2021 Ijmb Physics Paper 1 Questions And Answer Expo Runz

2021 Ijmb Physics Paper 1 Questions And Answer Expo Runz



2021 IJMB SOLUTION

PHYSICS ANSWER

 



INSTRUCTIONS

IJMB PHYSICS.
SECTION A QUESTIONS
3,4,5,6,7,8,9 AND 10 COMPLETED✅

SECTION B QUESTIONS
QUESTION 11 ✅

SECTION C QUESTIONS
13✅

SECTION D QUESTION
17✅



No.3

Given w = 3 revolutions
= 3 x 2π rad/s
= 6πrad/s

radius = 2m
mass = 0.5kg

Tension, T = mrw²
= 0.5 x 2 x 6π
= 18.85N



No.7

Put some lead chokes into the tube until the tube can stand upright contained in a beaker with half its length submerged in liquid. Depress the U-tube and release it. It is found that
F = -kx
And from v = w√A² – x²
w = √k/m
T = 2π/w
T = 2π√m/k
Where k is the force constant
m is the mass of the U-tube.



No.8

(8a) The specific heat capacity of a substance is the quantity of heat required to raise the temperature of a unit mass of the substance by 1°C or 1k
S.I unit – J/kg/k or Jk-¹k-¹
Dimension – L²T-²K-¹

(8b) The Young’s Modulus of a material is the ratio of the stress and strain on the material.
Y= stress/strain

Y= E/A_/e/l

S.I Unit – N/m²
Dimension – ML-¹T-²



11aii.
1. In any system of cooling objects the total momentum is always conserved provided that there is no net external force acting on the system.

OR

2. The total momentum of an isolated or closed system of colliding bodies remains constant.

OR

3. It two or more bodies collide in a closed system, the total momentum after collision is equal to the total momentum before the collision.

 



12bi) A centripetal force is a net force that acts on an object to keep it moving along a circular path. A= V²/r

12bii) H =U²Sin²@/2g => 50²(sin60)²/20
=> (2500×3/4)/20 => 7500/80
=> 93.75m

R=> U²sin2@/g => 50²Sin(2×60)/10 => (2500× _/3 /2)/10

=> (250_/3)/2 => 125_/3

 

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(17ai)

1. A progressive wave is formed due to continuous vibration of the particles of the medium.
2. The wave travels with a certain velocity.
3. There is a flow of energy in the direction of the wave.
4. No particles in the medium are at rest.
5. The amplitude of all the particles is the same.
6. Phase changes continuously from particle to particle.
Expression for it>>. \(\implies \)\(y = A \sin \frac{2\pi}{\lambda} \left(vt – x \right)\), which is the required equation for progressive plane wave

(17b) Simple harmonic motion is the motion in which the object moves to and fro along a line. … Oscillations of a pendulum are an example of simple harmonic motion.

(17c) Doppler Effect refers to the change in wave frequency during the relative motion between a wave source and its observer. … For instance, when a sound object moves towards you, the frequency of the sound waves increases, leading to a higher pitch.





 

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