CBT physics JAMB 2017

1.Which is the incorrect formula for a body
accelerating uniformly?

2 Which of the following is not an electromagnetic
radiation?

3 Calculate the electric field intensity between two
plates of potential difference 6.5V when separated by
a distance of 35cm.

4 Why do soldiers march disorderly while crossing
a bridge?

5 Calculate the upthrust on an object of volume
50cm³ which is immersed in liquid of density
103kgm^-3 [g = 10ms^-2]

6 Under what conditions are cathode rays
produced in a discharge tube?

7 Under which of the following conditions is
workdone

8 Calculate the specific latent heat of vaporization
of steam of 1.13 x 106J pf heat energy is required to
convert 15kg of it to water.

9 A cell of internal resistance 2 π supplies current
to a 6 π resistor. The efficiency of the cell is

10 Which of the following statements is NOT
correct?

11 A block and tackle pulley arrangement has 6
pulleys in which an effort of 50N supports a load of
200N, calculate the efficiency of the machine

12 Three 3ω resistance are connected in parallel
what is the equivalent resistance?

13 Which of the following instruments helps to
maintain the correct humidity and temperature of a
building?

14 An element and its isotope only differ in the
number of

15 The thermal expansion of a solid is an advantage
in

16 The S.I unit of moment of a force is

17 A block and tackle pulley arrangement has 6
pulleys in which an effort of 50N supports a load of
200N, calculate the efficiency of the machine

18 Calculate the light of the image formed by a
pinhole camera of length 12cm used to photograph an
object 60cm away from the hole and 70cm high

19 When two objects P and Q are supplied with the
same quantity of heat, the temperature change in P is
observed to be twice that of Q. The mass of P is half
that of Q. The ratio of the specific heat capacity pf P
to Q is

20 When the r.m.s value of a source of electricity
supply is given as 240v, it means that the peak value
of the supply is

21 Which of the following operations can be used to
convert an alternative current dynamo into a direct
current dynamo

22. The net capacitance in the circuit above is

23 The instrument used to measure the pressure of a
gas is

24 A man of mass 50kg ascends a flight of stains
5m high in 5 seconds. If acceleration due to gravity is
10ms^-2 the power expended is

25 A radio station broadcast at a frequency of
600KHZ. If the speed of light in air is 3 × 108ms^-1 .Calculate the wavelength of the radio wave

26 Which of the following is a scalar quantity?

27 Determine the focal length of a thin converging
lens if the power is 5.0 dioptres

28 A string of length 5cm is extended by 0.04m
when a load of 0.8kg is suspended at the end. How
far will it extend if a force of 16N is applied? [g =
10ms^2 ]

29 How can energy loss be minimized through
Eddy-current?

30.From the diagram above, calculate the energy stored
in the capacitor

31 A constant force of %n acts for a % seconds on a
mass of 5kg initially at rest. Calculate the final
momentum

32 I. Refraction II. Interference III. Diffraction
Which of the above properties are common to all
waves?

33 I. Refraction II. Interference III. Diffraction
Which of the above properties are common to all
waves?

34 Which of the following is correct about an
electric cell?

35 Which of the following is a semiconductor

36 Which of the following surfaces will absorbs
radiant heat energy heat?

37 It is known that a neutron exists in a light atomic
nucleus
Which of the following also exists in the nucleus?

38 The instrument to measure the relative density of
light is

39 What is the speed of a body vibrating at 50
cyclic per second

40 The action of blotting paper on ink is due to

41 When two mirrors are placed at an angle of 900
to each other, how many images will be formed when
an object is placed in front of the mirrors

42 If silicon is doped with phosphorus, what type of
semiconductor material will be formed?

43 Calculate the angle of minimum deviation of a
60⁰  prism of a refractive index [sin^-1  0.75 = 49⁰]

44 What is the cost of running seven 40 W lamps
and five 80 W la mps for 12 hours of the electrical
energy cost N7.00kWk?

45. From the diagram above, calculate the total current in
the circuit

46 Calculate the time taken for a mango fruit that
fall from the tree 20 m to the ground [g = 10 ms -2 ]

47 Which of the following is not a mechanical
wave?

48 The velocity ratio of an inclined plane where
angle of inclination in θ is

49 The volume of a fixed mass of gas is 10cm³ when its pressure is 400cmHg. Determine the volume of the gas when its pressure is 200cmHg.

50 Which of the following representations is correct
for an atom X with 28 electrons and 30 neutrons?