PHY101

Category: PHY101

PHY101

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

1. a gas consist of a large number of molecules

2. the attraction between the molecules is negligible

3. the kinetic energy of the molecules is changing continuously

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

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

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C. One of these is an example of thermal radiation detector

1. thermometer

2. thermal glass

3. thermal rod

4. bolometer

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

1. the range of the temperature change

2. the nature of the material making up the solid

3. the initial dimensions of the solid

4. average translational motion of constituent atoms of the material

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

1. 100 N at $110^{o}$

2. 110 N at $50^{o}$

3. 100 N at $50^{o}$

4. 110 N at $100^{o}$

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

1. 25

2. 90

3. 150

4. 324

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

1. charge

2. energy

3. momentum

4. angular momentum

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I. 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

1. 16.6N and 27.3N

2. 30.4N and 53.7N

3. 27.2N and 39.2N

4. 40.5N and 62.5N

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J. A piece of stone has mass 80kg and density of 0.10 kg per meter cube. What is its volume in meter cube?

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

1. nature of the substance

2. change in temperature of the substance

3. mass of the substance

4. shape of the substance

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

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

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N. 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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O. A _______ consists of two equal and opposite parallel forces.

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

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Q. An electric kettle contains 1.5 kg of water at $$100 ^{o}$$ and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry? (Take the specific latent heat of vaporization of water as $2000kJkg^{-1}) $

1. 1000s

2. 3000s

3. 500s

4. 1500s

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

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

1. vertical velocity

2. time of flight vertical velocity, horizontal acceleration

3. horizontal velocity

4. horizontal acceleration

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

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V. 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 $$6^{o}C?$$

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

2. ice

3. Each one requires specific latent heat of a vaporization

4. water

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

1. change in electrical resistance with change in temperature

2. change in pressure with change in temperature

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

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

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

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Z. 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 _______

1. greatest at P

2. greatest at T and Q

3. zero at T

4. the same at P as at Q and T

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

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

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

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

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

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AB. 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?

1. 28.3 N

2. 50.0 N

3. 39.8 N

4. 38.3 N

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AC. 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 $vec{a}cdot(vec{b}timesvec{c})$

1. 9

2. ${-}9$

3. ${-6}$

4. 6

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AD. 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 ------------

1. 1/2FL'

2. 1/2FL

3. 1/2 F(L-L')

4. F(L-L')

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

1. pure ice becomes steam at atmospheric pressure

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

3. pure ice melts at normal atmospheric pressure

4. theoretically all thermal motions will cease

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

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AG. Which of the following is NOT true?

1. takes place at a definite temperature and pressure

2. boiling takes place only at the surface of the liquid

3. evaporation occurs only at the surface of a liquid boiling of a liquid

4. evaporation occurs at any temperature of a liquid

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AH. A wall or partition that allows free exchange of heat energy between two systems is referred to as --------------

1. adiabatic

2. isothermal

3. isobaric

4. upper fixed point and the Lower fixed point

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AI. 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 $vec{B}$

1. 14.8

2. 18.4

3. 16.2

4. 12.6

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

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AK. What is the unit of impulse?

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AL. Which of these is correct about viscosity?

1. both viscous force and upthrust act upwards

2. it varies with the relative velocity of the surfaces in contact

3. it is does not vary from one liquid to another

4. it increases with increase in temperature

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

1. terminal velocity

2. moment

3. centripetal force

4. inertia

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

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

1. increases uniformly with respect to time

2. is constant but not zero

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

4. is zero

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

1. the floating of a plastic sphere in water

2. the floating of a boat in water

3. the floating of a steel wire in water

4. the floating of a ballon in air

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

1. low centre of gravity

2. high centre of gravity

3. low potential energy

4. broad base of the object

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AR. A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true?

1. The passenger is in motion relative to the passer-by

2. Both observers are in motion relative to each other

3. The passer-by is stationary relative to the passenger

4. The passer-by is in motion relative to the passenger

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AS. The trajectory of a projectile is ________

1. an ellipse

2. a parabola

3. a straight line

4. a circle

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AT. 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 ________

1. forward displacement

2. recoil velocity

3. pressure

4. forward acceleration

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

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AV. 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 ______

1. 100.0 and 25.0

2. 50.0 and 25.0

3. 100.0 and 43.5

4. 25.0 and 43.3

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

1. adhesive forces

2. cohesive forces

3. surface tension forces

4. viscosity

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

1. decreasing acceleration

2. increasing acceleration

3. constant speed

4. constant acceleration

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AY. 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?

1. 10

2. 20

3. 40

4. 0

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

1. change of state

2. convection

3. temperature change

4. expansion

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

1. 10 m/s

2. 15 m/s

3. 30 m/s

4. 20 m/s

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BC. 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 _____________

1. thermocouple

2. resistance thermometer

3. pyrometer

4. thermistor

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BD. 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 $g = 10ms^{-2}$

1. 30 m above the building

2. 30 m below the top of the building

3. 15 m above the top of the building

4. 15 m below the top of the building

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BE. 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?

1. 219.20mm

2. 34.54mm

3. 43.84mm

4. 66.64mm

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

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BG. 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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BH. Gases occupy volume of the __________.

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

1. $ 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

2. $3.3\times 10^{5}$J of heat energy is required to raise the temperature if ice to melting point

3. $ 3.3\times 10^{5}$J of heat energy is absorbed to condense water to ice at $0^{o}$C

4. $ 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

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

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BK. Which of the following is NOT a thermometric property?

1. the pressure of a gas at constant volume

2. the electrical resistance of a conductor

3. the density of a liquid

4. the volume of a liquid

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

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BM. 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?

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

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

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

4. Pull the crate with P applied horizontally

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

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

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

2. $MLT^{-2}$

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

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

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BP. A Null vector is a vector whose magnitude is __________.

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BQ. 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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BR. 3-vectors are only properly represented in a 3-dimensional _____.

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