A man walks 1km due east and then 1km due north. His displacement is
תְשׁוּבָה
(C)
\(\sqrt 2\)km N 45oE
2
The frictional force between two bodies?
תְשׁוּבָה
(E)
has all of these characteristics
3
An air force jet flying with a speed of 335ms-1 went past an anti-aircraft gun. How far is the aircraft 5s later when the gun was fired?
תְשׁוּבָה
(D)
1675m
4
A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground? (g = 10ms-2)
תְשׁוּבָה
(E)
3s
5
A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?
תְשׁוּבָה
(C)
6 x 10-2
6
An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?
תְשׁוּבָה
(A)
The water level remains the same
7
A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms-1. The recoil speed of the machine gun is
תְשׁוּבָה
(C)
1 msec-1
8
mercury is a better barometric fluid than water because i. it needs no colouring ii. its density is many times greater than that of water iii. it does not wet glass iv. it has a high vapour pressure v. it has a high boiling point. which of the above statements are true?
תְשׁוּבָה
(B)
i, ii and iii only
9
The internationally agreed system of units(SI) for physical measurements are
תְשׁוּבָה
(C)
kg, m, sec
10
To determine the weight of an object you could
תְשׁוּבָה
(B)
use a spring balance
11
The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is
תְשׁוּבָה
(A)
\(\frac{mv^2}{r}\)
12
The density of a solid is defined as the
תְשׁוּבָה
(E)
mass per unit volume of the solid
13
A solid suspended by a piece of string is completely immersed in water. On attempting to lift the solid out of the water, the string breaks when the solid is partly out of the water. This is because
תְשׁוּבָה
(C)
the solid apparently weighs less when completely immersed in water than when partially immersed
14
The statements below were made by some students describing what happened during the determination of the melting point of solids.
i. the temperature of the solid was solid until melting started
ii. the temperature of the solid rose until melting started
iii. during melting, the temperature was rising
iv. during melting, the temperature was constant
v. the temperature continued to rise after all the solid had melted
vi. the temperature stopped rising after all the solid had melted. Which of the following gives correct statements in the right order?
תְשׁוּבָה
(A)
ii, iv, and v
15
A few grains of table salt were put in a cup of water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. The action is due to
תְשׁוּבָה
(D)
diffusion
16
A temperature 20°C is the same as
תְשׁוּבָה
(B)
68oF
17
The latent heat of fusion of ice is 80cal g-1. How much heat is required to change 10g of ice at QoC into water at the same temperature?
תְשׁוּבָה
(D)
800 cal
18
A gas at pressure PNm\(^{-2}\) and temperature 27°C is heated to 77°C at constant volume. The new pressure is
תְשׁוּבָה
(C)
1.16 PN-m-2
19
The following are some units i. Ns ii. Mm iii. Nm\(^-2\) iv. JKg\(^-1\). What are the units of latent heat?
תְשׁוּבָה
(D)
iv
20
The heat from the sun reaches the earth by the process
תְשׁוּבָה
(E)
radiation
21
Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is
תְשׁוּבָה
(A)
less than R1
22
Three 5 ohms resistors connected in parallel have a potential difference of 60v. applied across the combination. The current in each resistor is
תְשׁוּבָה
(C)
12A
23
If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?
תְשׁוּבָה
(A)
24k
24
A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on
תְשׁוּבָה
(D)
all of the above
25
In order to convert a galvanometer into an ammeter
תְשׁוּבָה
(A)
a low resistance shunt is connected in parallel
26
In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is
תְשׁוּבָה
(E)
infinite
27
On an a.c generator, which of the following does not apply?
תְשׁוּבָה
(B)
commutator
28
Why is it impossible for the lines of force of an electric field to cross one another?
תְשׁוּבָה
(D)
a positively charged particle can travel in only one direction at any time
29
A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is
תְשׁוּבָה
(E)
6000J
30
The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by
תְשׁוּבָה
(E)
transformers
31
Every house supplied with electricity is provided with a box of fuses so that
תְשׁוּבָה
(C)
the total current drawn from the mains can be limited
32
An electric charge could be transmitted through
תְשׁוּבָה
(D)
The human body, water and metals
33
a guitar string is 75cm long. the wavelength of its fundamental note is
תְשׁוּבָה
(B)
150cm
34
The boys are communicating with each other by stretching a string passing through a hole punched in the bottom of each of two tin cans. The physical principle employed is that sound travels
תְשׁוּבָה
(D)
with greater ease through a string than in air
35
A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?
תְשׁוּבָה
(C)
340ms-1
36
an object 1cm high placed on the axis 15cm from a converging lens forms an image 30cm from the lens. The size of the image is
תְשׁוּבָה
(E)
2cm
37
The visible part of light consists of the following colours
תְשׁוּבָה
(B)
red, green, blue, violet, indigo, orange and yellow
38
An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror, the number of images formed is
תְשׁוּבָה
(C)
3
39
The angular dispersion of a prism depends on
תְשׁוּבָה
(A)
the index of refraction only
40
Which of the following is true for the image formed by a convex mirror? i. the image is always virtual ii. the image is always erect iii. the image lies between pole and focus iv. the image is never magnified v. the focus length is negative
תְשׁוּבָה
(E)
all five
41
The angular dispersion of a prism depends on
תְשׁוּבָה
(B)
the angle of incidence as well as the index of refraction
42
A string is sustaining a stationary wave when
תְשׁוּבָה
(C)
two equal waves are travelling in opposite directions
43
For the correction of myopic defects in the human eye we require
תְשׁוּבָה
(B)
a concave lens
44
Of the following which is different from the other?
תְשׁוּבָה
(C)
cathode rays
45
The net charge on the atom is zero because
תְשׁוּבָה
(B)
the total charge on the electrons is equal to the total charge on the protons
