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JAMB 2021 PHYSICS likely questions and answers

JAMB 2021 PHYSICS likely questions and answers ,JAMB 2021 PHYSICS likely questions and answers ,JAMB 2021 PHYSICS likely questions and answers

Joint Admissions and Matriculations Board (JAMB) is a Nigerian entrance examination board for tertiary-level institutions. The board conducts entrance examinations for prospective undergraduates into Nigerian universities.

READ : JAMB 2021 Questions and Answers / 2021/2022 JAMB Questions and Answers

One of the reasons why students find physics very difficult is that cramming the formula alone will not help. You need to understand how the formula works and whether it is applicable to the questions asked.

All candidate need to understand that Physics requires accurate thinking and focus. For example, if a question is asked that a car starts from rest, it simply means that the initial velocity equals zero (U=0). You don’t have to be given the initial velocity in the question. Just apply the appropriate equation of motion and you are home and dry. Now when a car comes to rest, what will be equal to zero? certainly the final velocity.

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JAMB 2021 PHYSICS QUESTIONS AND ANSWERS

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?

CORRECT ANSWER = radiation

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 cadmium

CORRECT ANSWER =

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

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