NEET 2021 Question Paper with Solutions

The velocity of a small ball of mass M and density d when dropped in a container filled with glycerin becomes constant after some time. If the density of glycerin is \(\frac{d}{2}\) then the viscous force acting on the ball will be: 2Mg \(2Mg\) \(Mg\) \(\frac{3}{2}Mg\)

Match Column - I and Column - II and choose the correct match from the given choices. Column - I Column - II (A) Root mean square speed of gas molecules (P) \(\frac{1}{3}nm\bar{v}^2\) (B) Pressure exerted by ideal gas (Q) \(\sqrt{\frac{3RT}{M}}\) (C) Average kinetic energy of a molecule (R) \(\frac{5}{2}RT\) (D) Total internal energy of 1 mole of a diatomic gas (S) \(\frac{3}{2}k_BT\) (A) - (R) (B) - (Q) (C) - (P) (D) - (S) (A) - (R) (B) - (P) (C) - (S) (D) - (Q) (A) - (Q) (B) - (R) (C) - (S) (D) - (P) (A) - (Q) (B) - (P) (C) - (S) (D) - (R)

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 \(m/s^2\)) 7.0 kW 10.2 kW 8.1 kW 12.3 kW

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 - 0.628 s 0.0628 s 6.28 s 3.14 s

A cup of coffee cools from \(90^\circ C\) to \(80^\circ C\) in t minutes when the room temperature is \(20^\circ C\). The time taken by a similar cup of coffee to cool from \(80^\circ C\) to \(60^\circ C\) at a room temperature same at \(20^\circ C\) is: \(\frac{5}{13}t\) \(\frac{13}{10}t\) \(\frac{13}{5}t\) \(\frac{10}{13}t\)

For irreversible expansion of an ideal gas under isothermal condition the correct option is: \(\Delta U \neq 0 \Delta S_{total} = 0\) \(\Delta U = 0 \Delta S_{total} = 0\) \(\Delta U \neq 0 \Delta S_{total} \neq 0\) \(\Delta U = 0 \Delta S_{total} \neq 0\)

\(BF_3\) is planar and electron deficient compound. Hybridization and number of electrons around the central atom respectively are: \(sp^2\) and 8 \(sp^3\) and 4 \(sp^3\) and 6 \(sp^2\) and 6

From the following pairs of ions which one is not an iso-electronic pair? \(Fe^{2+} Mn^{2+}\) \(O^{2-} F^-\) \(Na^+ Mg^{2+}\) \(Mn^{2+} Fe^{3+}\)

Tritium a radioactive isotope of hydrogen emits which of the following particles? Neutron (n) Beta (\(\beta^-\)) Alpha (\(\alpha\)) Gamma (\(\gamma\))

The compound which shows metamerism is: \(C_4H_{10}O\) \(C_5H_{12}\) \(C_3H_8O\) \(C_3H_6O\)

Find the value of the angle of emergence from the prism. Refractive index of the glass is \(\sqrt{3}\). \(90^\circ\) \(60^\circ\) \(30^\circ\) \(45^\circ\)

A series LCR circuit containing 5.0 H inductor 80 \(\mu F\) capacitor and \(40\Omega\) resistor is connected to 230 V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be: 42 rad/s and 58 rad/s 25 rad/s and 75 rad/s 50 rad/s and 25 rad/s 46 rad/s and 54 rad/s

The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them. No current will flow in p-type current will only flow in n-type Current in n-type = current in p-type current in p-type > current in n-type current in n-type > current in p-type

A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V 44 W lamp. Ignoring power losses in the transformer what is the current in the primary circuit? 4 A 0.2 A 0.4 A 2 A

A dipole is placed in an electric field as shown. In which direction will it move? towards the right as its potential energy will increase. towards the left as its potential energy will increase. towards the right as its potential energy will decrease. towards the left as its potential energy will decrease.

The product formed in the following chemical reaction is:

The molar conductance of NaCl HCl and \(CH_3COONa\) at infinite dilution are 126.45 426.16 and \(91.0\ \text{S cm}^2\ mol^{-1}\) respectively. The molar conductance of \(CH_3COOH\) at infinite dilution is. Choose the right option for your answer. \(540.48\ \text{S cm}^2\ mol^{-1}\) \(201.28\ \text{S cm}^2\ mol^{-1}\) \(390.71\ \text{S cm}^2\ mol^{-1}\) \(698.28\ \text{S cm}^2\ mol^{-1}\)

The intermediate compound 'X' in the following chemical reaction is:

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them. Noble gases have large positive values of electron gain enthalpy Noble gases are sparingly soluble in water Noble gases have very high melting and boiling points Noble gases have weak dispersion forces

Statement I: Acid strength increases in the order given as HF << HCl << HBr << HI. Statement II: As the size of the elements F Cl Br I increases down the group the bond strength of HF HCl HBr and HI decreases and so the acid strength increases. In the light of the above statements choose the correct answer from the options given below