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Test: NEET 2017 Past Year Paper - Question 1

A spring of force constant k is cut into lengths of ratio 1: 2 : 3. They are connected in series and the new force constant is k'. Then they are connected in parallel and force constant is k''. Then k' : k'' is

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 1
For ratio constant x,1/k'=(1/1+1/2+1/3)x k'=6/11x k"=(1+2+3)x=6x k'/k"=1/11
Test: NEET 2017 Past Year Paper - Question 2

The ratio of resolving powers of an optical microscope for two wave lengths λ1 = 4000 Å and λ2  = 6000 Å is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 2

Test: NEET 2017 Past Year Paper - Question 3

The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system?

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 3

Difference between any two consecutive frequencies

So fundamental frequency = 20 Hz

Test: NEET 2017 Past Year Paper - Question 4

Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take 'g' constant with a value 10 m/s2. The work done by the

(i) gravitational force and the

(ii) resistive force of air is :-
 

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 4

Test: NEET 2017 Past Year Paper - Question 5

A physical quantity of the dimensions of length that can be formed out of is velocityof light, G is universal constant of gravitation and e is charge] :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 5

Test: NEET 2017 Past Year Paper - Question 6

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 6

Test: NEET 2017 Past Year Paper - Question 7

A capacitor is charged by a battery. The battery isremoved and another identical uncharged capacitoris connected in parallel. The total electrostaticenergy of resulting system :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 7

Decreases by a factor of 2

Charge on capacitor
q = CV
when it is connected with another uncharged capacitor.


Test: NEET 2017 Past Year Paper - Question 8

In a common emitter transistor amplifier the audio signal voltage across the collector is 3V. The resistance of collector is 3 kΩ. If current gain is 100 and the base resistance is 2 kΩ, the voltage and power gain of the amplifier is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 8

Test: NEET 2017 Past Year Paper - Question 9

Thermodynamic processes are indicated in the following diagram :

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 9

Process (1) → volume constant → Isochroic

Process (2) → adiabatic

Process (3) → Temperature constant → Isothermal

Process (4) → Pressure constant → Isobaric

Test: NEET 2017 Past Year Paper - Question 10

Suppose the charge of a proton and an electrondiffer slightly. One of them is – e, the other is(e + De). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomicsize) apart is zero, then De is of the order of[Given mass of hydrogen mh = 1.67 × 10–27 kg]

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 10

we know, a hydrogen atom has one electron and one proton
so, net charge on each hydrogen atom = (e + ∆e - e) = ∆e
so, electrostatic force , 
gravitational force, 
where Mh denotes mass of hydrogen
a/c to question,
gravitational force = electrostatic force


we know, K = 9 × 109 Nm²/C², G = 6.67 × 10-11 Nm²/Kg² , Mh = 1.67 × 10-27 Kg
so, 9 × 109 × ∆e² = 6.67 × 10-11 × (1.67 × 10-27)²
or, ∆e² = 6.67 × 10-11 × 1.67 × 1.67 × 10-54/9 × 109
or, ∆e = 1.43767 × 10-37 C

Test: NEET 2017 Past Year Paper - Question 11

The resistance of a wire is 'R' ohm. If it is meltedand stretched to 'n' times its original length, its newresistance will be :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 11

Test: NEET 2017 Past Year Paper - Question 12

The given electrical network is equivalent to :

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 12

Test: NEET 2017 Past Year Paper - Question 13

The de-Broglie wavelength of a neutron in thermalequilibrium with heavy water at a temperature T(Kelvin) and mass m, is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 13

Kinetic energy of thermal neutron with equilibrium

Test: NEET 2017 Past Year Paper - Question 14

Which one of the following represents forward bias diode ?

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 14

Test: NEET 2017 Past Year Paper - Question 15

A long solenoid of diameter 0.1 m has 2 × 104 turnsper meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axiscoinciding with the solenoid axis. The current in thesolenoid reduces at a constant rate to 0A from 4 A in 0.05 s. If the resistance of the coil is 10π2Ω.the total charge flowing through the coil during thistime is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 15




Test: NEET 2017 Past Year Paper - Question 16

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time t2. The time taken by her to walk up on the moving escalator will be

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 16

As we learnt in
Case of Relative velocity -
When A & B are moving along with straight line in opposite direction.

Relative velocity of A with respect to B is.

Test: NEET 2017 Past Year Paper - Question 17

Young's double slit experment is first performed inair and then in a medium other than air. It is foundthat 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of themedium is nearly :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 17

Fringe Width in a medium -

- where in
Since wavelength in a medium become

Fringe width in air 
Fringe width in any other medium 
According to question

Test: NEET 2017 Past Year Paper - Question 18

A beam of light from a source L is incident normallyon a plane mirror fixed at a certain distance x fromthe source. The beam is reflected back as a spoton a scale placed just above the source I. When themirror is rotated through a small angle q, the spotof the light is found to move through a distance yon the scale. The angle q is given by :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 18

Test: NEET 2017 Past Year Paper - Question 19

If θ1 and θ2 be the apparent angles of dip observedin two vertical planes at right angles to each other,then the true angle of dip θ is given by :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 19

Test: NEET 2017 Past Year Paper - Question 20

Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s] :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 20

Test: NEET 2017 Past Year Paper - Question 21

Two blocks A and B of masses 3 m and mrespectively are connected by a massless andinextensible string. The whole system is suspendedby a massless spring as shown in figure. Themagnitudes of acceleration of A and B immediatelyafter the string is cut, are respectively :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 21

Test: NEET 2017 Past Year Paper - Question 22

A thin prism having refracting angle 10° is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass ofrefractive index 1.7. This combination produces dispersion without deviation. The refracting angleof second prism should be :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 22

(μ -1)A + (μ'-1)A = 0
(μ-1)A |(μ'-1)A'|
(1.42 -1)x10° = (1.7 -1)A'
4.2 = 0.7A'
A' = 6°

Test: NEET 2017 Past Year Paper - Question 23

The acceleration due to gravity at a height 1 km above the earth is the same as at a depth d below the surface of earth. Then:-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 23

Test: NEET 2017 Past Year Paper - Question 24

A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 24

In zero deflection condition, potentiometer draws
no current.

Test: NEET 2017 Past Year Paper - Question 25

A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 25

Test: NEET 2017 Past Year Paper - Question 26

Figure shows a circuit that contains three identicalresistors with resistance R = 9.0 Ω each, two identical inductors with inductance L = 2.0 m Heach, and an ideal battery with emf ε = 18 V. Thecurrent 'i' through the battery just after the switch closed is,...... :-  

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 26

Test: NEET 2017 Past Year Paper - Question 27

Radioactive material 'A' has decay constant '8 λ' andmaterial 'B' has decay constant 'λ'. Initially they havesame number of nuclei. After what time, the ratioof number of nuclei of material 'B' to that 'A' will be 1/e?

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 27

Test: NEET 2017 Past Year Paper - Question 28

The diagrams below show regions of equipotentials:-

A positive charge is moved from A to B in each diagram.
 

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 28

W = qΔV
as ΔV is same in all conditions, work will be same.

Test: NEET 2017 Past Year Paper - Question 29

Two astronauts are floating in gravitational free space after having lost contact with their spaceship.The two will :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 29

In the space, the external gravity is absent, but there will be a very small gravitational force between the astronauts, due to which both will move towards earth other with a very small acceleration. So, the best correct answer should be (a).

Test: NEET 2017 Past Year Paper - Question 30

The x and y coordinates of the particle at any timeare x = 5t – 2t2 and y = 10t respectively, wherex and y are in meters and t in seconds. Theacceleration of the particle at t = 2s is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 30

Test: NEET 2017 Past Year Paper - Question 31

One end of string of length l is connected to aparticle of mass 'm' and the other end is connectedto a small peg on a smooth horizontal table. If theparticle moves in circle with speed 'v' the net forceon the particle (directed towards centre) will be (T represents the tension in the string) :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 31

Net force on the particle in uniform circular motion is centripetal force, which is provided by the tension in string.

Test: NEET 2017 Past Year Paper - Question 32

A particle executes linear simple harmonic motion with an amplitude of 3 cm. When the particle is at 2 cm from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 32

Test: NEET 2017 Past Year Paper - Question 33

Two Polaroids P1 and P2 are placed with their axisperpendicular to each other. Unpolarised light I0 isincident on P1 . A third polaroid P3 is kept in betweenP1 and P2 such that its axis makes an angle 45° withthat of P1 . The intensity of transmitted light throughP2 is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 33

Test: NEET 2017 Past Year Paper - Question 34

The bulk modulus of a spherical object is 'B'. If itis subjected to uniform pressure 'p', the fractional decrease in radius is:-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 34

Test: NEET 2017 Past Year Paper - Question 35

In an electromagnetic wave in free space the root meansquare value of the electric field is Erms = 6V/m. Thepeak value of the magnetic field is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 35

Test: NEET 2017 Past Year Paper - Question 36

A rope is wound around a hollow cylinder of mass3 kg and radius 40 cm. What is the angularacceleration of the cylinder if the rope is pulled witha force of 30 N ?

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 36

Test: NEET 2017 Past Year Paper - Question 37

Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities ω1 and ω2 . They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is:-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 37

Test: NEET 2017 Past Year Paper - Question 38

The photoelectric threshold wavelength of silver is3250 × 10–10m. The velocity of the electron ejected from a silver surface by ultraviolet light ofwavelength 2536 × 10–10 m is :-

(Given h = 4.14 × 10–15 eVs and c = 3 × 108 ms–1)

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 38

Test: NEET 2017 Past Year Paper - Question 39

A 250-Turn rectangular coil of length 2.1 cm andwidth 1.25 cm carries a current of 85 µA and subjectedto magnetic field of strength 0.85 T. Work done forrotating the coil by 180º against the torque is:-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 39

W = MB (cosθ1– cosθ2)
When it is rotated by angle 180º then
W = 2MB
W = 2 (NIA)B
= 2 x 250 x 85 x 10-6[1.25 x 2.1 x 10-4] x 85 x 10-2
= 9.1μJ

Test: NEET 2017 Past Year Paper - Question 40

The ratio of wavelengths of the last line of Balmerseries and the last line of Lyman series is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 40

Test: NEET 2017 Past Year Paper - Question 41

A carnot engine having an efficiency of 1/10 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 41

Test: NEET 2017 Past Year Paper - Question 42

A gas mixture consists of 2 moles of O2 and 4 molesof Ar at temperature T. Neglecting all vibrationalmodes, the total internal energy of the system is :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 42

Test: NEET 2017 Past Year Paper - Question 43

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying
same current 'I along the same direction is shown in fig. Magnitude of force per unit length on the middle wire 'B' is given by :-

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 43

Test: NEET 2017 Past Year Paper - Question 44

A U tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is :-

 

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 44

Test: NEET 2017 Past Year Paper - Question 45

Which of the following statements are correct ?

(a) Centre of mass of a body always coincides with the centre of gravity of the body

(b) Central of mass of a body is the point at which the total gravitational torque on the body is zero

(c) A couple on a body produce both translational and rotation motion in a body

(d) Mechanical advantage greater than one means that small effort can be used to lift a large load
 

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 45

Centre of mass may lie on centre of gravity net torque of gravitational pull is zero about centre of mass.

Test: NEET 2017 Past Year Paper - Question 46

Name the gas that can readily decolourise acidified KMnO4 solution :

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 46

Test: NEET 2017 Past Year Paper - Question 47

Mechanism of a hypothetical reaction


 

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 47

Test: NEET 2017 Past Year Paper - Question 48

The element Z = 114 has been discovered recently.It will belong to which of the following family/groupand electronic configuration ?

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 48

Test: NEET 2017 Past Year Paper - Question 49

The heating of phenyl–methyl ethers with HIproduces

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 49

Test: NEET 2017 Past Year Paper - Question 50

Which one is the correct order of acidity ?

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 50

Acidic strength ∝ Electronegativity of Carbon ∝ % s−character
Correct order of acidic strength

Test: NEET 2017 Past Year Paper - Question 51

Predict the correct intermediate and product in the following reaction :

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 51

Test: NEET 2017 Past Year Paper - Question 52

The equilibrium constant of the following are :

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 52

Test: NEET 2017 Past Year Paper - Question 53

Which one is the most acidic compound ?

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 53

Test: NEET 2017 Past Year Paper - Question 54

The correct increasing order of basic strength for the following compounds is :

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 54

Test: NEET 2017 Past Year Paper - Question 55

Ionic mobility of which of the following alkali metalions is lowest when aqueous solution of their saltsare put under an electric field ?

Detailed Solution for Test: NEET 2017 Past Year Paper - Question 55

Test: NEET 2017 Past Year Paper - Question 56

The most suitable method of separation of 1 : 1mixture of ortho and para-nitrophenols is :