Properties of matter Questions and Answers

The temperature coefficient of resistance of a conductor is 0 0025 C At 200 K its resistance is 2 The resistance of the conductor will be 8 Q at temperature about 1 400 K 3 600 K 2 4 OS 300 K 800 K

During blood transfusion the needle is inserted in a vein where the gauge pressure is 2000 Pa At what height must the blood container be placed so that blood may just enter the vein Density of blood 1 06 10 kg m and g 9 8 m s 0 192 m 0 182 m 0 172 m 0 152 m

9 Water flows steadily through a horizontal pipe of variable cross section If the pressure of water is p at a point where flow speed is v the pressure at another point where the flow of speed is 2v is take density of water as p 3pv 2 a p 3pv b p dn pv 2 07

A copper wire and a steel wire of the same diameter and length are connected end to end and a force is applied which stretches their combined length by 1 cm The two wires will have Question Type Single Correct Type 1 2 3 Different stresses and strains The same stress and strain The same strain but different stresses 4 The same stress but different strains

at e f of A cubical block of wood of edge 3 cm floats in water The lower surface of the cube just touches the free end of a vertical spring fixed at the bottom of the pot see figure 7 111 Find the maximum weight that can be put on the block without wetting it Density of wood 800 kg m and spring constant of the spring 50 N m Take g 10 m s ellllllllll

Internal energy of n moles of hydrogen at temperature T is equal to internal energy of n moles of Helium at temperature 2T The ratio n n is Answer A B C Your Attempt 35 2 3 3 65 Correct answer Rate th

The freezing point of pure benzene is 5 40 C and that of solution containing 2 0 gm of solute per 100 gm of benzene is 4 40 C Calculate the molecular of solute Molal depression constant is 5 C m O 10 O 1000 O 100 O 72 2 F

vertical wires 1 2 ane 3 are a rod of mass Min as the figure The wires are of equal length and equal cross sectional area It is given that Y The wires 1 and 3 are attached at the extreme ends of the rod Choose the correct option s a T 27 b 27 7 12 M c T T

Three identical balls of rubber aluminum and steel are dropped from the same height on a horizontal rigid surface If Vrubber VA1 and V steel are their speeds just after the collision then VAI 1 Vrubber 2 Vrubber VA1 V steel Vsteel 3 Vrubber Val Vsteel 4 Vrubber Vai V steel 1 23 2 21 1 1 A 3 53 1 4 5

A crystal has a coefficient of expansion 13 10 7 in one direction and 231 x 10 7 in every direction at right angles to it Then the cubical coefficient of expansion is a 462 10 7 c 475 x 10 7 b d 244 10 7 257 10 7

A soap film is formed on a vertical equilateral triangular frame ABC Side BC can move vertically always remaining horizontal If m is the mass of rod BC and T is surface tension of soap film Mark the correct statement s LEAT B C The length of BC in equilibrium is The length of BC in equilibrium is mg 2T mg T B 3m The time period of small oscillations about the equilibrium position is T The time period of small oscillations about the equilibrium position is m 3T

A perfect reversed heat engine is used for making ice at 5 C from water available at 25 C The temperature of freezing mixture is 10 C Calculate quantity of ice formed per kWhr For ice specific heat is 2 1 kJ KgK and latent heat is 335 kJ Kg

26 If p is the density of the material of a wire and othe breaking stress The greatest length of the wire that can hang freely without breaking is 20 pg a 27 If 1 b P og c Pg 20 d a pg

A steel wire whose length is 130 cm and whose cross section area is 9 50 x 10 7 m is heated to an average temperature of 830 C and stretched tout between two rigid supports What tension is develope in wire when it is cooled to 20 C Y 2 x 1011 N m a 11 x 10 6 C 1200 N 1700 N 2100 N M

A 0 70 kg metal dish contains 1 kg of water at 20 C A 0 5 kg iron bar at 120 C is dropped into the water and the final temperature is 24 9 C What is the material of the dish Write your answer in CAPITAL LETTERS Ciron 11 koal kg C Cuater 1 koal kg C

2 Draw a complete shearing force and a bending moment diagram for the for the beam shown in the figure Show detailed calculations Use the last two digits of your ID number for the missing force F kN F KN 2 m B 10 kN m 10 m C