PHY 103 EXAM CBT TEST

Ace/Undergragra March 6, 2023

4 3,542 1 minute read

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Take your time to read instructions before taking this test.

There are 40 questions which you are to answer in 15 minutes that gives you roughly 30 seconds per question.

If you can get at least 60%, you can be rest assured that you’ll ace PHY 103 exam

In a normal exam you will be asked between 40 – 60 questions but I only arranged 40 questions

Note

Do not be in a hurry to answer the questions
Do not waste time on a question you don’t know
Move as fast as possible and starting with questions that don’t have calculation first to save time
Always crosscheck
Don’t be in a hurry to submit, you are not in a competition
Don’t be scared. Getting an A is easy
Don’t be over confident, you can end up a D, E or F. Calm your blood, no be only you sabi book
Please do well to use our comment box incase there’s a message you want to pass to us

70 – 100 A

60 – 69 B

50 – 59 C

45 – 49 D

40 – 44 E

0 – 39 F

I wish you success

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Created on January 06, 2023 By

Ace/Undergragra

PHY 103

1 / 40

1. First law of thermodynamics deals with

A. Conservation of pressure

B. Conservation of energy

C. Conservation of momentum

D. Conservation of mass

2 / 40

2. _______ materials can easily be broken or cracked

A. Ductile

B. Malleable

C. Brittle

D. Compressible

3 / 40

The equation for the average kinetic energy is_________

A. 1.5KT

B. 3.2KT

C. 3.5KT

D. 0.5KT

4 / 40

4. __________ is the condition of a system at an instant of time.

A. Process

B. System

C. State

D. Thermocycle

5 / 40

5. ________ is the evidence that matter is made up of atoms and particles that are in constant vibration

A. Special relativity

B. Accelerated motion

C. Bernuolli principle

D. Brownian motion

6 / 40

6. Which of the laws of thermodynamics defines entropy

A. Zeroth

B. Third

C. First

D. Second

7 / 40

7. An object has a mass of 10kg and a length of 4m, given that the cross-sectional area of the object is 32.5m^2, Now calculate the density of the object

A. 0.077kg/m^3

B. 0.77kg/m^3

C. 0.0077kg/m^3

D. 7.077kg/m^3

8 / 40

8. __________ is a pointer for the direction of energy transfer.

A. Thermocouple

B. Temperature

C. Weight

D. Thermodynamics

9 / 40

9. A uniform cylindrical wooden block floats in water with 1/3 of its height above the water level. In a liquid of a relative density 0.8, what fraction of its height will be above the liquid

A. 1/4v

B. 1/7v

C. 1/6v

D. 1/3v

10 / 40

10. Bulk Modulus, Pressure, Force, Stress – Which one of these won't have the same unit as the others?

A. Pressure

B. Force

C. Bulk Modulus

D. Stress

11 / 40

11. __________ is a pointer for the direction of energy transfer.

A. Temperature

B. Weight

C. Thermocouple

D. Thermodynamics

12 / 40

12. Water strider can walk walk on water because

A. It is not true,

B. The surface tension of water strider is High

C. It's weight is not enough to penetrate the surface

D. The Viscosity of the water is High

13 / 40

13.

A cubic tank is completely filled with water. What will be the ratio of the hydrostatic force exerted on the base and on any one of the vertical sides?

A. 1:2

B. 2:1

C. 3:2

D. 1:1

14 / 40

14. Which of the following affects surface tension

A. Pressure

B. Impurity

C. Type of force

D. Thermodynamics

15 / 40

15. Hooke's law is applicable within what limit?

A. Ultimate strength

B. Plastic limit

C. Fracture limit

D. Elastic limit

16 / 40

16. Which of the following is true?

A. Flow is turbulent both inside and outside of the boundary layer

B. Flow is turbulent inside the boundary layer and laminar outside

C. Flow is laminar both inside and outside of the boundary layer

D. Flow is laminar inside the boundary layer and turbulent outside

17 / 40

17. Which of the following is not a basic type of stress

A. Tensile stress

B. Volumetric stress

C. Shear stress

D. Compressive stress

18 / 40

18. What is the dimension of strain

A. M/L

B. M X L X T

C. It's dimensionless

D. L x L

19 / 40

19.

A body weighs 0.3N in air, 0.25N when fully immersed in water and 0.27N when fully immersed in a liquid. Calculate its loss of weight in water

A. 1.3N

B. 0.003N

C. 0.6N

D. 0.05N

20 / 40

20. Which among the following is the formula for Gibbs free energy?

A. H-T∆S

B. H - T

C. H - T

D. T∆S

21 / 40

21. Mercury melts at ________

A. 404°C

B. 112°C

C. 0° - 4°C

D. -38.829°C

22 / 40

22. ________ Law states that provided the elastic limit of an elastic material is not exceeded, the force applied is directly proportional to the extension

A. Charles law

B. Hooke’s law

C. String law

D. Law of extension

23 / 40

23. For an isolated system

A. There is no acceleration

B. The Thermometer is always stagnant

C. Entropy

D. Neither the mass nor energy can transfer between the system and the surrounding

24 / 40

24. Gas molecules obeys Newton law

A. None

B. True

C. All

D. False

25 / 40

25. A deuterium nuclei fusion reaction will occur provided that the nuclei possesses an average kinetic energy of at least 0.72Mev what is the temperature required for nuclear fusion to take place in the deuterium?

A. 2.17 x 10^47

B. 0.772 x 10^7

C. 3 x 10^8

D. 2.07 x 10^-23

26 / 40

26. Which among the following is an assumption of Hagen-Poiseuille equation?

A. Fluid is laminar

B. Fluid is compressible

C. Fluid is turbulent

D. Fluid is uniform

27 / 40

27. A hydraulic press contains 0.25m^3 of oil find the decrease in the volume of the oil when it's subjected to a pressure increase (P' - P) = 1.6 x 10 ^7 Pa. The bulk Modulus of the oil is 5.0GigaPa

A. 0.00008

B. 0.0008

C. 0.6796

D. 0.008

28 / 40

28. The SI unit of Surface tension is ______

A. N/m

B. Nm

C. Kg/cm

D. Pa

29 / 40

29. _______ is the part of the universe, we choose to study

A. Surrounding

B. Isolated System

C. Thermodynamic cycle

D. System

30 / 40

30. A body weighs 0.3N in air, 0.25N when fully immersed in water and 0.27N when fully immersed in a liquid. Calculate its loss of weight in water

A. 1.3N

B. 0.6N

C. 0.003N

D. 0.05N

31 / 40

31. For an isolated system

A. Neither the mass nor energy can transfer between the system and the surrounding

B. There is no acceleration

C. Entropy

D. The Thermometer is always stagnant

32 / 40

32.

Which thermometer adopts pressure as its thermometric property?

A. Thermocouple

B. Constant volume gas thermometer

C. Alcohol in gas Thermometer

D. Electric Resistance

33 / 40

33. A student using a circular loop of wire and a pan of soapy water produces a bubble whose radius is 1mm. The surface tension of the soapy water is [a= 0.025N/m] determine the pressure difference between the inside and outside of the pan.

A. 100N/m

B. 1000N/m^2

C. 100N/m

D. 100N/m^2

34 / 40

34. Which of the laws of thermodynamics defines entropy

A. First

B. Third

C. Second

D. Zeroth

35 / 40

35. The pressure at any given point of a non-moving fluid is called the ____________