Phy
1 :- a wooden block of mass 1.5kg rest on a rough hroizontal srface. If the limiting frictional force between
the block and the srface is 6N, calculate the coefficient of friction. ( g- 10ms-2)
CORRECT ANSWER =
0.4
2 :- a foster uses 5A f rom 240v, if it takes 90s to toast a loaf of bread, how much energy is consumed by
the toaster?
CORRECT ANSWER =
1.08 x 10 5 J
3 :- if an object 4cm high is placed vertically 20cm in front of a concave mirror and produces an image
80cm from the mirror, calculate the height of the image formed
CORRECT ANSWER =
16.0cm
4 :- what part of the camera corresponds to the eye?
CORRECT ANSWER =
diaphragm
5 :- the relative density of an alloy is 6.5. find the mass of the solid alloy cube of volume 0.008m3
CORRECT ANSWER =
52kg
6 :- if a load of 5N gives an extension of 0.56cm in awire, what would be the extension caused by a load of
20N when both obey Hooke’s law?
CORRECT ANSWER =
2.24cm
7 :- steel bars each of length 3.0m at 28 0C are to be used for constructing a rail line. What is the saftey gap
that msut be left between successive bars if the heightest temperature expected is 40 0C?
CORRECT ANSWER =
3.6 x 10 -4cm
8 :- how does increase in oressure affect the melting point of water?
CORRECT ANSWER =
it lowers the melting point
9 :- the work function of a metal is 4.65eV and the metal is iluminated with radiation of 6.86eV. What is
kinectic energy of the electrons ejected from the surface of the metal?
CORRECT ANSWER =
2.21eV

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PHY
1 :- what is the focus length of a mirror whose objecy and image distance from the mirror is 3cm and 15cm
respectively?
CORRECT ANSWER =
10cm
2 :- it is not advisable to rub a tent made of canvas in wet waether because it affects its
CORRECT ANSWER =
surface tension
3 :- a coil of inductance 2H is connected to a 50Hx a.c supply, the reactance of the inductor is
CORRECT ANSWER =
628n
4 :- if 4 x 1016J of enery is released in a nuclear reaction. Calculate the mass defect (c – 3.0 x 10 -8ms -1)
CORRECT ANSWER =
0.44kg
5 :- when three equal forces inlined at 120 0 on the same act on the same plane act on the object, the object
CORRECT ANSWER =
remains statioanry
6 :- the acceleration due to gravity on two bodies 50N and 80N on the earth’s suirface will be
CORRECT ANSWER =
greater on the 80N
7 :- an equiangular prism is made of florite glass refractive index of 1.414. the angle of minimum deviation
for a ray thought the glass is (sin -1 0.070 = 45 0)
CORRECT ANSWER =
45 0
8 :- caqlculate the number of moles of an object of an ideal gas of volume 8.3m3 of pressure of 3 x10 3Nm
-2 and temperature 27 0C (R = 8.3jmol -1 K -1)
CORRECT ANSWER =
10
9 :- the folowing are laws if solid friction except
CORRECT ANSWER =
friction and normal reaction
10 :-
CORRECT ANSWER =
purple
11 :- which of the following statement about a magnet is correct?
CORRECT ANSWER =
unlike poles attract each other
12 :- according to the kinetic theory, which of the following is NOT true of an increase is the temperature if
a gas at constant volume?
CORRECT ANSWER =
a decrease in pressure
13 :- calculate the energy for two capacitors 3F and 4Fg when coonected in paralle across a potential
difference of 100V
CORRECT ANSWER =
3.5 x 10 -2 s
14 :- the force required to mane a 6kg object move along a horizontal srface where the coefiicient of
friction is 0.25 is (g = 10ms -2)
CORRECT ANSWER =
15.0N
15 :- if the trun ratio of a transformer is 2.5 and the voltage across the primary is 10kV, the voltage across
the secondary is
CORRECT ANSWER =
4KV
16 :- the factor that does NOT increase the rate of evaporation of water in a pond is
CORRECT ANSWER =
the pressure of the atmoshpere
17 :- an echo sounder on a sea rece ives the echo 3s later. How far is the bed of the sea from the surface?
CORRECT ANSWER =
516.0m
18 :- the colour of sodian vapour used in flourescent tubes is
CORRECT ANSWER =
orange – red
19 :- the force between two charges 5C and 5C is 50N. Calculate the force between two charges 10C placed
at the same medium and same distance apart
CORRECT ANSWER =
200 N
20 :- which of the following statement is NOT correct for a R.I.C sreies circuit with a.c source and variable
frequency at resonace ?
CORRECT ANSWER =
impedance is maximum
21 :- leaves geneerally appear gree in the day light because they
CORRECT ANSWER =
reflect green coloyr of white light
22 :-
CORRECT ANSWER =
circle the wire
23 :- what is the quantity of heat generated when flows through a 7 resistor connected to a potential
difference of 7V for 5mins?
CORRECT ANSWER =
2100j
24 :- a body is pulled along a horizontal plane by a constant force of 15N applied parrallel to the plan.
Calculate the work done is moving the body to a distance of 10m
CORRECT ANSWER =
150J
25 :- calculate the apparent expansivity of a liquid whose increased in volume is 0.06m 3 and volume is
10m 3 if its raised through a temperature of 100 oC
CORRECT ANSWER =
5 x 10 -5 05 -1
26 :- which of the following is NOT a derived quantity?
CORRECT ANSWER =
temperature
27 :- hardness of X-rays implies
CORRECT ANSWER =
penetrating ability
28 :- which of the following is NOT a trivalent impurity atom?
CORRECT ANSWER =
arsenic
29 :- which of the following flunctions is performed by manganse (IV) oxide In the Leclanche cell?
CORRECT ANSWER =
depolarization of the cell
30 :- which of the following is both a mechanical and longititude wave?
CORRECT ANSWER =
sound
31 :- what is the quantity of heat required to the temperature of 20kg of aluminim through 10 0C (S.H.C =
900jkg -3 k-1)
CORRECT ANSWER =
18 x 10 4s
33 :- determine the focal length of a lens with power + 0.1 dioptres
CORRECT ANSWER =
10cm
34 :-
CORRECT ANSWER =
second class level
35 :- young’s modulus can be expresssed as
CORRECT ANSWER =
ration of tensile stress to strain
36 :- the sensitivity of a thermometer can be increased by
CORRECT ANSWER =
reducing the size of the bulb
37 :- a pipe closed at one end resonates to its fundemental of 300Hz. The frequency can also resonate at
CORRECT ANSWER =
900Hz
38 :- when heated, the density of oil of volume 0.8m 3 is 700kgm -3. the density when cooled to a volume
of 0.5m1is
CORRECT ANSWER =
1120.0kg/m2
39 :- which of the following sruface is the best absorber of radiant energy
CORRECT ANSWER =
black
40 :- calculate the internal resistance of two cells connected in series each of e.fm.f 1.5V connected to a n
external resistance of 12 and producing a current of 0.2A
CORRECT ANSWER =
3n