Category: PHY101 0 PHY101 1 / 50 Forces are called coplanar when all of them acting on body lie in one _____. Check 2 / 50 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 Check 3 / 50 The _____of oscillations of a particle in simple harmonic motion is damped by resistive forces due to the surrounding medium. Check 4 / 50 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 Youngâ€™s modulus for the wire $$8\times{10^{10}}Nm^{-2}$$ $5\times10^{11}Nm^{-2}$ $2.5\times10^{11}Nm^{-2}$ $1.25\times10^{11}Nm^{-2}$ 5 / 50 Gases occupy volume of the __________. Check 6 / 50 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 $g = 10ms^{-2}$ 30 m above the building 15 m below the top of the building 30 m below the top of the building 15 m above the top of the building 7 / 50 According to the kinetic-molecular theory, particles of matter are in motion in both gas and _____. Check 8 / 50 Â 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 30.4N and 53.7N 27.2N and 39.2N 40.5N and 62.5N 16.6N and 27.3N 9 / 50 Â In which of the following phenomena is surface tension important? the floating of a plastic sphere in water the floating of a boat in water the floating of a ballon in air the floating of a steel wire in water 10 / 50 3-vectors are only properly representedÂ in a 3-dimensional _____. Check 11 / 50 One of these is an example of thermal radiation detector thermal rod thermometer thermal glass bolometer 12 / 50 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? Check 13 / 50 Â 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 _______ greatest at T and Q zero at T the same at P as at Q and T greatest at P 14 / 50 What is common to the variation in the range and the height of a projectile? horizontal velocity time of flight vertical velocity, horizontal acceleration horizontal acceleration vertical velocity 15 / 50 Â The molecules of a liquid are held together by what type of forces? cohesive forces adhesive forces viscosity surface tension forces 16 / 50 The main condition for the rigid body is that the distance between various particles of the body does not ____. Check 17 / 50 The physical pendulum is any real pendulum in which all the mass is taken to be concentrated at a_____. Check 18 / 50 Thermal expansion of a solid material depends on the following EXCEPT __________ the initial dimensions of the solid the nature of the material making up the solid average translational motion of constituent atoms of the material the range of the temperature change 19 / 50 Â Which of the following statements is not correct about reference frames? Laws of physics are invariant (retain the same form) in inertial reference frames If the coordinate axes of a reference frame attached to an object remain fixed in space then the object is at rest Any reference frame moving at constant velocity with respect to an inerial reference frame is also inertial In non-inertial reference frames the motion of objects depend only on the interactions of constituent particles among themselves 20 / 50 Â 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? 38.3 N 28.3 N 39.8 N 50.0 N 21 / 50 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. Check 22 / 50 One of these is NOT a basic assumption of kinetic theory of ideal gases the gas molecules are in a state of continuous random motion a gas consist of a large number of molecules the attraction between the molecules is negligible the kinetic energy of the molecules is changing continuously 23 / 50 The mechanism of heat transfer from one point to another through vibration of the molecules of the medium is called ------------- radiation convection diffusion conduction 24 / 50 The _________ is an aggregate of point masses such as that the relative separation between any two points remains invariant Check 25 / 50 Applied force is proportional to extension produced is a statement of ____ law. Check 26 / 50 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? The passer-by is in motion relative to the passenger Both observers are in motion relative to each other The passenger is in motion relative to the passer-by The passer-by is stationary relative to the passenger 27 / 50 Â 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? 38.6 m/s at 54 degrees 24 m/s at 44 degrees 35.8 m/s at 24 degrees 27 m/s at 35 degrees 28 / 50 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 $$6^{o}C?$$ It takes the same amount of thermal energy for each one water Each one requires specific latent heat of a vaporization ice 29 / 50 The heat required to raise the temperature of the body through 1K is called _______. Check 30 / 50 Â The motion of a ball rolling down a ramp is one with ________ constant speed increasing acceleration decreasing acceleration constant acceleration 31 / 50 __________forces meet at one point and have their lines of action in different planes. Check 32 / 50 On what thermometric property does the working of a thermistor depend? change in pressure with change in temperature change in presure at constant volume with change in temperature change in volume at constant pressure with change in temperature change in electrical resistance with change in temperature 33 / 50 Instantaneous velocity is the velocity of a particle at some _____of its path. Check 34 / 50 Which of the following physical concepts best explains why passengers in fast moving cars should always fasten their seat-belts? terminal velocity centripetal force inertia moment 35 / 50 Â Which of the following is NOT an effect of heat on a substance? expansion temperature change convection change of state 36 / 50 Â Tin melts at 232 under standard atmospheric pressure. Express this temperature in kelvin 60.91K 505.15K 96.19K 449.16K 37 / 50 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. Check 38 / 50 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. Check 39 / 50 Â A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take $g = 10ms^{-2}$ 10 m/s 15 m/s 30 m/s 20 m/s 40 / 50 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 $vec{a}cdot(vec{b}timesvec{c})$ 9 6 ${-6}$ ${-}9$ 41 / 50 The fundamental interval of a thermometric scale is ______ above the upper fixed point the temperature scale below the upper fixed point the difference between the upper and the lower fixed points 42 / 50 Â Which of the following is NOT true? evaporation occurs at any temperature of a liquid boiling takes place only at the surface of the liquid takes place at a definite temperature and pressure evaporation occurs only at the surface of a liquid boiling of a liquid 43 / 50 Â A string of natural length L extends to a new length L' under tensile force F. If Hookeâ€™S law applies, the work done in stretching the spring is ------------ 1/2 F(L-L') F(L-L') 1/2FL' 1/2FL 44 / 50 The coefficient of limiting static friction is the ratio of the ____ to the normal force. Check 45 / 50 A mass accelerates uniformly when the resultant force acting on it is proportional to the displacement of the mass from a fixed point is constant but not zero is zero increases uniformly with respect to time 46 / 50 Â The trajectory of a projectile is ________ a straight line a parabola a circle an ellipse 47 / 50 Â 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? Pull the crate with P applied horizontally Push the crate with P inclined at an angle above the horizontal Pull the crate with P inclined at an angle above the horizontal Pull the crate with P inclined an angle below the horizontal 48 / 50 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. Check 49 / 50 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 _____________ pyrometer resistance thermometer thermocouple thermistor 50 / 50 When an object is in thermal equilibrium, it is losing and gaining heat at ____ rates. Check Restart quiz Rate this quiz Send feedback