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. When the junctions of two dissimilar metals are maintained at different temperatures an electromotive force is is set up in the circuit of which these junctions are a part. A pair of junctions of this kind is known as _____________

A. thermocouple

B. thermistor

C. pyrometer

D. resistance thermometer

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2. What is common to the variation in the range and the height of a projectile?

A. vertical velocity

B. horizontal velocity

C. horizontal acceleration

D. time of flight vertical velocity, horizontal acceleration

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3. The frictional force in fluids is known as ___________

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4. The molecules of a liquid are held together by what type of forces?

A. adhesive forces

B. cohesive forces

C. surface tension forces

D. viscosity

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5. A ball is kicked and flies from point P to Q following a parabolic path in which the highest point reached is T. The acceleration of the ball is _______

A. greatest at T and Q

B. zero at T

C. greatest at P

D. the same at P as at Q and T

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6. 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. ${-}9$

B. 6

C. ${-6}$

D. 9

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

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8. 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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9. 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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10. 3-vectors are only properly represented in a 3-dimensional _____.

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11. Which of the following is NOT an effect of heat on a substance?

A. expansion

B. change of state

C. temperature change

D. convection

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12. 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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13. The _________ is an aggregate of point masses such as that the relative separation between any two points remains invariant

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14. An ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20^{o} C?

A. 34.54mm

B. 66.64mm

C. 43.84mm

D. 219.20mm

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15. A wire of cross-sectional area of $6times10{-5}m^{2}$ and length 50cm stretches by 0.2mm under a load of 3000N. Calculate the Young’s modulus for the wire

A. $5\times10^{11}Nm^{-2}$

B. $$8\times{10^{10}}Nm^{-2}$$

C. $1.25\times10^{11}Nm^{-2}$

D. $2.5\times10^{11}Nm^{-2}$

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

A. increases uniformly with respect to time

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

C. is zero

D. is constant but not zero

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

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18. 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. 25.0 and 43.3

B. 50.0 and 25.0

C. 100.0 and 25.0

D. 100.0 and 43.5

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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. centripetal force

C. inertia

D. moment

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20. A body hangs from a spring balance supported from the roof of an elavator. If the elavator has an upward acceleration of $3ms^{-2}$ and the balance reads 50 N, what is the true weight of the body?

A. 50.0 N

B. 39.8 N

C. 28.3 N

D. 38.3 N

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

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22. The rise in the level of a liquid in a tube is h. If half the amount is poured outside, what will be the new rise in the liquid level?

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

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24. 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. 30 m below the top of the building

B. 15 m above the top of the building

C. 15 m below the top of the building

D. 30 m above the building

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

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

A. the floating of a plastic sphere in water

B. the floating of a boat in water

C. the floating of a ballon in air

D. the floating of a steel wire in water

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27. A man leaves the garrage in his house and drives to a neighbouring town which is twenty kilometres away from his house on sight-seeing. He returns home to his garrage two hours after. What is his average velocity from home in km/h?

A. 0

B. 10

C. 40

D. 20

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28. The mechanism of heat transfer from one point to another through vibration of the molecules of the medium is called -------------

A. conduction

B. radiation

C. diffusion

D. convection

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29. 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. 174.5 cm/s

B. 185.2 cm/s

C. 215.3 cm/s

D. 143.7 cm/s

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

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31. The trajectory of a projectile is ________

A. an ellipse

B. a straight line

C. a circle

D. a parabola

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

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

A. palm oil

B. Water

C. kerosine

D. alcohol

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34. __________forces meet at one point and have their lines of action in different planes.

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

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

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

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

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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37. 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. 1/2 F(L-L')

B. 1/2FL'

C. F(L-L')

D. 1/2FL

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38. 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. 110 N at $100^{o}$

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

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

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

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

A. pure ice melts at normal atmospheric pressure

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

C. pure ice becomes steam at atmospheric pressure

D. theoretically all thermal motions will cease

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41. The speed of 90 hm/hr is equal to ------------------ m/s

A. 324

B. 25

C. 150

D. 90

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42. The motion of a ball rolling down a ramp is one with ________

A. decreasing acceleration

B. constant acceleration

C. increasing acceleration

D. constant speed

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43. The method of mixtures as a means of measuring the amount of heat of a substance depends of the principle of conservation of ______

A. energy

B. charge

C. momentum

D. angular momentum

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44. 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. Pull the crate with P applied horizontally

B. Push 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 inclined at an angle above the horizontal

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

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

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48. The term that best describes the need to hold the butt of a riffle firmly against the shoulder when firing to minimise impact on the shoulder is ________

A. recoil velocity

B. pressure

C. forward acceleration

D. forward displacement

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49. The amount of heat stored in a substance depends on all of the following EXCEPT _______

A. shape of the substance

B. mass of the substance

C. change in temperature of the substance

D. nature of the substance

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50. The coefficient of limiting static friction is the ratio of the ____ to the normal force.

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