Physics question and answers for March 02, 2024
- Q What is the minimum volume of water at a temperature of 40 oC that is necessary to completely melt a 1 kg block of ice that has a temperature of...
- Q A black body with initial temperature of 300 C is allowed to cool inside an evacuated enclosure surrounded by melting ice at the rate of 0 35 C s If...
- Q 45 Two bodies A and B of equal masses area and emissivity cooling under Newton s law of cooling from same temperature are represented by the graph If 0 is...
- Q Q14 A composite bar made up of aluminium and steel is rigidly attached to the end supports at 60 C as shown in figure Find the stresses in the two...
- Q A cyclic process for 1 mole of an ideal gas is shown in figure in the V T diagram The work done in AB BC and CA respectively Question Type...
- Q A composite slab is prepared by a pasting two plates of thickness L 2 m and L 1 m and the thermal conductivities k and k The slabs have equal...
- Q A planet is at a distance r from the sun and its surfac temperature is constant at T Assuming that the plane receives energy only from the sun and loses...
- Q Two ends of a conducting rod of varying cross sections are maintained at 200 C and 0 C respectively In steady state B CD 0 C 200 C 1 temperature...
- Q A wire of length 1 m and radius 10 3 m is carrying a heavy current and is assumed to radiate as a black body At equilibrium its temperature is...
- Q 1 22 C 3 25 C 2 26 C 4 32 C Air outside a water lake is blowing at 40 C It takes 10 hours for first two centimeter...
- Q 5 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...
- Q A rod 1 m long and made of material of thermal conductivity 420 W m K has one of its ends in melting ice and the other end in boiling...
- Q Consider two hot bodies B and B2 which have temperature 70 C and 60 C respectively at time t 0 The temperature of the surrounding is 40 C The ratio...
- Q Three rods of same material same area of cross section but different lengths 10 cm 20 cm and 30 cm are connected at a point as shown What is temperature...
- Q 3 A cube and a sphere made of same material shown in figure are allowed to cool under identical conditions then 10 cm 10 cm 1 Cube will cool at...
- Q Two different metal slabs of identical length are joined in parallel Their cross sectional areas are A and 24 If their thermal conductivity coefficients are k and k as shown...
- Q 3 Heat energy at constant rate is given to two substances P and Q If variation of temperature 7 of substances with time t is as shown in figure then...
- Q 2 60 C 4 20 C 1 80 C 3 40 C 19 A cup of tea cools from 80 C to 79 9 C in 5 minute If temperature...
- Q 19 Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm The rate of heating is constant Which one of the following graphs represents...
- Q Heat flows radially outward through a spherical shell of outside radius R and inner radius R The temperature of inner surface is and that outer is At what radial distance...
- Q 28 Two coaxial cylinders of radius r and 3r are made of material of thermal conductivity K and K respectively The equivalent thermal conductivity of substance for axial heat flow...
- Q Coefficient of thermal conductivity for three metals A B and C are such that K K K If same quantity of heat flow rate per unit area is obtained from...
- Q Illustration 20 An ice box is built of wood 1 75 cm thick lined inside with cork 3 cm thick If the temperature of the inner surface of the cork...
- Q Illustration 21 Find the time in which a layer of ice 3 cm thick on the surface of a pond will increase its thicness by 1mm when the surrounding air...
- Q A spherical black body with a radius of 12 cm radiates 450 W power at 500 K If the radius were halved and the temperature doubled the power radiated in...
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