Part Test 6 for NEET 2021

Each testis has how many testicular lobules :-

Identical twins will be produced when :

Correct sequence in development is :

Foetal ejection reflex in human female is induced by

Cremaster muscles are found in

For which of the following is magnetic susceptibility negative?

A uniform electric field and a uniform magnetic field are acting in the same direction in a certain region. If a proton is projected in this region such that its velocity is pointed along the direction of fields, then the proton :

The Hysteresis loops for two magnetic materials A and B are given below

These materials are used to make magnets for transformer core, electric generators and electromagnet core. Which of the following is true about the given magnets?

Which of the following is the unit of magnetic flux density?

When an electron enters perpendicularly in a magnetic field with velocity v, time period of its revolution is T. If it enters in the same magnetic field with a velocity 2v, then its time period will be:

The magnetism of a magnet is due to

The magnetic field at a point x on the axis of a mall bar magnet is equal to the field at a point y on the equator of the same magnet. The ratio of the distances of x and y from the centre of the magnet is

Which of the following materials is the most suitable for making a permanent magnet?

When a 12 Ω resistor is connected in parallel with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is :

A sensitive magnetic field instrument can be effectively shielded from the external magnetic field by placing it inside which of the following materials?

A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into a voltmeter of range nV volts is :

A long magnet is cut into two parts such that the ratio of their lengths is 2:1. What is the ratio pole strength of both the section?

Which of the following statements is true about magnetic field intensity?

A moving coil galvanometer has a resistance of 50 Ω and gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1A :

What happens to the magnetic needle kept in a non-uniform magnetic field?

The ratio of magnetic moments of two short magnets which give null deflection in tan B position at 12 cm and 18 cm from the centre of a deflection magnetometer is

The resistance of a galvanometer is 50 ohms and the current required to give full-scale deflection is 100μA . In order to convert it into an ammeter, reading up to 10A, it is necessary to put a resistance of :

What is the torque acting on the bar magnet of moment M which is placed in a uniform field H making an angle of 30⁰ with the field?

The magnetic induction at a point P which is distant 4 cm from a long current carrying wire is 10^-8 Tesla . The field of induction at a distance 12 cm from the same current would be

What happens to the magnetic moment if a hole is made at the centre of a bar magnet?

Which of the following statements is true about magnetic lines of force?

A vertical wire kept in Z-X plane carries a current from Q to P (see figure). The magnetic field due to current-carrying wire will have the direction at the origin O along :’

A circular coil ‘A’  has a radius R and the current flowing through it is I. Another circular coil ‘B’ has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of (i.e. BA to BB):

Magnetic lines of force of a bar magnet do not intersect because

Two small bar magnets are placed in air at a distance r apart. The magnetic force between them is proportional to

The magnetic field at a point x on the axis of a small bar magnet is equal to the field at a point y on the equator of the same magnet. The ratio of the distances of x and y from the centre of the magnet is

Force between two identical bar magnets whose centres are r metre apart  is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to

Two similar bar magnets P and Q, each of magnetic moment M, are taken. If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have

Assertion:  Faraday’s laws are consequences of conservation of energy. 

Reason: In a purely resistive A.C. circuit, the current lags behind the e.m.f. in phase.

The magnetic needle of a tangent galvanometer is deflected at an angle 30° due to a magnet. The horizontal component of earth’s magnetic field 0.34 x 10^-4 T is along the plane of the coil. The magnetic intensity is

The ease of liquefication of noble gases decreases in the order

Which of the following interhalogen compound is not possible?

In the clathrates of xenon with water ,the nature of bonding between xenon and water molecule is

Xenon combines withF₂ in ratio of 1:20 to form a compound whose shape is

Which oxide of manganese is acidic in nature ?

Which of the following compounds is used as the starting material for the preparation of potassium dichromate?

The equilibrium

The blue colour produced on adding H₂O₂ to acidified K₂Cr₂O₇ is due to the formation of

When intimate mixture of potassium dichromate and potassium chloride is heated with conc. H₂SO₄ which of the following is produced in the form of red vapours?

A. CrO₃

B. Cr₂O₃

C. CrO₂Cl₂

D. CrCl₂

1. 4K₂Cr₂O₇ à 4K₂CrO₄ +3O₂+X, in this reaction X is

A. CrO₃

B. Cr₂O₇

C. Cr₂O₃

D. CrO₅

The most abundant transition metal is

1. The general outer electronic configuration of transition elements is

A. (n-1) d^1-10 ns ^1-2

B. (n-1) d^1-10 ns²

C. (n-1) d^1-10 ns^10-2

D. (n-1) s² nd^1-10

The most common oxidation state of lanthanides is

Red phosphorus is less reactive than yellow phosphorus because

Which of the following is used in smoke screens?

1. There is S-S bond in

A. S₂O₄^2-

B. S₂O₆^2-

C. S₂O₃^2-

D. S₂O₇^2-

1. Which is known asCaro’s acid ?

A. H₂SO₃

B. H₂SO₅

C. H₂S₂O₈

D. H₂S₂O₇

1. When SO₂ is passed through acidified K₂Cr₂O₇ solution

A. The solution is turned blue

B. The solution is decolourised

C. SO₂ is reduced

D. Green Cr₂(SO₄)₃ is formed

The allotropic form of phosphorus which is called metallic phosphorus is

Concentrated sulphuric acid is not

1. An oxy acid which on heating forms a hydride

A. HNO₃

B. HClO₃

C. HClO₄

D. H₃PO₃

Which of the following reaction is possible?

A. I₂ + 2NaBr à Br₂+2Nal

B. I₂ + 2NaCl à Cl₂ + 2NaCl

C. Br₂ + 2NaCl àCl₂ + 2NaBr

D. Cl₂ + 2NaBr à Br₂ + 2NaCl

1.     Which of the hydrogen halides forms salts like KHX₂ (where X is a halogen atom)?

Which of the following inert gas is least polarized ?

HF is not stored in glass bottles because

Iodine will be able to displace chlorine from

A. KClO3

B. KCl

C. HCl

D. BaCl2

Chlorine gas is dried over

Which of the following forms acid salts?

When I₂ is passed through KCL , KF and KBr

A.  Cl2 and Br2 are evolved

B. Cl2 is evolved

C. Cl2,F2 and Br are evolved

D. None of the gas is formed

In SiO₂, N₂O₅, SO₃, Cl₂O₇ the decreasing order of acidic strength is

A. Cl₂O₇ > SO₃ > N₂O₅ > SiO₂

B. Cl₂O₇ > N₂O₅ > SO₃ > SiO₂

C. SiO₂ < SO₃ > Cl₂O₇ > N₂O₅

D. N₂O₅ > Cl₂O₇ > SO₃ > SiO₂