Physics question and answers for March 03, 2024
- Q 139 A black metal foil is warmed by radiation from a small sphere at temperature T and at a distance d where surrounding temperature is T It is found that...
- Q 4 The temperatures on the four surfaces of a very long square prism with dimensions w H 1 meter are given in the figure Find the temperature distribution T x...
- Q 83 If a carved black utensil is heated to high temperature and then brought in dark then 1 Both utensil and its carving will shine 2 Only carving will shine...
- Q In Newton s law of cooling k40 the dt proportionality constant k is k and k for two substances A and B having mass m and m2 area A and...
- Q s I A container with 1 kg of water in it is kept in sunlight which causes the water to get warmer than the surroundings The average energy per unit...
- Q 15 f the temperature of the sun becomes twice its present temperature then Radiated energy would be predominantly in infrared Radiated energy would be predominantly in ultraviolet Radiated energy would...
- Q Toluene liquid of volume 300 cm at 0 C is contained in a beaker and another quantiy of toluene of volume 110 cm at 100 C is in another beaker...
- Q far from the hotter end Also calculate the temperature gradient Three conducting rods of same material and cross section are shown in figure Temperature of A D and C are...
- Q 1 2 Abody cools according to Newton s Law of cooling The temperature of the body cools from 0 to 0 in time t The temperature of surrounding is 0...
- Q 33 A steel plate is 0 3 m long 0 1 m wide and 0 012 m thick The plate is placed on a heating plate of identical size maintained...
- Q We have noticed that some cooking pots have copper coating on bottom This is due to Low thermal conductivity of copper Copper retains heat than cooking pot Copper promotes distribution...
- Q 1 40cm 2 30cm 3 32cm 4 24cm 15 Steam is passed into 54g of water at 30 C till the temperature of the mixture becomes 90 C If the...
- Q A vessel contains 100 g of water The heat capacity of the vessel is equal to 10 g of water The initial temperature of water in vessel is 10 C...
- Q a 3 43 c 5 43 b 4 43 d 2 43 9 Three metal rods of the same material and identical in all respects are joined as shown in...
- Q A liquid of mass m and specific heat C is at temperature 2T Another liquid of mass and m 2 specific heat 2C is at temperature T If these two...
- Q If Qamount of heat is required to increase the temperature of one mole of a monoatomic gas at constant pressure by AT the amount of heat required to increase the...
- Q Calculate the heat transfer from inner layers of the skin to the outer layer of the skin having the thickness of 1 cm and surface area of 1 5 m...
- Q 10 A spherical planet of radius r painted black travels around the sun in a circular orbit at a distance D from its centre r D The sun a sphere...
- Q In Newton s law of cooling dt proportionality constant k is k and k for two and area m substances A and B having mass m A and A specific...
- Q 5 An ideal black body at room temperature is thrown into a furnace It is observed that 2002 2M a initially it is the darkest body and at later times...
- Q a 2 0 s b 3 0 9 Three very large plates of same area are kept parallel and close to each other They are considered as ideal black surfaces...
- Q A heat source inside a box A heat generating source S of power 36 cal sec is kept inside a thermally insulated box On two opposite walls of box there...
- Q 4 Temperature difference of 120 C is maintained between two ends of a uniform rod AB of length 2L Another bent rod PQ of same cross section as AB and...
- Q Objective Only one correct option 1 Two materials having coefficients of thermal conductivity 3K and K and thickness d and 3d respectively are joined to form a slab as shown...
- Q O A composite spherical shell is made up of two materials having thermal conductivities K and 2 k respectively as shown in the diagram The temperature at the innermost surface...
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