NEET 2021

184 Questions • 180 Minutes • 2021

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Q41
The molar conductivity of 0.007 M acetic acid is 20 S $cm^2$ $mol^{-1}$. What is the dissociation constant of acetic acid? Choose the correct option. [$\Lambda^\circ_{H^+} = 350$ S $cm^2mol^{-1}$, $\Lambda^\circ_{CH_3COO^-} = 50$ S $cm^2mol^{-1}$]
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Q42
The slope of Arrhenius Plot (ln K v/s 1/T) of first order reaction is $-5 \times 10^3$ K. The value of $E_a$ of the reaction is. Choose the correct option for your answer. [Given R = 8.314 $JK^{-1}$ $mol^{-1}$]
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Q43
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?
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Q44
Match List-I with List-II. [table] List-I | List-II ; (A) $[Fe(CN)_6]^{3-}$ | (i) 5.92 BM ; (B) $[Fe(H_2O)_6]^{3+}$ | (ii) 0 BM ; (C) $[Fe(CN)_6]^{4-}$ | (iii) 4.90 BM ; (D) $[Fe(H_2O)_6]^{2+}$ | (iv) 1.73 BM [/table] Choose the correct answer from the options given below.
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Q45
$CH_3CH_2COO^-Na^+ \xrightarrow[Heat]{NaOH,\ +?} CH_3CH_3 + Na_2CO_3$. Consider the above reaction and identify the missing reagent/chemical.
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Q46
If E and G respectively denote energy and gravitational constant, then $\frac{E}{G}$ has the dimensions of:
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Q47
A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : 0 mm Circular scale reading : 52 divisions Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is:
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Q48
If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of energy.
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Q49
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let $S_n$ be the distance travelled by the block in the interval t = n - 1 to t = n. The, the ratio $\frac{S_n}{S_{n+1}}$ is:
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Q50
Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10 $m/s^2$)
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Q51
A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively:
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Q52
The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is:
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Q53
The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is $\frac{d}{2}$, then the viscous force acting on the ball will be:
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Q54
A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80° C to 60°C at a room temperature same at 20°C is:
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Q55
Match Column-I and Column-II and choose the correct match from the given choices. [table] Column-I | Column-II ; (A) Root mean square speed of gas molecules | (P) $\frac{1}{3}nmv^2$ ; (B) Pressure exerted by ideal gas | (Q) $\sqrt{\frac{3RT}{M}}$ ; (C) Average kinetic energy of a molecules | (R) $\frac{5}{2}RT$ ; (D) Total internal energy of 1 mole of a diatomic gas | (S) $\frac{3}{2}k_BT$ [/table]
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Q56
A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is:
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Q57
A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended by it is:
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Q58
Two charged spherical conductors of radius $R_1$ and $R_2$ are connected by a wire. Then the ratio of surface charge densities of the spheres ($\sigma_1/\sigma_2$) is:
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Q59
A parallel plate capacitor has a uniform electric field '$\vec{E}$' in the space between the plates. If the distance between the plates is 'd' and the area of each plate is 'A', the energy stored in the capacitor is: ($\epsilon_0$ = permittivity of free space)
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Q60
In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?
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Paper Info
  • Exam: NEET
  • Year: 2021
  • Questions: 184
  • Duration: 180 mins
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