Tiêu đề NEET - 09 - 2024.pdf ✅

PHYSICS SECTION - A Attempt All 35 Questions (1.) The factor not needed to calculate heat lost or gained when there is no change of state is (1) Weight (2) Specific heat (3) Relative density (4) Temperature change (2.) 80gm of water at 30 C are poured on a large block of ice at 0C . The mass of ice that melts is (1) 30gm (2) 80gm (3) 1600gm (4) 150gm (3.) If the ratio of coefficient of thermal conductivity of silver and copper is 10:9 , then the ratio of the lengths upto which wax will melt in Ingen Hausz experiment will be (1) 6:10 (2) 10 :3 (3) 100:81 (4) 81:100 (4.) The volume of a metal sphere increases by 0.24% when its temperature is raised by 40 C . The coefficient of linear expansion of the metal is C (1) 5 2 10−  (2) 5 6 10−  (3) 5 2.1 10−  (4) 5 1.2 10−  (5.) Work done by the gas in the process shown in figure is (1) Positive (2) Negative (3) Zero (4) May bepositive or negative (6.) In cyclic process work done by the process is : (1) Independent of heat given to the system (2) More than the heat given to system
(3) Equal to heat given to the system (4) Zero (7.) A one mole gas expands adiabatically from a temperature T1 to a temperature T T T 2 1 2 (  ) . The work done in this process is : (1) C T T p ( 1 2 − ) (2) C T T v ( 1 2 − ) (3) R T T ( 1 2 − ) (4) Zero (8.) In an isometric process the quantity which remains constant is : (1) Total heat of the system (2) Temperature (3) Volume (4) Pressure (9.) Two different adiabatic paths for the same gas intersects two isothermals at T1 and T2 as shown int he PV diagram. Then / V V a d is equal to : (1) c b V V (2) VVc b (3) b c V V (4) c b c b VV V V+ (10.) A cyclic process is shown in the P-T diagram. Which of the following curves shows the same process on a V-T diagram.
(1) (2) (3) (4) (11.) In an isothermal change of an ideal gas, ΔU 0 = . The change in heat energy ΔQ is equal to : (1) 0.5 W (2) W (3) 1.5 W (4) 2 W (12.) A p - V diagram is obtained by changing the temperature of the gas as shown. During this process the gas is : (1) heated continuoualy (2) cooledcontinuously (3) heated in the beginning but cooled towards the end (4) Cooled in the beginning but heated towards the end (13.) In an adiabatic process, pressure is increased by 2 % 3 if 3 2 p v C C = , then the volume decrease by about: (1) 4 % 9 (2) 2 % 3