Physics question and answers for March 09, 2024
- Q The pressure at the bottom of a water tank is 4P where P is atmospheric pressure If water is drawn out till the water level decreases by 3 5th then...
- Q Two lines AC and BC are drawn on a circular disc as shown in figure The disc is made of a material with linear expansion coefficients a a Here a...
- Q Two rods of material X sandwich another rod of material Y as shown in Figure Rivet X Y X Rivet L At temperature T the three rods are in a...
- Q 3 Two identical uniform rods A and B are of equal length L and have same temperature The cross are square with edge length a Rod A is kept over...
- Q A sphere of diameter 7 cm and mass 266 5 g floats in a both of liquid As the temperature is raised the sphere just sinks at a temperature of...
- Q Q 1 6 kJ The value of adiabatic exponent A metal ball of mass m is heated by means of a 18 watt heater in a room at 20 C...
- Q Q 101 A vessel is filled with a gas at one Q 101 atmospheric pressure At the same temperature the mass of that gas is increased by 25 the pressure...
- Q The temperature of a wire of length 1 metre and area of cross section rod is not allowed to increase in length the force required will be A 10 N...
- Q Fig 9 15 mild steel wire of length 1 0 m and cross sectional area 0 50 x 10 cm stretched well within its elastic limit horizontally between two pillars...
- Q A Carnot engine has an efficiency of 20 When temperature of sink is reduced by 80 C its efficiency is doubled The temperature of source is NCERT Pg 313 me...
- Q A U tube has a liquid at 0 C and 100 C in the two limbs The heights of the liquid colum are 20 cm and 22 cm respectively The...
- Q 1 A body cools from 80 C to 70 C in 12 minutes and from 70 C to 60 C in time t The value of t is temperature of...
- Q The lengths of an iron and a zinc rod at 0 C are 25 55 cm an 25 5 cm respectively At what temperature will their lengths equal Coefficients of...
- Q 41 Compressed air is contained in a cylinder at room temperature It suddenly start leaking through a hole Which of the following correctly describes the behaviour of the gas coming...
- Q How much heat energy must be added to a 7 6 cm diameter copper sphere to raise its temperature from 50 C to 130 C Express your answer with the...
- Q When placed in air at 30 C the temperature of a body decreases from 60 C to 50 C in ten minutes After next ten minutes its temperature will be...
- Q Which one of the following statements is wrong 1 Young s modulus for a perfectly rigid body is zero 2 Bulk modulus is relevant for solids liquids and gases 3...
- Q In a thermodynamical process pressure of fixed mass of gas is changed in such a way that the gas molecules give out 30 J of heat and 10 J of...
- Q The coefficient of linear expansion of crystal in one direction is a and that in every direction perpendicular to it a2 The coefficient of cubical expansion is Question Type Single...
- Q is attached to one end of a massless string length the other end of which is attached to a fixed support O The mass swings around in a vertical circle...
- Q The work done in blowing a soap bubble of radius R is W at room temperature Now the soap solution is heated From the heated solution another soap bubbl of...
- Q C4 If two rods of length L and 2L having coefficient 24 of linear expansion a and 2a respectively are connected end to end The average coefficient of linear expansion...
- Q The speed of a transverse wave going on a uniform wire having length of 50 cm and mass 5 0 gram is 120 m s The area of cross section...
- Q 19 33 A monoatomic ideal gas initially at temperature T is enclosed in a cylinder fitted with a frictionless piston The gas is allowed to expand adiabatically to a temperature...
- Q The temperature of a liquid in a Toricelli barometer with large base vessel slightly changes by AT and the atmosphere pressure remains constant at that place The height h of...
- Q Qc Variation of radiant energy emitted by sun filament of tungsten lamp and welding are as a function of its wavelength is shown in figure Which of the following option...
- Q A composite metal bar of uniform section is made up of length 25 cm of copper 10 cm of nickel and 15 cm of aluminium Each part being in perfect...
- Q 14 The temperature co efficient of resistance of a wire 21 1 at 0 C is 0 00125 C 1 At 25 C its resistance is one ohm The resistance...
- Q The coefficient of apparent expansion of a liquid when determined using two different vessels A and B are y and Y2 respectively If the coefficient of linear expansion of the...
- Q When the temperature of a rod increases from t to t AT its moment of intertia increases from I to 1 Al If a be the coefficient of linear expansion...
- Q A blacksmith fixes iron ring on the rim of the wooden wheel of a bullock cart The diameter of the rim and the rion ring are 5 243 m and...
- Q Two spheres of the same material have the same radius but one is hollow while the other is solid Both spheres are heated by same temperature Then D The solid...
- Q Q 3 What effect the following changes will makes to the range sensitivity and responsiveness of a mercury in glass thermometer a Increase in size of the bulb b Increase...
- Q Q 1 In a temperature scale X ice point of water is assigned a value of 20 X and the boiling point of water is assigned a value of 220...
- Q S T very long conduit of inner circular cros thermal conductivity of 1 W m K passes a hot fluid which maintains the inner surface at T 50 C The...
- Q The work done by battery to transfer a 32 charge of 8 10 18 C on a condenser of capacity 100 micro farad is 1 16 10 2 J 2...
- Q 2 Liquid oxygen at 60K is heated to 300 K at constant pressure of 1atm The rate of heating is constant Which of the following graphs represent the variation of...
- Q 6 On heating a liquid of coefficient of cubical expansion y in a container having co efficient of Y 2 linear expansion the level of liquid in the container will...
- Q An arrangement consisting of slabs is shown in the figure When system is placed in situation a with temperature difference is maintained between 1 2 equivalent thermal conductivity of system...
- Q 1 The pressure of a medium is changed from 1 01 x 105 Pa to 1 165 105 Pa and change in volume is 10 keeping temperature constant The bulk...
- Q 1 A solid sphere of radius R acquires a terminal velocity v when falling due to gravity through a viscous fluid having a coefficient of viscosityn The sphere is broken...
- Q 4 40 C 19 A P V diagram for a thermodynamic process is shown in the figure If T T then choose the correct option during the process PA 1...
- Q 3 Evaporation 4 All of these 8 Volume versus temperature graph of two mole of helium gas is as shown in figure The ratio of change in internal energy and...
- Q If the cost of energy is 0 24 per Kwh how much would it cost to heat a pool of length 12 metres width 9 metres depth 1 5 metres...
- Q 42 Hot water at 50 C is routed from one building in which it is generated to an adjoining uilding in which it is used for space heating Transfer between...
- Q 7 An anisotropic material has coefficient of linear thermal expansion a a2 and a3 along x y and z axis respectively Coefficient of cubical expansion of its material will be...
- Q Test 4 Code A 29 When the temperature of a rod increases from T to T AT its moment of inertia increases from to Al If a be the coefficient...
- Q Statement 1 The temperature dependence of resistance is usually given as R R 1 ast The resistance of a wire changes from 100 2 to 150 2 when its temperature...
- Q The stress strain graph for a metallic wire is shown at four different temperature T T2 T3 and T4 then Stress T T 4 T3 C T T T3 T4...
- Q An ideal gas is at initial temperature T and pressure P If pressure changes from P to P dp when temperature changes from T to T dT at constant volume...
- Q The coefficients of linear expansion of steel and brass are 11 x 10 6 C and 19 x 10 6 C respectively If their difference in lengths at all temperatures...
- Q The reading of brass scale at room temperature is L Above room temperature reading is L and below room temperature reading is L3 then relation between the readings is A...
- Q An ideal monoatomic gas is carried around the cycle ABCDA as shown in the figure The efficiency of the gas cycle is P 3Po B Po A Vo 2Vo V...
- Q 10 k Gulab Jamuns assumed to be spherical are to be heated in an oven They are available in two sizes one twice bigger in radius than the other Pizzas...
- Q If two metallic plates of equal thicknesses and thermal conductivities K and K are put together face to face and a common plate is constructed then the equivalent thermal conductivity...
- Q 2 Assertion A Kinetic theory deals with bulk systems in terms of macroscopic quantities such as temperature internal energy entropy etc Reason R Kinetic theory and statistical mechanics interpreted these...
- Q Graphs give the temperature along an x axis that extends directly through a wall consisting of three layers with different nonzero and finite coefficient of thermal conductivities The air temperature...
- Q 10 Consider the situation shown in figure The force F is equal to the m g 2 If the area of cross section of the string is A and its...
- Q A water cooler of storage capacity 120 liters can cool water at a constant rate of P within closed circulation system as shown schematically in the figure the water from...
- Q A steel bolt of cross sectional area A 5 x 105 m is passed through a cylindrical tube made of aluminium Cross sectional area of the tube material is A...
- Q Q4 An ideal gas expands isothermally from a volume V to V and then compressed to original volume V adiabatically Initial pressure is p and final pressure is p3 The...
- Q Two resistors of resistance Rand 3R have thermal coefficients of resistance a and 2a respectively Equivalent thermal coefficient of resistance for the combination connected in parallel is O O 5...
- Q Two non mixing liquids of densities p and no n 1 are put in a container The height of each liquid is h A solid cylinder of length L and...
- Q A light wire of length L area of cross section A is hanging from fixed support If a mass M is suspended from its free end then strain produced in...
- Q 3 Q 15 If the length of a cylinder on heating increases by 2 the area of its base will increase by 1 0 5 3 1 long string having...
- Q A 5 liter glass vessel is filled to its brim with water The coefficient of cubical expansion of water is 1 3 10 C and coefficient of volume expansion of...
- Q Initially container was full When temperature change by AT volume of liquid volume of container V V 1 AT Vc Vo 1 Ye AT So overflow volume of liquid relative...
- Q Inner surface of a cylindrical shell of length 1 and of material of thermal conductivity k is kept at constant temperature T and outer surface of the cylinder is kept...
- Q 6 A black body at 227 C radiates heat at the rate of 7 cals cm s At a temperature of 727 C the rate of heat radiated in the...
- Q The value of coefficient of volume expansion o glycerin is 5 x 10 4K 1 The fractional change in the density of glycerin for a rise of 40 C in...
- Q aluminium sphere has a diameter of exactly 25 04 mmat it s temperature of 100 C The sphere is placed on top of the ring and two are allowed to...
- Q 3 The relative density of a metal may be found by hanging a block of the metal from a spring balance and nothing that in air the balance reads 5...
- Q clamped rigidly at its ends at temperature to when the temperature t is increased the expanding bar will bow out as shown above If the bowing is not too large...
- Q A certain gas is taken to the five states represented by dots in the graph The plotted lines are isotherms Order of the most probable speed V of the molecules...
- Q A tapered circular bar of length is rigidly fixed at both the ends Diameter of bar at one end is D and other end is d The temperature of the...
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