4. If we use plus and minus signs to indicate the directions of velocity and acceleration in one dimension, in which of the following situations does the object speed up?

a.
negative velocity and negative acceleration

b.
positive velocity and negative acceleration

c.
positive velocity and zero acceleration

d.
negative velocity and positive acceleration

e.
none of a, b, c and d

1 points  

QUESTION 2

Define:



1. An Ideal Fluid  



2. gauge pressure



















































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10 points  

QUESTION 3

A car is driven 40 km east and 30 km north. the car finally drives 50 km NE

True

False

2 points  

QUESTION 4

kettle K takes twice as long to boil the same amount of water as does kettle M. If M uses 400 kJ of energy to do the job, kettle K needs in kJ:

a.
200

b.
400

c.
800

d.
1600

e.
None of a, b, c and d


1 points  

QUESTION 5

Two vectors of equal magnitude are added together. the magnitude of their resultant is 10. If one of the vectors is directed due north, and the other bone is at 20° north of eat, determine the common magnitude of two vectors as well as the direction of their resultant.

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5 points  

QUESTION 6

if three vectors with magnitude 30, 40, 50 are added together, which of the following cannot represent the magnitude of the resultant?

a.
0

b.
30

c.
50

d.
150

e.
None of a, b, c and d

1 points  

QUESTION 7

Cool drink enters the mouth through a drinkng straw when the drinker sucks because

a.
the straw acts as a capilary tube

b.
the drink is pushed by atmospheric pressure

c.
the drink is drawn up by an upward sucking force

d.
trhe foces of cohesion are reduced by the low sucking pressure

e.
none of a, b, c and d

1 points  

QUESTION 8

Object A of mass 4 kg moves south at 9 m/s and collides had-on with object B of mass 8 kg moving north at 12 m/s. After the collision, A moves north at 7 m/s. Calculate the magnitude and direction of the velocity of B after collision

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10 points  

QUESTION 9

when a object is
in a fluid, it experiences an
equal to the
of the fluid
10 points  

QUESTION 10

which of the following arrangement provides an effective resistance of 10 Ω?



A.
A

B.
B

C.
C

D.
D

E.
None of A, B, C and D


1 points  

QUESTION 11

An electroplating process supplies a coating thickness of 800 nm. Calculate the area which would be covered using 1 kg of gold, mindful that the density of gold is 19300 kg/m3                     [4]

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4 points  

QUESTION 12

How long will it take will it take a 1500 kW motor to lift a 400 kg piano to a sixt-storey window 20 m above the ground?

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5 points  

QUESTION 13

A fish rests on the bottom of a bucket of water while the bucket is being weighed on a scale. When the fish begins to swim around, the scale reading changes

True

False

2 points  

QUESTION 14

A total force of 500 N is applied to pull a box on a rough surface along a distance of 60 m. If 1000J of work are done against friction, the total kinetic energy of the box at the end of the trip is:



a.
3000J

b.
20000J

c.
29000J

d.
59000J

e.
None of a, b, c and d


1 points  

QUESTION 15

200 kilolitres of water was consumed inour house last month. this quantity of water corresponds to:

a.
20000 litres

b.
200 m3

c.
0.2 m3

d.
200000 mm3

e.
None of a, b, c and d

1 points  

QUESTION 16

A 60 g tennis ball lands on the racket of a player with the speed of 108 km/h, and the player returns the ball with a speed of 90 km/h. the ball has been in contact during 0.2 s with the racket of the player. Determine:
The change in momentum during the return of the ball (3 marks)
The average force deployed by the player to return the ball (2 marks)


2. In the circuit here given, voltmeter V3 reds 5V

2.1 Determine the readings on the other meters.[6]

2.2 Calculate how much charges pass through the:

(a) 3 Ω resistor in 30 s[2]

(b) 24 Ω resistor in 5 min [2]

2.3 Calculate the power rating of the 24 Ω resistor    [2]









3. Two parallel metal plates have a potential difference of 2000V applied across them as shown. A particle of mass 4 x 10-10 kg and carrying a charge Q = +9 x 10-9 C is placed at the positive pole and released

3.1 Sketch the electric field pattern between the plates

3.2 Explain why q will accelerate, and why the acceleration will be constant [2]

3.3 Calculate the field strength between the plates [2]

3.4 Ignoring gravitational forces, calculate the average acceleration of Q  [2]



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25 points  

QUESTION 17

Two small, identical objects, a certain distance apart, carry equal charges.The electrostatic force between them is F Newtons. If the charge on each object, as well as the distance between them is halved, the new force between them is doubled, the new force between them, in Newtons is:
a.
F
b.
4 F
c.
F/2

d.
2F

e.
None of a, b, c and d


1 points  

QUESTION 18

A bucket containing water is on a scale. An object is lowered into the water without making any contact with the bucket. The reading on the scale will:

a.
definitely increase

b.
definitely decrease

c.
definitely remain the same

d.
depend on the relative density of the object

e.
None of a, b, c and d

1 points  

QUESTION 19

Forces applied by a driver on his car's steering form a couple

True

False

2 points  

QUESTION 20

The net
of electric
produced in any process is
10 points  

QUESTION 21

A force of 10N is applied at right angles to the handle of a spanner, 0.5 m from the centre of a nut. the moment on the nut is:

a.
5 Nm

b.
2 Nm

c.
0.5 Nm

d.
15 Nm

e.
None of a, b, c and d


1 points  

QUESTION 22

A piece of copper with a mass of 0.178 g is totally immersed in ethabnol. if densities of copper and ethanol are respectively 8950 kg/m3 and 789 kg/m3. The weight of ethanol displaced is:

a.
15.8 g

b.
2.0 kg

c.
0.02 kg

d.
50 g

e.
None of a, b, c and d

1 points  

QUESTION 23

A truck loaded with sand accelerates along a highway. The driving force on the truck remains constant. What happens to the acceleration of the truck if its trailer leaks sand at a constant rate through a hole in its bottom?

a.
It decreases at a steady rate.

b.
It increases at a steady rate.

c.
It increases and then decreases.

d.
It decreases and then increases.

e.
It remains constant.

1 points  

QUESTION 24

The pressure applied to a..........................fluid increases the.....................throughout the..................by the same.......................