 # 2018 JAMB CBT 10th 7am PHYSICS QUESTIONS AND ANSWERS (DAY 2) Physics
1 :- the velocity ratio of an inclined plane is
CORRECT ANSWER = 1/sinQ
2 :- where must an object be placed in front of the
concave mirror so that the image will formed between the
centre of curvature and the focus
CORRECT ANSWER = beyond the centre
3 :- optical instruments do NOT employ the principle of
linear magnification in their operations rather they use
CORRECT ANSWER = angular magnification
4 :- the force of attraction between two masses m1 and m2
separated at a distance 2r is given as
CORRECT ANSWER = Gm1 m2/4r2
5 :- the condition for resonance to occur in an R-L-C
serves circuit is
CORRECT ANSWER = W0 = 1/Lc
5 :- the condition for resonance to occur in an R-L-C
serves circuit is
CORRECT ANSWER = W0 = 1/Lc
6 :- calculate the work done if a force of 10N applied at
an angle of 30 0 to the horizontal moves the body through
a distance of 0.05m
CORRECT ANSWER = 0.25 {3 J
7 :- the expression for electric potential (V) is
CORRECT ANSWER = (q / 4Er)
7 :- the expression for electric potential (V) is
CORRECT ANSWER = (q / 4Er)
8 :- a solid weighs 10.5N in air and weighs 5.5N when
immersed in a liquid of density 900kgm-3, calculate the
volume of the solid
CORRECT ANSWER = 5.56 x 10 -4 m 3
8 :- a solid weighs 10.5N in air and weighs 5.5N when
immersed in a liquid of density 900kgm-3, calculate the
volume of the solid
CORRECT ANSWER = 5.56 x 10 -4 m 3
9 :- during dispersion, colours of light
CORRECT ANSWER = travel at different speeds
10 :- cobvert 180 0F to 0C
CORRECT ANSWER = 82 0C
11 :- the bean balance is used to measure
CORRECT ANSWER = mass
12 :- the diagram above represents four identical beaker
of water with some droplet of a blue colour pigment.
Which of them will have a faster rate of diffusion?
CORRECT ANSWER = beaker IV
12 :- the diagram above represents four identical beaker
of water with some droplet of a blue colour pigment.
Which of them will have a faster rate of diffusion?
CORRECT ANSWER = beaker IV
13 :- a thick glass tumbler cracks when hot water is pour
into it because of
CORRECT ANSWER = uneven expansion
14 :- the point M in the diagram above is in stable
equilibrium with
CORRECT ANSWER = minimum potention energy
15 :- the charge stored by a 5F capacitor connected to a
potential difference of 40V is
CORRECT ANSWER = 200C
16 :- the dissociation of salt solution and acids into ions is
known as
CORRECT ANSWER = electroysis
17 :- the resultant of two parallel forces acting in the
same direction applied to a block of wood will be
CORRECT ANSWER = maximum
18 :- from the above the induced e.m.f depends on
CORRECT ANSWER = I, II and III
19 :- how much current does a 120W light bulb draw
when connected to a voltage of 240?
CORRECT ANSWER = 0.5A
20 :- from the above diagram the effective resistance
between P and Q is
CORRECT ANSWER = 4.33n
21 :- a semi-conductor with rqual numver of holes and
electron is known as
CORRECT ANSWER = intrinsic semi-conductor
22 :- which of the following is CORRECT about the motion
of a simple pendulum?
CORRECT ANSWER = potention energy is maximum at the
extremes
23 :- in the vibration of stretched strings, the frequency F
and the tension T are related by
CORRECT ANSWER = f & square root T)
24 :- from the diagram above, the pressure acting on the
trapped air is
CORRECT ANSWER = H mmHg
25 :- light energy E is expressed as
CORRECT ANSWER = E = hf
26 :- the ejection of electron from the surface of a
CORRECT ANSWER = thermianic emission
27 :- where does refraction take place?
CORRECT ANSWER = at the boundary between
28 :- ten 6V cells connected in parallel will give an
effective e.m.f of
CORRECT ANSWER = 6V
29 :- vavpour is said to be saturated when
CORRECT ANSWER = in a dynamic equilibrium
30 :- a lagged calculator is suitable for measuring heat
energy because it
CORRECT ANSWER = prevents heat loss and gain
31 :- a wire carries a current of 3.0A with a magnetic
field 2.0T at an angle of 30 0. calculate the force on a
segment of wire 0.5m
CORRECT ANSWER = 1.5N
32 :- which method of heat transfer is electro-mamgnetic
in nature?
33 :- a light of 6.22eV is incident on a cadmium surface. If
a stopping voltage of 2.15eV is required to reduce the
photocurrent to zero, calculate the work function of
34 :- from the digram above, calculate F
CORRECT ANSWER = 60.00N
35 :- which of the folowing exhibits a wave motion?
CORRECT ANSWER = a plucked stretched s tring
36 :- a stone weighs W1 Newton in air W2 Newton in
water. The relative density of the stone is
CORRECT ANSWER = W1/(W1-W2)
37 :- why do pressure pots cook food faster than other
conventional pots?
CORRECT ANSWER = its higher pressure
38 :- a spring of length 0.06m is acted upon by a force of
2N creating an extension of 0.02m. What would be the
length when the applied force is increased by 8N?
CORRECT ANSWER = 0.14m
39 :- when a bar magnet is suspended freely in the earth’s
magnetic field, it will point to
CORRECT ANSWER = north – south direction
40 :- the point where a ball moving in a viscous liquid
start to move with uniform velocity is
CORRECT ANSWER = terminal velocity