PHY101

Category: PHY101

ATTENTION:

Kindly note that you will be presented with 50 questions randomized from the NOUN question bank. Make sure to take the quiz multiple times so you can get familiar with the questions and answers, as new questions are randomized in each attempt.

Good luck!

PHY101

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1. Calculate the root-mean-square velocity of oxygen molecules at room temperature, 25 oC. Given that molar mass of oxygen and molar gas constant are 31.9998 g/mol and 8.3143 J/mol K, respectively in meter per second.

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2. A 50kg boy suspends himself from a point on a rope tied horizontally between two vertical poles. The two segments of the rope are then inclined at angles 30 degrees and 60 degrees respectively to the horizontal.The tensions in the segments of the rope in newtons are ______

A. 100.0 and 43.5

B. 100.0 and 25.0

C. 25.0 and 43.3

D. 50.0 and 25.0

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3. Forces are called coplanar when all of them acting on body lie in one _____.

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4. Tin melts at 232 under standard atmospheric pressure. Express this temperature in kelvin

A. 96.19K

B. 505.15K

C. 60.91K

D. 449.16K

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5. The main condition for the rigid body is that the distance between various particles of the body does not ____.

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6. If a force of 40N acting in the direction due East and a force of 30N is acting in the direction due North. Then the magnitude of the resultant forces will be ___________.

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7. Two forces act on a point object as follows: 100 N at $170^{o}$ and 100N at $50^{o}$. Find the resultant force

A. 110 N at $50^{o}$

B. 100 N at $50^{o}$

C. 110 N at $100^{o}$

D. 100 N at $110^{o}$

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8. The heat required to raise the temperature of the body through 1K is called _______.

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9. Which of the following substances has the highest viscosity at room temperature?

A. Water

B. palm oil

C. kerosine

D. alcohol

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10. When an object is in thermal equilibrium, it is losing and gaining heat at ____ rates.

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11. An object is shot from the ground at 75m/s at an angle of 45 degrees above the horizontal. How high does the object get before beginning its descent?

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12. On what thermometric property does the working of a thermistor depend?

A. change in presure at constant volume with change in temperature

B. change in electrical resistance with change in temperature

C. change in pressure with change in temperature

D. change in volume at constant pressure with change in temperature

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13. Applied force is proportional to extension produced is a statement of ____ law.

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14. The _____of oscillations of a particle in simple harmonic motion is damped by resistive forces due to the surrounding medium.

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15. The resultant of vectors $vec{A}$ and $vec{B}$ has a magnitude of 20 units.$vec{A}$ has a magnitude of 8 units, and the angle between $vec{A}$ and $vec{B}$ is $40^{o}$. Calculate the magnitude of $vec{B}$

A. 18.4

B. 14.8

C. 16.2

D. 12.6

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16. A cart is moving horizontally along a straight line with constant speed of 30 m/s. A projectile is fired from the moving cart in such a way that it will return to the cart after the cart has moved 80 m. At what speed (relative to the cart) and at what angle (to the horizontal) must the projectile be fired?

A. 35.8 m/s at 24 degrees

B. 24 m/s at 44 degrees

C. 27 m/s at 35 degrees

D. 38.6 m/s at 54 degrees

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17. The absolute zero temperature refers to the temperature at which _____

A. pure ice becomes steam at atmospheric pressure

B. pure ice melts at normal atmospheric pressure

C. pure ice, water and water vapour at normal atmospheric pressure are in equilibrium

D. theoretically all thermal motions will cease

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18. The physical pendulum is any real pendulum in which all the mass is taken to be concentrated at a_____.

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19. Which of the following physical concepts best explains why passengers in fast moving cars should always fasten their seat-belts?

A. terminal velocity

B. inertia

C. moment

D. centripetal force

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20. What are the dimensions of power (time rate of change of expending energy)

A. $M^{2}L^{2}T^{-3}$

B. $MLT^{-2}$

C. $ML^{2}T^{-2}$

D. $ML^2T^{-3}$

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21. Gases occupy volume of the __________.

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22. Which of the following statements is not correct about reference frames?

A. Laws of physics are invariant (retain the same form) in inertial reference frames

B. In non-inertial reference frames the motion of objects depend only on the interactions of constituent particles among themselves

C. If the coordinate axes of a reference frame attached to an object remain fixed in space then the object is at rest

D. Any reference frame moving at constant velocity with respect to an inerial reference frame is also inertial

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23. A mass accelerates uniformly when the resultant force acting on it

A. is constant but not zero

B. is proportional to the displacement of the mass from a fixed point

C. is zero

D. increases uniformly with respect to time

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24. Given that the specific capacity of ice is one-half that of water, does is take more thermal energy to raise the temperature of 5 g of water or 5 g of ice by $$6^{o}C?$$

A. ice

B. Each one requires specific latent heat of a vaporization

C. water

D. It takes the same amount of thermal energy for each one

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25. Thermal expansion of a solid material depends on the following EXCEPT __________

A. the initial dimensions of the solid

B. the nature of the material making up the solid

C. average translational motion of constituent atoms of the material

D. the range of the temperature change

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26. The statement "the specific latent heat of fusion of ice is $3.3times 10^{5}$J/kg" means ______

A. $3.3\times 10^{5}$J of heat energy is required to raise the temperature if ice to melting point

B. $ 3.3\times 10^{5}$J of heat energy is required to change 1 kg of pure ice at$ 0^{o}$C to 1kg of water at $0^{o}$C

C. $ 3.3\times 10^{5}$J of heat energy is required to change any amount of pure melting ice at$ 0^{o}$C to water at the same temperature

D. $ 3.3\times 10^{5}$J of heat energy is absorbed to condense water to ice at $0^{o}$C

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27. A rope suspended from a ceiling supports an object of weight W at its opposite end. Another rope tied to the first at the middle is pulled horizontally with a force of 30N. The junction P of the ropes is in equilibrium. Calculate the weight W and the tension T in the upper part of the first rope

A. 27.2N and 39.2N

B. 16.6N and 27.3N

C. 40.5N and 62.5N

D. 30.4N and 53.7N

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28. An object is thrown upward from the edge of a tall building with a velocity of 10 m/s. Where will the object be 3 s after it is thrown? Take $g = 10ms^{-2}$

A. 15 m above the top of the building

B. 30 m below the top of the building

C. 30 m above the building

D. 15 m below the top of the building

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29. A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take $g = 10ms^{-2}$

A. 30 m/s

B. 15 m/s

C. 20 m/s

D. 10 m/s

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30. A string of natural length L extends to a new length L' under tensile force F. If Hooke’S law applies, the work done in stretching the spring is ------------

A. 1/2FL

B. 1/2 F(L-L')

C. F(L-L')

D. 1/2FL'

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31. A _______ consists of two equal and opposite parallel forces.

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32. The _______ occurs when the driving frequency is the same as the natural frequency of the oscillator.

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33. Instantaneous velocity is the velocity of a particle at some _____of its path.

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34. According to the kinetic-molecular theory, particles of matter are in motion in both gas and _____.

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35. _______ is that which enables a body to perform work.

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36. The velocity of a particle moving with simple harmonic motion is ____ at the mean position.

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37. A perfectly ____ body is defined as one which emits every wavelength with the maximum energy for each wavelength for the particular temperature of the body.

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38. When a gas is allowed to expand at constant _____the process is described as isothermal.

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39. Given three vectors $vec{a} = {-}vec{i}{-}4vec{j}+2vec{k}$, $vec{b} = 3vec{i}+2vec{j}-2vec{k}$, $vec{c} = 2vec{i}{-}3vec{j}+vec{k}$, calculate $vec{a}cdot(vec{b}timesvec{c})$

A. 6

B. 9

C. ${-6}$

D. ${-}9$

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40. How fast must a ball be rolled along the surface of a 70-cm high table so that when it rolls off the edge it will strike the floor at the same distance (70cm) from the point directly below the edge of the table?

A. 185.2 cm/s

B. 215.3 cm/s

C. 174.5 cm/s

D. 143.7 cm/s

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41. According to principle of moment, if a system of coplanar forces is in equilibrium, then the algebraic ____of their moments about any point in their plane is zero

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42. The specific latent heat of vapourization of a liquid is the quantity of heat in joules required to change 1kg mass of the liquid at its _______to gas at the same temperature.

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43. The ____ of the instantaneous centre of a moving rigid body is called centroid.

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44. Radius of _________ is the radial distance from any given axis at which the mass of a body is concentrated without changing the moment of inertia of the body about that axis.

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45. In which of the following phenomena is surface tension important?

A. the floating of a steel wire in water

B. the floating of a boat in water

C. the floating of a ballon in air

D. the floating of a plastic sphere in water

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46. A boy intends to move an m-kg crate across the floor by applying a constant force P newtons on it.The coeficient of friction between the floor and the crate is $mu$. Which of these is the best option for his task?

A. Push the crate with P inclined at an angle above the horizontal

B. Pull the crate with P inclined at an angle above the horizontal

C. Pull the crate with P inclined an angle below the horizontal

D. Pull the crate with P applied horizontally

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47. One of these is NOT a basic assumption of kinetic theory of ideal gases

A. the attraction between the molecules is negligible

B. a gas consist of a large number of molecules

C. the gas molecules are in a state of continuous random motion

D. the kinetic energy of the molecules is changing continuously

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48. FBQ25: A ________ is the turning effect caused by a couple.

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49. Which of the following contributes to the instability of an object?

A. broad base of the object

B. low potential energy

C. high centre of gravity

D. low centre of gravity

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50. The general motion of a rigid body is a combination of ________and rotation.

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