Part Test 5 for NEET 2021

Antiparallel strands of a DNA molecule means that

Which of the following is wrongly matched ?

Quaternary structure is present in ________

Which of the following is responsible for ABO grouping?

What is true about RBCs in humans?

Anaemia disease is caused by

Birds and Mammals have :

Erythropoiesis occurs in which group of tissue-

The state of hybridization of C₂,C₃,C₅ and C₆ of the hydrocarbon, Is in the following sequence

(a) sp,sp³,sp² and sp³ (b) sp³,sp²,sp² and sp

(c)sp,sp²,sp² and  sp³                  (d) sp,sp²,sp³ and sp²

The structure of iso-butyl group in organic compound is

Which nomenclature is not according to IUPAC system?

The correct IUPAC name of the compound is

The IUPAC name of

The IUPAC name of

Correct the increasing order of acidity is as

A. H₂O,C₂H₂,H₂CO₃, phenol

B. C₂H₂,H₂O,H₂CO₃, phenol

C. phenol, C₂H₂,H₂CO₃,H₂O

D. C₂H₂,H₂O, phenol and H₂CO₃

Which of the following carbocations is expected to be most stable?

Arrange the following carbocations in order of stability.

Benzyl(i)     Allyl(ii)                 methyl(iii)           vinyl(iv)

Choose the correct option

Which of the following is an incorrect representation

Consider the following carbanions

Correct order of stability is

In which of the following, the substituent does not event its resonance effect?

(a) C₂H₅NH₂                         (b) C₆H₅N⁺H₃       (C) C₆H₅OH          (d) C₆H₅Cl

Which of the following is correct with respect to -/ effect of the substituents?(R=alkyl)

Hyperconjugation involves delocalization

Consider the following compounds

Hyperconjugation occurs in

can be named as

The correct order of decreasing acidic strength of trichloroacetic acid (A), trifluoroacetic acid (B), Acetic acid (C) and formic acid (D) is

Impure glycerine can be purified by

The sodium extract of an organic compound on acidification with acetic acid and addition of lead acetate solution gives a black precipitate. The organic compound contains

In an organic compound , phosphorus is estimated as

(a) Mg₂P₂O₇

(b) Mg₃(PO₄)₂

(c) H₃PO₄

(d) P₂O₅

In the Kjeldahl’s for  estimation of nitrogen present in a soil sample , ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H₂SO₄. The percentage of nitrogen in the soil is

What is the decreasing order of strength of  the bases?

Electronegativity of carbon atoms depends upon their state of hybridization. In which of the following compounds, the carbon marked the asterisk is most electronegative?

Select the incorrect statement.

Four carbocations (I) – (IV) are given below

The increasing order of stability of the cations will be

The most stable carbocation among the following

Identify the correct statements among the following

(I) Removal of a proton from   leads to a more stable carbocation.

(II) The hydrogen bonding is strong in S—H –S

(III) The central carbon atom in a (CH3)3C free radical possesses 5 electrons.

(IV) The number of σ bonds in but -1-en-3-yne is 7.

pK_a value is least for

(a)  (CH₃)₃C—COOH

(b) BrCH₂—CH₂—CH₂—COOH

(c) CH₃—CCl₂—COOH

(d) CH₃—CHCl—COOH

Least stable among the carbocations given is

By how much does kinetic energy increase if the momentum is increased by 20%

Calculate the energy loss in a perfectly inelastic collision if the mass of the object is 40kg with velocity 4m/s hits the object of mass 60kg with velocity 2m/s.

Calculate the final kinetic energy of a block of mass if the mass of the block is 10kg and has a constant velocity of 10m/s. The block of mass is subjected to a retarding force of F=0.1J/m

What is the average power required to lift a mass of 100kg to a height of 50m in 50 seconds?

What is the power of the engine when the velocity of the car is v, mass m, acceleration a, and external resistance R

Consider an object with m as its mass such that it is accelerated uniformly from rest and the speed attained by the object is v in T time.  Calculate the instantaneous power that is delivered to the body in terms of function of time

A ball is thrown from a height of 20 m vertically downward and has an initial velocity of v20. As the stone collides with the ground 50% of its energy is lost and bounce back to the same height. What is the initial velocity?

Consider a particle of mass m which is driven by a machine that has a constant power k Watts. What is the force on the particle at time t if the particle starts from the rest?

When can one say that work is done on the body

Select the incorrect statement for the given situation: Two bodies with mass m₁ and m₂ undergo elastic collision

What is the ratio of velocities of a nucleus that splits into two parts with radii 1:2

What is the relation between E, P, and E if E is kinetic energy, P is momentum, and V is the velocity of the particle

What is the percentage error in the measurement of the kinetic energy of a body, if there is a positive error of 50% in the speed of the body

What is the dimensional formula of torque and energy

(a) [ML^-3T^-2] and [MLT^-2]

(b) [ML²T^-2] and [MLT^-2]

(c) [ML²T^-2] and [ML²T²]

(d) [MLT²] and [ML²T²]

Find the relative error of y, if y=x²

Following are the readings obtained while measuring the diameter of a wire by using the screw gauge 0 mm is the main scale reading 52 divisions are the circular scale reading

What is the diameter of the wire if 1 mm on the main scale is equal to the 100 divisions on the circular scale

The dimensions of universal gravitational constant are

Dimensions of permeability are

Which of the following pair does not have similar dimensions  

E, m, l and G denote energy, mass, angular momentum and gravitational constant respectively, then the dimension of El^2/m^5G^2 are

A block of mass 10 kg, moving in the x-direction with a constant speed of 10 ms^-1, is subjected to a retarding force F=0.1x J/m during its travel from x=20m to 30m. Its final KE will be :

A ball is thrown vertically downwards from a height of 20m with an initial velocity v_o . It collides with the ground, loses 50% of it’s energy in collision and rebounds to the same height. The initial velocity v_o is (Take, g = 10 ms^-2)

Which of the following pair does not have similar dimensions  

A ball moving with velocity 2 ms-1 collides head on with another stationery ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (in ms-1) after collision will be

An engine pumps water through a hosepipe. Water passes through the pipe and leaves it with a velocity of 2 ms−1.The mass per unit length of water in the pipe is 100 kgm-1.What is the power of the engine?

A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially un stretched. The maximum extension produced in the length of the spring will be

In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%,3% and 4% respectively. Quantity P is calculated as follows P=a³b²/cd %, Error in P is

The density of material in CGS system of units is 4g/cm3.In a system of units in which unit of length is 10cm and unit of mass is 100g, when the value of density of material in this system will be-

A student measures the distance traversed in free fall of a body, initially at rest in a given time. He uses this data to estimate g, the acceleration due to gravity. If the maximum percentage errors in measurement of the distance and the time are e1e1 and e2e2 respectively, the percentage error in the estimation of g is

If the dimension of a physical quantity are given by M^aL^bT^c, then the physical quantity will be