JAMB - Physics (1994)

• 1

  If it takes 5.0 hrs to drain a container of 540.0cm³ of water, what is the flow rate of water from the container in kg^-1? [Density of water = 1000kgm^-3]

  回答

  (D)

  30.0kg^-1 s
• 2

  A boat travels due east at a speed 40ms^-1s across a river flow due south at 30ms^-1s. What is the resultant speed of the boat?

  回答

  (C)

  50.0ms^-1
• 3

  An object is projected with a velocity of 80ms^-1 at an angle of 30^o to the horizontal.The maximum height reached is

  回答

  (B)

  80m
• 4

  A motor vehicle is brought to rest from a speed of 15ms^-1 in 20 seconds. Calculate the retardation.

  回答

  (A)

  0.75ms^-1
• 5

  Which of the following is TRUE of a particle moving in a horizontal circle with constant angular velocity?

  回答

  (C)

  both energy and linear momentum are constant
• 6

  An object of mass 50kg is released from a height of 2m.Find the kinetic energy just before it strikes the ground

  回答

  (B)

  1000J
• 7

  A cone in an unstable equilibrium has its potential energy

  回答

  (B)

  increased
• 8

  Calculate the magnitude of the force required to just move a 20kg object along a horizontal surface if the coefficient of friction is 0.2. [g = 10ms^-2]

  回答

  (B)

  40.0N
• 9

  Calculate the velocity ratio of a screw jack of pitch 0.3cm if the length of the tommy bar is 21cm

  回答

  (D)

  140\(\pi\)
• 10

  A force of 15N stretches a spring to a total length of 30cm. An additional force of 10N stretches the spring 5cm further. Find the natural length of the spring

  回答

  (B)

  22.5cm
• 11

  Which of these statements are TRUE of pressure in liquids? i. pressure acts equally in all direction. ii. pressure decreases with depth. iii. pressure at the same level of a liquid is the same. iv pressure is dependent on the cross-sectional area of the barometer tube

  回答

  (A)

  i, iii only
• 12

  The mass of a specific gravity bottle is 15.2g when it is empty. it is 24.8g when filled with kerosene and 27.2g when filled with distilled water. Calculate the relative density of kerosene

  回答

  (D)

  0.80
• 13

  If a solid X floats in liquids P of relative density 2.0 and in liquid Q of relative density 1.5, it can be inferred that the

  回答

  (A)

  weight of P displaced is greater than that of Q
• 14

  The melting point of naphthalene is 78^oC. What is this temperature in kelvin

  回答

  (B)

  351k
• 15

  A Motor Tyre is inflated to pressure of 2.0 x 10⁵Nm^-2 when the temperature of air is 27^oC. What will be the pressure in it at 87^oC assuming that the volume of the Tyre does not change?

  回答

  (B)

  2.4 x 10⁵Nm^-2
• 16

  When 100g of liquids L1 at 78°C was mixed with Xg of liquid L2 at 50°C, the final temperature was 66°C. Given that the specific heat capacity of L2is half that of L1, find x

  回答

  (C)

  150g
• 17

  Heat is supplied to a test tube containing 100g of ice at its melting point. The ice melts completely in 1 min.What is the power rating of the source of heat? [Latent heat of fusion of ice = 336Jg^-1]

  回答

  (C)

  560W
• 18

  If a room is saturated with water vapour, the temperature of the room must be

  回答

  (D)

  below or at the dew point
• 19

  Two similar kettles containing equal masses of boiling water are placed on a table. If the surface of one is highly polished and the surface of the other is covered with soot, Which of the following observations is correct

  回答

  (C)

  the kettle covered with soot cools down more quickly because it is a good radiator
• 20

  The equation of transverse wave traveling along a string is given by Y = 0.3 sin(0.5x - 50t) where Y and X are in cm and t is in seconds.Find the maximum displacement of the particles from the equilibrium position

  回答

  (D)

  0.3cm
• 21

  The sound from a source travelled to the bottom of the sea and the echo was heard 4s later. If the speed of sound in sea water is 1500ms^-1 the depth of the sea is

  回答

  (B)

  3000m
• 22

  The fundamental frequency of vibration of a sonometer wire may be halved by

  回答

  (A)

  doubling the length of the wire
• 23

  A pipe of length 45cm is closed at the end. Calculate the fundamental frequency of the sound wave generated in the pipe if the velocity of sound in air is 360ms^-1 [Neglect end correction]

  回答

  (C)

  200.0Hz
• 24

  The note produced by a stretched string has a fundamental frequency of 400Hz. If the length of the string is doubled while the tension in the string is increased by a factor of 4, the frequency is

  回答

  (B)

  400Hz
• 25

  To produce a parallel beam of light from a concave mirror, the distance at a which the lamp should be placed from the mirror is equal to

  回答

  (A)

  the focal length
• 26

  Light of frequency 6.0 x 10\(^{14}\) Hz travelling in air is transmitted through glass or refractive index 1.5. Calculate the frequency of the light in the glass

  回答

  (B)

  6.0 x 10¹⁴Hz
• 27

  An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?

  回答

  (B)

  10cm
• 28

  An object is placed directly below a glass block of thickness 3.0cm. Calculate the lateral displacement of the object if the refractive index of the glass is 1.5.

  回答

  (A)

  1.0cm
• 29

  In a projection lantern of focal length f, the object distance u, is such that

  回答

  (D)

  f < u < 2f
• 30

  If the Nigeria flag (green, white, green) is viewed in pure yellow light, which of the following set of colours would be observed on the flag?

  回答

  (A)

  Green, yellow, green
• 31

  Which of the following has the lowest internal resistance when new?

  回答

  (C)

  Accumulator
• 32

  When a biro pen rubbed on a dry silk cloth is moved very close to a piece of paper on a dry table, the pen is found to pick up the paper. This is because

  回答

  (D)

  both the pen and the cloth are charged
• 33

  A capacitor 8\(\mu\)F is charged to a potential difference of 100V. The energy stored by the capacitor is

  回答

  (D)

  4.0 x 10^-2J
• 34

  Two capacitors R₁ = 4\(\Omega\) and R₂ = 5\(\Omega\) are connected in parallel across a potential difference. If P₁ and P₂ represent power dissipated in R ₁ and R₂ respectively, then the ratio P₁ : P₂ is

  回答

  (B)

  5 : 4
• 35

  Which of the following are found in the receiver but not in the microphone of a telephone handset? i. Diaphragm. ii. soft iron pole pieces. iii. permanent magnet. iv.carbon blocks

  回答

  (C)

  ii and iii
• 36

  If two parallel conductors carry currents flowing in the same direction, the conducts will

  回答

  (A)

  attract each other
• 37

  A certain radioisotope of \(^{235}_{92}U\) emits four alpha particles and three beta particles. The mass number and the atomic number of the resulting elements respectively are

  回答

  (A)

  219 and 87
• 38

  If light with photon energy 2eV is incident suitably on the surface of a metal with work function 3eV, then

  回答

  (A)

  no electron will be emitted
• 39

  A spring of length 25cm is extended to 30cm by a load of 150N attached to one of its end, what is the energy stored in the spring?

  回答

  (C)

  3.75J
• 40

  

  What is the reading of the vernier calipers shown above

  回答

  (C)

  1.39cm