ECAT Physics Online Test With Answers

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ECAT Physics Online Test

Sr. # Questions Answers Choice
1 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>
2 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
3 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
4 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
5 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
6 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
7 An isochoric process is one which take place at Constant internal energy Constant entropy Constant volume Constant pressure
8 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
9 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
10 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>
11 Energy gas behaves like an ideal gast at High temperature and low pressure Low temperature and high pressure Both A and B None
12 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
13 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>
14 At O° K which of the following properties of a gas will be zero? Kinetic energy Potential energy Vibrational energy Density
15 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
16 Boyle's law is applicable in Isochoric process Isothermal process Isobaric process Isotonic process
17 Absolute temperature can be calculated by Means squares velocity Motion of the molecule Both A and B None of these
18 Which of the following is not thermo dynamical function? Enthalpy Work done Gibb's energy Internal energy
19 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
20 The number of translation degress of freedom for a diatomic gas is 2 3 5 6
21 Fidelity refers to Reproduction of original sound Reproduction of original image Reproduction of music Reproduction of a CD from original copy
22 The loudness and pitch of a sound note depends on Intensity and velocity Frequency and velocity Intensity and frequency Frequency and number of harmonic
23 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
24 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
25 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
26 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
27 To hear a clear echo, the reflecting surface must be at a minimum distance of 10 m 16.5 m 33 m 66 m
28 The speed of sound in a medium depends on The elastic property but not on the inertia property The inertia property but not on the elastic property The elastic property as well as the inertia property Neither the elastic property nor the inertia property
29 When two waves with same frequency and constant phase difference phase difference interfere There is a gain of energy There is a loss of energy The energy is redistributed and the distribution changes with time The energy is redistributed and the distribution remains constant with time
30 Which of the following changes at an antinode in a stationary wave? Density only Pressure only Both pressure and density Neither pressure nor density
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