# Sulvme!

### Unified Tertiary Matriculation Examination Physics 2011

1:

Which question paper type of physics is given to you?

A:

Type A

B:

Type B

C:

Type C

D:

Type D

E:

No option

2:

A carpenter on top of a roof 20.0 m high dropped a hammer of mass 1.5 kg and it fell freely to the ground. The kinetic energy of the hammer just before hitting the ground is

(g $\approx$ 10 ms-2)

A:

300J

B:

450J

C:

600J

D:

150J

E:

No option

3:

Two balls X and Y weighing 5 g and 50 kg respectively were thrown up vertically at the same time with a velocity of 100ms-1. How will their positions be one second later?

A:

X will be 500m ahead of Y

B:

X and Y will both be 500m from the point of throw

C:

X and Y will be 500m from each other

D:

Y will be 500m ahead of X

E:

No option

4:

A man standing on a lift that is descending does not feel any weight because

A:

There is no reaction from the floor of the lift

B:

There is no gravitational pull on the man in the lift

C:

The inside of the lift is airtight

D:

The lift is in vacuum

E:

No option

5:

The diagram below shows two vectors at right angles to each other. The value of the resultant vector is

A:

12.0N

B:

13.0N

C:

14.0N

D:

10.0N

E:

No option

6:

An object of mass 2 kg moves with a velocity of 10 ms-1 round a circle of radius 4m. Calculate the centripetal force on the object

A:

50N

B:

40N

C:

25N

D:

100N

E:

No option

7:

If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?

$\left [ g \approx 10ms^{-2} \right ]$

A:

45m

B:

60m

C:

90m

D:

30m

E:

No option

8:

The diagrams below show the positions of a cone. The position which can be described as neutral equilibrium is represented as

A:

Y and Z

B:

Y and X

C:

Z only

D:

X only

E:

No option

9:

If a tube of small radius opened at both ends is placed in a liquid, the liquid will

A:

fall below the liquid level if the liquid does not wet the glass

B:

rise above the liquid level if the liquid does not wet the glass

C:

remain at the same level irrespective of whether the liquid wets the glass or not

D:

fall below the liquid level if the liquid wets the glass

E:

No option

10:

I.  Density of the liquid

II.  Depth below the surface of the liquid

III. Surface area of the liquid

In which of the statements above will pressure be dependent?

A:

I, II and III

B:

I and III only

C:

I and II only

D:

II and III only

E:

No option

11:

I. High thermal capacity

II. High sensitivity

IV. Accuracy over a wide range of temperatures

From the statements above, the qualities of a good thermometer are

A:

I, III and IV

B:

II, III and IV

C:

I and II

D:

I, II, III and IV

E:

No option

12:

A machine is used to lift a load of 20N through a height of 10m. If the efficiency of the machine is 40%, how much work is done?

A:

300J

B:

120J

C:

80J

D:

500J

E:

No option

13:

Which of the following could be effectively used to reduce friction?

A:

Water

B:

Petrol

C:

Kerosene

D:

Grease

E:

No option

14:

A copper wire was subjected to a tensile stress of $7.7 \times 10^{7}NM^{-2}$. Calculate the tensile strain of the wire.

(Young modulus = $1.1 \times 10^{11}NM^{-2}$)

A:

$7.0 \times 10^{-4}$

B:

$2.2 \times 10^{-4}$

C:

$2.0 \times 10^{-5}$

D:

$7.0 \times 10^{-3}$

E:

No option

15:

An object weighs 22kg in water and 30kg in air. What is the upthrust exerted by the liquid on the object?

(g $\approx$ 10ms-2)

A:

220N

B:

80N

C:

50N

D:

520N

E:

No option

16:

A block of aluminium is heated electrically by a 30W heater. If the temperature rises by 100C in 5 minutes, the heat capacity of the aluminium is

A:

100 JK-1

B:

200 JK-1

C:

900 JK-1

D:

90 JK-1

E:

No option

17:

Perfect emitter or absorber of radiant energy is a

A:

white body

B:

red body

C:

conductor

D:

black body

E:

No option

18:

The phenomenon that shows that increase in pressure lowers the melting point can be observed in

A:

coagulation

B:

regelation

C:

sublimation

D:

condensation

E:

No option

19:

If the volume of a gas increases steadily as the temperature decreases at constant pressure, the gas obeys

A:

pressure law

B:

charles' law

C:

Graham's law

D:

Boyle's law

E:

No option

20:

Steam burn is more severe than that of boiling water because

A:

water boils at a higher temperature

B:

steam burn is dependent on relative humidity

C:

steam burn is independent of relative humidity

D:

steam possesses greater heat energy per unit mass

E:

No option

21:

Which of the following types of waves needs a medium for prepration?

A:

B:

X - rays

C:

Sound waves

D:

Light waves

E:

No option

22:

The ground is always cold at night because the

A:

sun no longer shines at night

B:

atmosphere reflects the sun's energy at night

C:

atmosphere absorbs the sun's energy at night

D:

earth radiates heat to the atmosphere at night

E:

No option

23:

A metal of volume 40cm3 is heated from 300C to 900C, the increase in volume is

(Linear expansivity of the metal = $2.0 \times 10^{-5}K^{-1}$)

A:

1.20cm3

B:

0.40cm3

C:

0.12cm3

D:

4.00cm3

E:

No option

24:

I. Change of state

II. Diffusion

IV. Osmosis

Which of the processes above can be explained using the kinetic theory?

A:

I, III and IV

B:

I, II and IV

C:

I, II, III and IV

D:

I, II and III

E:

No option

25:

When the human eye loses its power of accomodation, the defect is known as

A:

astigmatism

B:

long-sightedness

C:

short-sightedness

D:

presbyopia

E:

No option

26:

A length of wire has a frequency of 255Hz when stretched by a force of 225N. If the force increases to 324N, what is the new frequency of vibration

A:

488 Hz

B:

356 Hz

C:

306 Hz

D:

512 Hz

E:

No option

27:

A certain far-sighted person cannot see objects that are closer to the eye than 50 cm clearly. Determine the power of the converging lens which will enable him to see at 25cm

A:

0.03 D

B:

0.04 D

C:

0.06 D

D:

0.02 D

E:

No option

28:

Which of the following electromagnetic waves has the highest frequency?

A:

Infrared - rays

B:

X - rays

C:

Ultra - violet rays

D:

E:

No option

29:

When a red rose flower is observed in blue light, what colour does the observer see?

A:

Magenta

B:

Yellow

C:

Red

D:

Blue

E:

No option

30:

The eclipse of the sun occurs when the

A:

moon is not completely hidden in the earth's shadow

B:

moon's umbra falls on some part of the earth

C:

moon is between the sun and the earth

D:

earth is between the sun and the moon

E:

No option

31:

A cannon is fired from X. After how long is the sound heard at a town Y 4.95km away?

(Velocity of sound in air = 330ms-1)

A:

12s

B:

15s

C:

30s

D:

10s

E:

No option

32:

An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15cm, what is the object distance?

A:

16cm

B:

14cm

C:

10cm

D:

25cm

E:

No option

33:

The capacitance of a parallel plate capacitor is $20 \upsilon F$ in air and $60 \upsilon F$ in the presence of a dielectric. What is the dielectric constant?

A:

3.0

B:

2.0

C:

0.3

D:

6.0

E:

No option

34:

In the circuit below, three resistors, $2 \Omega , 4 \Omega, and 12 \Omega$ are connected in parallel and a 12V battery is connected across the combination. The current flowing through the $12 \Omega$ resistor is

A:

3.2 A

B:

9.6 A

C:

14.4 A

D:

1.0 A

E:

No option

35:

If the charge of electricity per kWh is #4, what is the cost of operating an electrical appliance rated 2.50V, 2A for 6 hours ?

A:

#16

B:

#24

C:

#28

D:

#12

E:

No option

36:

The correct expression for the potential at a point, distance r from a chaarge q, in an electric field is

A:

fg

B:

$\frac{q^{2}}{4 \pi \varepsilon _{0}r^{2}}$

C:

$\frac{q}{4 \pi \varepsilon _{0}r}$

D:

$\frac{q^{2}}{4 \pi \varepsilon _{0}r}$

E:

No option

37:

Three similar cells each of e.m.f 2V and internal resistance $2 \Omega$ are connected in parallel, the total e.m.f and total internal resistance are respectively

A:

$2V, 6.0 \Omega$

B:

ghg

C:

$6V, 6.0 \Omega$

D:

$2V, 0.7 \Omega$

E:

No option

38:

In homes, electrical appliances and lamps are connected in parallel because

A:

less current will be used

B:

less voltage will be used

C:

parallel connection does not heat up the wires

D:

series connection uses high voltage

E:

No option

39:

Two resistors $5 \Omega$ and $10 \Omega$ are arranged first in series and later in parallel to a 24 V source. The ratio of total power dissipated in the series and parallel arrangements respectively is

A:

50:1

B:

3:5

C:

5:3

D:

1:50

E:

No option

40:

Which of the following will be applied when a metal Y is used to electoplate another metal X in electrolysis ?

A:

Y is the cathode and X is the anode

B:

Y is the anode and very high current is used

C:

X is the anode and very high current is used

D:

X is the anode and Y is the cathode

E:

No option

41:

A radioactive isotope has a decay constant of 10-5s-1. Calculate its half life

A:

$6.93 \times 10^{4}s$

B:

$6.93 \times 10^{-6}s$

C:

$6.93 \times 10^{-5}s$

D:

$6.93 \times 10^{5}s$

E:

No option

42:

Which of the following is a property of steel?

A:

It can be used for making permanent magnets

B:

It can easily be magnetized and demagnetized

C:

It cannot retain its magnetism longer than iron

D:

It can be used for making temporary magnets

E:

No option

43:

If the threshold frequency for tungsten is $1.3 \times 10^{15} Hz$, what is its work function ?

(h = ***)

A:

$8,58 \times 10^{-17}J$

B:

$8.85 \times 10^{-18}J$

C:

$8.58 \times 10^{-19}J$

D:

$8.58 \times 10^{-15}J$

E:

No option

44:

In an a.c circuit, the ratio of r.m.s value to peak value of current is

A:

$\frac{1}{\sqrt{2}}$

B:

$\sqrt{2}$

C:

2

D:

$\frac{1}{2}$

E:

No option

45:

Two inductors of inductances 4H and 8H are arranged in series and a current of 10A is passed through them. What is the energy stored in them?

A:

133 J

B:

250 J

C:

500 J

D:

50 J

E:

No option

46:

Under which of the following condition do gases conduct electricity ?

A:

High pressure and low p.d

B:

High pressure and high p.d

C:

Low pressure and low p.d

D:

Low pressuer and high p.d

E:

No option

47:

In measuring high frequency a.c, the instrument used is the

A:

moving iron ammeter

B:

hot wire ammeter

C:

d.c ammeter

D:

moving coil ammeter

E:

No option

48:

The bond between silicon and germanium is

A:

dative

B:

electrovalent

C:

covalent

D:

ionic

E:

No option

49:

Which of the following materials has an increase in resistance with temperature ?

A:

Wood

B:

Electrolyte

C:

Water

D:

Metals

E:

No option

50:

The electrical properties of germanium can be altered drastically by the addition of impurities. This process is referred to as

A:

amplification

B:

doping

C:

saturation

D:

bonding

E:

No option