPER II.
If necessary, take g=10ms-2.
All the cells are assumed to have negligible internal resistance.
1. Which of the following pairs of physical quantities has the same units?
A.Charge and current
B.Frequency and time
C.Kinetic energy and heat
D.Moment and momentum
E.Work and potential difference
2.
In the above diagram, the two block are connected by a light string S.
They move with uniform acceleration of 2 ms-2 under the action of a
constant force F. What will the accelerations of the blocks become if S
suddenly breaks?
2 kg block….…….4 kg block
A. 6ms-2……………………………………...0ms-2
B. 6ms-2………………………………………2 ms-2
C. 2 ms-2……………………………………..0ms-2
D. 2ms
-2………………………………………
2ms
-2
E. 0ms-2………………………………………3 ms-2
3.A stone is thrown vertically upwards and it finally falls back to the starting
point. Assume air resistance is negligible .Which of the following statements
is/are true throughout the motion?
(1)the acceleration of the stone is constant.
(2)The total energy of the stone is conserved.
(3)The momentum of the stone is conserved.
A.(1)only
B.(3)only
C.(1)and(2)only
D.(2)and(3)only
E.(1),(2)and(3)
4.An object starts from rest and moves with uniform acceleration along a straight line.
Which of the following graphs concerning the motion of the object is/are correct?
(s=displacement, v=velocity, t=time)
A. (1)only
B. (3)only
C. (1)and(2)only
D. (2)and(3)only
E. (1),(2)and(3)
5.Two objects of different masses are released from rest at the same height .
Assume air resistance is negligible. Which of the following statements is/are
correct?
(1)A great gravitational force is acting on the object with greater mass.
(2)They take the same time to reach the ground.
(3)They have equal velocities when they reach the ground.
A. (1)only
B. (2)only
C. (1)and(3)only
D. (2)and(3)only
E. (1),(2)and(3)
6.
A trolley is placed on a horizontal ground. A force F inclined at an angle θ to the
horizontal acts on the trolley .What is the horizontal component of F that
pulls the trolley towards the right?
A. Fθ
B. Fsinθ
C. Fcosθ
D. F/sinθ
E. F/cosθ
7.A car moves with a speed 30 km h-1. The driver applies the brake and the car is stopped
in a distance? Assume that the same constant braking force is applied in both cases.
A. 12m
B. 24m
C. 48m
D. 72m
E. 96m
8.
The above diagram shows the variation of the velocity of an object with time. What is the
distance traveled by the object in the first 3 seconds?
A. 5m
B. 15m
C. 25m
D. 30m
E. 45m
9.
A bullet of mass 0.02 kg traveling at 450 ms-1 enters a wooden block as shown in Figure (a)
and leaves it with a speed 400 ms-1. In Figure (b), What is the maximum number of
identical blocks that the same bullet can pass through?
A. 3
B. 4
C. 5
D. 9
E. 10
10.
A trolley runs down a friction-compensated runway as shown above. Which of the
following statements is true?
A.The kinetic energy of the trolley increases with time.
B.The potential energy of the trolley increases with time.
C.The sum of kinetic and potential energies of the trolley remains unchanged.
D.The frictional force acting on the trolley is zero.
E.The resultant force acting on the trolley is zero.
11.
The above diagram shows a block resting on the ground.
Let W be the weight of the block,
F be the gravitational force acting on the earth by the block ,and
R be the force acting on the block by the ground.
Which of the following pairs of forces is/are action and reaction pair(s) according to
Newton’s third law of motion?
(1)R and W
(2)W and F
(3)F and R
A.(1)only
B.(2)only
C.(3)only
D.(1)and(2)only
E.(2)and(3)only
12.
Which of the following is/are the advantage(s) of using method (1) to lift the load over
method (2)?
(1)The input energy required is smaller.
(2)The effort required is smaller.
(3)The distance traveled by the effort is smaller.
A.(2)only
B.(3)only
C.(1)and(2)only
D.(1)and(3)only
E.(1),(2)and(3)
13.A magnifying glass is used to read some small print in a book. The glass is placed 3
cm from the book and the magnification is 3. What is the distance between the book and
the image of the point?
A. 1cm
B. 3cm
C. 6cm
D. 9cm
E. 12cm
14.Which of the following ray diagrams correctly shows the working principle of a
prismatic periscope?
15.
An object O forms an image I in a convex mirror. The above diagram shows how two rays
from the top of the object are reflected by the mirror . Which of the following distances
denotes the focal length of the mirror?
A. PS
B. PT
C. QR
D. QS
E. QT
16.
In the above diagram, F, F’ are the foci of the convex lens and AB is an incident ray.
Which of the following paths best represents the emergent ray?
A.P
B.Q
C.R
D.S
E.T
17.
The above diagram shows the image formation of a distant object by an eye. Which of the
following statements is true?
A.The eye is short-sighted and can be corrected by a diverging lens.
B.The eye is short-sighted and can be corrected by a converging lens.
C.The eye is long-sighted and can be corrected by a diverging lens.
D.The eye is long-sighted and can be corrected by a converging lens.
E.The eye is normal.
18.Which of the following statements about heat is/are true?
(1)Heat is used to describe the total energy stored in a body .
(2)Heat is used to describe the energy transferred from one body to another as a result of a
temperature difference between them.
(3)A body’s internal energy is increased when it is heated.
A.(1)only
B.(2)only
C.(1)and(3)only
D.(2)and(3)only
E.(1),(2)and(3)
19.Which of the following substances is a liquid at room temperature (about
20℃)?
Substance…….. Melting point/℃ ………Boiling point/℃
A. P………………… 25…………………….. 444
B. Q ………………..-39………………..…… 357
C. R …………………44 ……………………..280
D. S ………………..-218…………………… -183
E. T ………………..1083 ……………………2236
20.
The above apparatus is used to study the relationship between the pressure and volume of a
fixed mass of gas at constant temperature. Which of the following can improve the
accuracy of the experiment?
(1)Pressing the piston quikly
(2)Using a large syringe
(3)Using a short length of rubber tubing
A.(1)only
B.(3)only
C.(1)and(2)only
D.(2)and(3)only
E.(1),(2)and(3)
21.
The above graph shows the result obtained when an experiment is performed to study
Boyle’s Law. What do the axes of the graph represent?
Y axis
x axis
A.
Volume
Temperature
B.
Volume
1/temperature
C.
Pressure
Volume
D.
Pressure
1/Volume
E.
Temperature
Pressure
22.The melting point of copper is 1080℃ and its specific latent heat of fusion is 2.1×10
5
Jkg-1. How much energy is needed to melt 0.5kg of copper at its melting point?
A.2.1×105/0.5J
B.0.5×2.1×105J
C.2.1×105/0.5×1080J
D.0.5×2.1×105/1080J
E.0.5×2.1×105×1080J
23.A fixed mass of gas is heated at a constant pressure. Which of the following statements
is/are correct?
(1)The average speed of the gas molecules increases.
(2)The average spacing between the gas molecules increases.
(3)The number of gas molecules remains unchanged.
A.(2)only
B.(3)only
C.(1)and(2)only
D.(1)and(3)only
E.(1),(2)and(3)
24.
A train of water waves is generated in a ripple tank. The above graph shows the variation
of the displacement of a cork placed in the water with time .Find the frequency of the
waves.
A.0.2Hz
B.0.25Hz
C.4Hz
D.5Hz
E.10Hz
25. When a sound wave travels from air into water, its wavelength is increased by five
times. If the speed of sound in air is 330 ms-1, find the speed of the sound wave in water.
A.66ms
-1
B.165 ms-1
C.330 ms-1
D.1650 ms-1
E. It cannot be determined since the frequency of the sound wave is not given.
26.Which of the following cannot travel through a vacuum?
A.β particles
Bγ rays
C.Infra-red
D.Microwaves
E.Ultrasonics
27.
In the above circuit, the reading of ammeter A1 is 0.6A. Find the potential difference
between points P and Q.
A.3V
B.6V
C.9V
D.12V
E. It cannot be determined since the e.m.f. of the battery is not given.
28.Which of the following values is equivalent to one kilowatt hour?
A.1000W
B.1000J
C.3600J
D.3.5×106W
E.3.5×106J
29.
Two insulated uncharged metal spheres X and Y are in contact with each other. A
positively charged rod is brought near X as shown above .Which of the following diagrams
correctly shows the distribution of charges on the spheres?
30.
A Christmas tree is illuminated with four strings of light bulbs. Each string has ten
identical light bulbs connected in series as shown above. If one light bulb suddenly burns
out , Which of the following will happen?
A.Only that light bulb will go out.
B.One light bulb in each string will go out .
C.One string of light bulbs will go out .
D.All the light bulbs will go out .
E.Half of the light bulbs will go out .
31.Which of the following involve(s) the application of electromagnets?
(1)A ticker-tape timer
(2)A moving-coil loudspeaker
(3)A telephone receiver
A.(2)only
B.(3)only
C.(1)and(2)only
D.(1)and(3)only
E.(1),(2)and(3)
32.Which of the following can increase the sensitivity of a galvanometer?
(1)Increasing the strength of the magnet
(2)Using a weaker hairspring
(3)Connecting a shunt in parallel with the galvanometer
A.(1)only
B.(3)only
C.(1)and(2)only
D.(2)and(3)only
E.(1),(2)and(3)
33.
In the above circuit, the ammeters are of negligible resistance. Which of the following
statements is/are true if switch S is closed?
(1)The reading of ammeter A1 decreases.
(2)The reading of ammeter A2 increases.
(3)The reading of the voltmeter remains unchanged.
A.(1)only
B.(3)only
C.(1)and(2)only
D.(2)and(3)only
E.(1),(2)and(3)
34.
The diagram above shows a simple electromagnet. Which of the following can increase the
strength of the electromagnet?
(1)Decreasing the resistance of the variable resistor
(2)Replacing the soft iron core with one made of steel
(3)Replacing the battery with a 50 Hz a.c. source
A.(1)only
B.(3)only
C.(1)and(2)only
D.(2)and(3)only
E.(1),(2)and(3)
35.
The diagram above shows a three-pin plug and the wires connecting to it .To Which of the
pins should each of the wires X, Y and Z be connected?
P….. Q….. R
A.X ..Y… Z
B.Y ..X… Z
C.Y.. Z…. X
D.Z ..X …Y
E.Z ...Y… X
36.
An a.c. supply is connected to a diode and a resistor R as shown above. Which of the
following graphs shows the variation of the voltage across R with time?
37.
The above diagram shows the display on a CRO with the time base
set at 10 ms cm-1 and Y-gain at 0.5 V cm-1. Find the peak voltage
and frequency of the signal applied across the Y-plates.
Peak voltage/V Frequency/Hz
A
1
16.7
B
1
25
C
1
50
D
2
25
E
2
30
38.
Which of the following logic gates is equivalent to the above combination of
logic gates?
A. A NOT gate
B. An OR gate
C. An AND gate
D. A NOR gate
E. A NAND gate
39. Which of the following statements about X-rays is/are correct?
1. X-rays consist of fast moving electrons.
2. X-rays can blacken photographic films.
3. X-rays can be used to detect weapons hidden in luggage.
A. (1)only
B. (2)only
C. (1)and(3)only
D. (2)and(3)only
E. (1),(2)and(3)
40.
A radioactive nuclide W decays to a nuclide Z by emitting one α-and
two β-particles as shown above. Which of the following statements about
nuclides W, X, Y and Z is/are correct?
1. W and Z are isotopes.
2. X has the greatest atomic number.
3. Y has the greatest mass number.
A. (1)only
B. (3)only
C. (1)and(2)only
D. (2)and(3)only
E. (1),(2)and(3)
Directions: Each question below( Questions 41-45) consists of two
statements. Decide whether each of the two statements is true or false.
If both are true, then decide whether or not the second statement is a
correct explanation of the first statement. Then select one option A-E
according to the following table:
A
1st statement
2nd statement
True
True
2nd statement is a correct explanation
of the 1st statement
B
True
True
2nd statement is not a correct
explanation of the 1st statement
C
True
False
__
D
False
True
__
E
False
False
__
st
nd
1 statement
41
2 statement
The image of an object formed by a concave The image of an object formed by a
lens cannot be photographed with a camera. concave lens cannot be formed on a
screen.
42
43
44
Steam at 1000C causes more severe burns to A large amount of latent heat of
the skin than boiling water at the same
vaporization is released when steam
temperature.
condenses.
Diffraction of light is more diffcult to
Sound waves are longitudinal but
observe than diffraction of sound.
light waves are transverse.
The resistance of a “200V,40W”bulb
The current flowing through the
when they work at their rated values.
“200V,100W”light bulb is greater
than that of the “200V,40W”bulb
when they work at their rated values.
45
particles can be diflected by a magnetic
field while γ rays cannot.
KEY TO PAPER II:
1.
2.
3.
4.
5.
6.
7.
8.
9.
C
A
C
E
E
C
C
C
B
particles travel at a lower speed
than γ rays
10.E
11.B
12.A
13.C
14.A
15.D
16.B
17.A
18.D
19.B
20.D
21.D
22.B
23.E
24.D
25.D
26.E
27.A
28.E
29.C
30.C
31.E
32.C
33.D
34.A
35.E
36.C
37.B
38.E
39.D
40.C
41.D
42.A
43.B
44.D
45.B