Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 The unit of intensity of electric field is newton/coluomb jule/coluomb volt x metre newton/metre
2 In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is 3.9 4 4.2 6
3 Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become -10 N +10 N +20 N -20 N
4 The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become 7.20 N 11.25 N 22.50 N 45.00
5 A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be 1/2 More than 1/2 Less than 1/2 Between 1 and 2
6 First law of thermodynamics is consequence of conservation of Work Energy Heat All of these
7 At what temperature the adiabatic change is equivalent to the isothermal change? Zero degree Celsius Zero Kelvin Critical temperature Above critical temperature
8 First law of thermodynamic is special case of Law of conservation of energy Charle's law Law of conservation of mass Boyle's law
9 Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure A greater than than of B A is equal to that of B A is less than that of B A is twice the pressure of B
10 Rice takes longest to cook In a submarine 100 m below the surface of the sea At sea level At Murree At Mount Everest
11 Melting point of ice Increases with increasing pressure Decreases with increasing pressure Is independent of pressure Is proportional to pressure
12 An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is -20<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 6.67<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 5<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
13 Specific heat at constant pressure is greater than the specific heat at constant volume because Heat is used up to increase temperature at constant pressure Heat is used by gas for expansions purposes at constant pressure Heat is use dup to increase internal energy The above statement is invalid
14 If water in a closed bottle is taken up to the moon and opened, the water gets Freeze Boiled Dissociated into O<sub>2</sub>and H<sub>2</sub> Evaporated
15 What temperature is the same on Celsius scale as well as on Fahrenheit scale? 32<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> -32<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> -40<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> -212<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
16 Amount of heat required to raise the temperature of a body through 1 K is called its Specific heat Water equivalent Thermal capacity Entropy
17 Good absorbers of heat are Poor emitters Non emitters Good emitters Highly polarized
18 On a cold morning a metal surface will fell colder to touch than a wooden surface, because Metal has high specific heat Metal has high thermal conductivity Metal has low specific heat Metal has low thermal conductivity
19 Heat travels through vacuum by Conduction Convection Radiation Both A and B
20 For making cooking utensils, which of the following pairs of properties is most suited? Low specific heat and high conductivity Low specific heat and low conductivity High specific heat and high conductivity High specific heat and low conductivity
21 If a liquid is heated in weightlessness, the heat is transmitted through Conduction Convection Radiation Neither, because the liquid cannot be heated in weightlessness
22 The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 10<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 17<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 20<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
23 Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is 1 : 2 2 : 3 3 : 4 8 : 9
24 The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be 2.0 x 10<sup>-5</sup>/<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 4.0x10<sup>-5</sup>/<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 6.0x10<sup>-5</sup>/<span style="font-family: arial, sans-serif; font-size: small; color: rgb(84, 84, 84);">°C</span> 2.33x10<sup>-5</sup>/<span style="font-family: arial, sans-serif; font-size: small; color: rgb(84, 84, 84);">°C</span>
25 Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be R/2 P 2P Depending on the relative mass of the gases
26 The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :
 1.7 x 10<sup>3</sup>J 10.2 x 10<sup>3</sup>J 3..4 x 10<sup>3</sup>J 6.8 x 10<sup>3</sup>J
27 At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be 81 K 355 K 627 K 627<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
28 On colliding in a closed container, the gas molecules Transfer momentum to the walls Momentum becomes zero Move in opposite directions Perform Brownian motion
29 At absolute temperature, the kinetic energy of the molecules Becomes zero Becomes maximum Becomes minimum Remain constant
30 Pressure exerted by a gas is Independent of density of the gas Inversely proportional to the density of the gas Directly proportional to the square of the density of the gas Directly proportional to the density of the gas
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