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 temperature of gas is produced by At potential energy of its molecules The kinetic energy of its molecules The attractive force between its molecules The repulsive force between its molecules
2 If the volume of the gas is to be increased by 4 times, then Temperature and pressure must be doubled At constant P the temperature must be increased by 4 times At constant T the pressure must be increased by four times It cannot be increased
3 A real gas can be approximated to an ideal gas at Low density High pressure High density Low temperature
4 If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then C<sub>p</sub>- C<sub>v</sub>= R C<sub>p</sub>- C<sub>v &lt; R</sub> C<sub>p</sub>- C<sub>v = 0</sub> C<sub>p</sub>- C<sub>v &gt; R</sub>
5 Triple point of water is 273.16<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°F</span> 372.16K 273.16<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°F</span> 273.16
6 Rate of diffusion is Faster in solids than in liquids and gases Faster in liquids than in solids and gases Equal to solids, liquids and gases Faster in gases than in liquids and solids
7 Pressure of a gas at constant volume is proportion to Total energy of gas Average P.E to molecules Average K.E of molecules Total internal energy of gas
8 According to kinetic theory of gases, molecules of a gas behave like Inelastic spheres Perfectly elastic rigid sphere Perfectly elastic non-rigid spheres Inelastic non-rigid spheres
9 10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct? Each have same number of molecules Don't have same number of molecules Can't be predicted None
10 An isochoric process is one which take place at Constant internal energy Constant entropy Constant volume Constant pressure
11 Brownian motion increases due to Increase in size of Brownian particle Increase in temperature of medium Increase in density of medium Increase in viscosity of medium
12 If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is 2 : 1 4 : 1 1 : 4 3 : 4
13 The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at 546 K 273 K 546<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 273<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
14 Energy gas behaves like an ideal gast at High temperature and low pressure Low temperature and high pressure Both A and B None
15 R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes 2V 3V 0.5V V
16 Maximum density of H2O is at the temperature 32<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°F</span> 39.2<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°F</span> 42<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°F</span> 4<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°F</span>
17 At O° K which of the following properties of a gas will be zero? Kinetic energy Potential energy Vibrational energy Density
18 The product of the pressure and volume of an ideal gas is A constant Approximately equal to the universal gas constant Directly proportional to its temperature Inversely proportional to its temperature
19 Boyle's law is applicable in Isochoric process Isothermal process Isobaric process Isotonic process
20 Absolute temperature can be calculated by Means squares velocity Motion of the molecule Both A and B None of these
21 Which of the following is not thermo dynamical function? Enthalpy Work done Gibb's energy Internal energy
22 At constant volume temperature is increased. Then Collision on walls will be less Number of collisions per unit time will increase Collision will be in straight lines Collision will not change
23 The number of translation degress of freedom for a diatomic gas is 2 3 5 6
24 Fidelity refers to Reproduction of original sound Reproduction of original image Reproduction of music Reproduction of a CD from original copy
25 The loudness and pitch of a sound note depends on Intensity and velocity Frequency and velocity Intensity and frequency Frequency and number of harmonic
26 The velocity of sound in air not effected by changes in Moisture contents in air Temperature of air The atmosphere pressure The composition of air
27 The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be 1 : 2 4 : 1 1 : 4 2 : 1
28 It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice Has a definite pitch Has a definite quality Has a definite capacity Can penetrate the wall
29 If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is 360 m/s 306 m/s 331 m/s 340 ms
30 To hear a clear echo, the reflecting surface must be at a minimum distance of 10 m 16.5 m 33 m 66 m
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