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Tambaya 1 Rahoto
In the figure above, what is the angle of reflection of the ray of light at mirror M?
Bayanin Amsa
Tambaya 2 Rahoto
A piano wire 0.5m long has a total mass of 0.01kg and is stretched with a tension of 800N. Calculate the frequency of the wire when it sounds its fundamental note
Bayanin Amsa
F = 12L √Tm
N:B m is mass per length
= 0.010.5
= 0.02kgm-1
F = 12×0.5 √8000.02
= 200Hz
Tambaya 3 Rahoto
Which of the following are the correct SI units of the quantities indicated? i.N(Force) II. Mn-1 (Torque) iii. watt(Power) iv. kgms-2
Bayanin Amsa
Tambaya 4 Rahoto
A tap supplies water at 25oC while another supplies water at 75oC. If a man wishes to bathe with water at 40oC, the ratio of the mass of cold water to the mass of hot water required is
Bayanin Amsa
Heat lost = heat gained
mh x c x (75 - 40) = mc x c x (40 - 25)
mhmc = 3515
= 73
Tambaya 5 Rahoto
A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?
Bayanin Amsa
Energy(kWhr) = 200 x 10-3 x 20 x 24
= 96kwhr
1 kwhr cost 5 kobo ; 96 kwhr will cost
5 x 96 = 480 kobo
Tambaya 7 Rahoto
To obtain a magnification of 2.5, how far should an object be placed from the pole of a thin converging lens of focal length 10.20m?
Bayanin Amsa
v = 2.5u
F = uvu+v
0.2 = u×2.5uu+2.5u
u = 0.28m
Tambaya 8 Rahoto
A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is
Bayanin Amsa
Efficiency = IRI(R+r) x 100
= 6I(2+6) x 100
= 75%
Tambaya 9 Rahoto
In the circuit diagram above, the ammeter reads a current of 3A when R is 5 ohms and 6A when R is 6 ohms,the value of the unknown resistance X is
Bayanin Amsa
Tambaya 10 Rahoto
A force, 10N, drags a mass 10kg on a horizontal table with an acceleration of 0.2ms. If the acceleration due to gravity is 10ms-1, the coefficient of friction between the moving mass and the table is
Bayanin Amsa
μ mg = ma
μ x 10 x 10 = 10 x 0.2
μ = 0.02
Tambaya 11 Rahoto
The product PV where P is pressure and V is volume has the same unit as
Tambaya 12 Rahoto
When taking a penalty kick, a footballer applies a force of 30.0N for a period of 0.05s. if the mass of the ball is 0.075kg, calculate the speed with which the ball moves off.
Bayanin Amsa
F = m(v−u)T
30 = 0.75(v−0)0.05
v = 20ms-1
Tambaya 13 Rahoto
The wire X in the figure above is at right angles to the plane of the paper and carries a current into the paper. at which of the points labelled 1-4, will the magnetic flux density due to this current be in the same direction as that of the horizontal component of earth's magnetic field
Bayanin Amsa
Tambaya 15 Rahoto
Which of the following ammeters may be used to measure alternating currents? i. moving-coil ammeter ii. moving-iron ammeter iii. hot-wire ammeter
Tambaya 16 Rahoto
Which of the following properties is/are common to all waves? i. Diffraction ii. Refraction iii. Interference
Tambaya 17 Rahoto
Which of the following factors affects the speed of sound in air? i. Temperature ii. pressure iii. Frequency
Bayanin Amsa
Tambaya 19 Rahoto
Which of the following phenomena explains the formation of a mirage? i. Reflection ii. Refraction iii. Diffraction
Bayanin Amsa
Tambaya 20 Rahoto
Which of the following symbolic representations is correct for an atom X with 22 electrons and 43 neutrons?
Tambaya 21 Rahoto
Bayanin Amsa
speed of driverspeeder driven = no. of teeth of driverno. of teeth of driven
120V = 2060
v = 360 rev s-1
Tambaya 22 Rahoto
Which of the following statement is TRUE of ultraviolet, visible and infra-red rays?
Bayanin Amsa
Tambaya 23 Rahoto
When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is
Bayanin Amsa
IR = 23 I(R + r)
r = 12 R
Tambaya 24 Rahoto
Two forces whose resultant is 100N, are at right angle to each other. If one of them makes an angle 30o with the resultant, determine its magnitude.
Tambaya 26 Rahoto
E, F and G are yellow, red and cyan transparent light filters respectively. The color of a white opaque object when viewed through the arrangement of the filters above is
Bayanin Amsa
Tambaya 27 Rahoto
The amount of heat needed to raise the temperature of 10kg of copper by 1k is its
Bayanin Amsa
Tambaya 28 Rahoto
When one arm of a U-tube manometer is connected to a gas supply, the levels of mercury in the two arms of the U-tube is shown in the figure above, if the atmospheric pressure is 76.0cm hg, the gas pressure is
Bayanin Amsa
Tambaya 29 Rahoto
Which of the following media allow the transmission of sound wave through them i. Air. ii. Liquids. iii. Solids.
Bayanin Amsa
Tambaya 30 Rahoto
The figure above shows displacement-time graphs for three different motions. which of the following statements is correct
Bayanin Amsa
Tambaya 31 Rahoto
An object is placed 10cm in front of a concave mirror of focal length 15cm. What is the position and nature of the image formed?
Tambaya 32 Rahoto
Two strings of the same length and under the same tension gives notes of frequencies in the ratio 4 : 1. The masses of the strings are in the corresponding
Tambaya 34 Rahoto
A particle starts from rest and moves with a constant acceleration of 0.5ms-2. The distance covered by the particle in 10s is
Bayanin Amsa
X = ut + 12 at
= (0 x 10) + (12 x 0.05 x 10 x 10)
= 25m
Tambaya 35 Rahoto
The figure above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y
Tambaya 36 Rahoto
A particle is injected perpendicularly into an electric field, it travels along a curved path as depicted in the image above,the particle is
Bayanin Amsa
Tambaya 37 Rahoto
In a certain fusion reaction, a deuteron (21H ) interacts with a triton (31He ) and produces an a-particle (42He ) and a second product. The second product is
Bayanin Amsa
21H + 31H → 42He + 10He
Tambaya 38 Rahoto
How long will it take a 60kg man to climb a height of 22m if he expended energy at a rate of 0.25kW. [g = ms-2]
Bayanin Amsa
power = mgh
0.25 x 103 = 60×10×22t
t = 52.8 sec
Tambaya 39 Rahoto
A lorry travels 10km northwards, 4km eastwards, 6km southwards, 4km westwards to arrive at a point T. What is the total displacement?
Bayanin Amsa
Tambaya 40 Rahoto
The speed of sound in air at sea-level is 340ms-1 while that of light is 300 000kms-1. How far (to the nearest meter) from the center of a thunderstorm is an observer who hears a thunder 2s after a lightening flash?
Tambaya 41 Rahoto
A body whose mass is 2kg and has a volume of 500cm just floats when completely immersed in a liquid. Calculate the density of the liquid
Bayanin Amsa
since the object floats, density of liquid = density of object
D = mv
= 2500×10
= 4.0 x 103kgm-3
Tambaya 43 Rahoto
When heat is applied to one end of a metal rod, the molecules at the other end soon begin to vibrate with greater amplitude than before because heat has been transferred by
Bayanin Amsa
Tambaya 44 Rahoto
Which of the following quantities are scalars? i. Electrical potential ii. Torque iii. Momentum iv. Kinetic energy
Bayanin Amsa
Za ka so ka ci gaba da wannan aikin?