NTA ABHYAS APP / Paper -07 / PHYSICS / NEET 2020

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28.What is the resulting nucleus when a nucleus (_n^m)X emits one α particle and two β^- particles?
29.Electric displacement is given by D= ∈E, here ,∈=electric permittivity,E=electric field strength.The dimensions of electric displacements are
a.[ML^2TA]
b.[L^(-2) T^(-1)A]
c. [L^(-2) TA]
d.None of these
30.The mean kinetic energy of one mole of gas per degree of freedom (on the basis of kinetic theory of gases) is
a.1/2kT
b.3/2kT
c. 3/2RT
d.1/2RT
31.A parallel beam of light of wavelength 600nm is incident normally on a slit of width a.If the distance between the slit and the screen is 0.8m and the distance of 2nd order minimum from the centre of the screen is 1.5mm ,calculate the width of the slit?
a.9.2 ×10-4 mm
b.6.4 ×10-4 mm
c.6.32 ×10-6 mm
d.None of these
32.Two bodies begin a free fall from rest from the same height 2 seconds apart.How long after the first body begins to fall ,the two bodies will be 40m apart?
a.1 s
b.2 s
c.3 s
d.4 s
33.A particle A is projected from the ground with an initial velocity of 10m/s at an angle of 60° with horizontal.From what height h should an another particle B be projected horizontally with velocity 5 m/s so that both the particles collide in ground at point C if both are projected simultaneously?
a.10 m
b.30 m
c.15 m
d.25 m
34.The path of a positively charged particle 1 through a rectangular region of a uniform electric field is shown in fig. What is the direction of the uniform electric field and what are the directions of deflection of particle 2,3 and 4?
a.Top,down,top,down
b.Top,down,down,top
c.Down,top,top,down
d.Down,top,down,down
35.Near and far points of human eye are
a.25cm and infinite
b.25cm and 100cm
c.55cm and 200cm
d.0cm and 25cm
36.If a body of mass m is moving on a rough horizontal surface of coefficient of kinetic friction µ,the net electromagnetic force exerted by the surface on the body is
a.mg√(1+µ^2 )
b.µmg
c.mg
d.mg√(1-µ^2 )
37.A stone is tied to one end of a string and is rotated in a horizontal circle with a uniform angular velocity.Let T be the tension in the string.If the length of the string is halved and the angular velocity of the stone is doubled,the tension in the string will be
a.2T
b.4T
c.T
d.8T
38.A straight conductor of length 0.4m is moving with a speed of 7m/s perpendicular to the magnetic field of intensity of 0.9 wbm-2 .The induced emf across the conductor will be
a.7.25 V
b.5.52 V
c.1.25 V
d.2.52 V
39.Two sphere A and B have diameters in the ratio 1:2,densities in the ratio 2:1 and specific heat capacities in the ratio 1:3.The ratio of their thermal capacities is
a.1:6
b.1:12
c.1:3
d.1:4
40.A fish is near the centre of a spherical fishbowl filled with water (µ_w=4/3).A child is standing at a distance of 2R from the centre of the bowl,where R is the radius of curvature of bowl.The distance from the centre of the fishbowl ,where child’s nose will appear to the fish is
a.R
b.2R
c.3R
d.4R
41. A conducting circular loop of radius r carries a constant current i.It is placed in a uniform magnetic field B0 which is perpendicular to the plane of the loop.The magnetic force acting on the loop is
a.IrB0
b.2πir B0
c.Zero
d.πir B0
42.An object of mass 4kg and another object of mass 1kg are moving such that they have equal kinetic energies.The ratio of the magnitude of their linear momenta is
a.1:2
b.1:1
c.2:1
d.4:1
43.A bullet of mass 10g moving horizontally with a velocity of 400 m/s strikes a wooden block of mass 2kg which is suspended by a light inextensible string of length 5m.As a result,the centre of gravity of the block is found to rise a vertical distance of 10cm.The speed of the bullet after it emerges out horizontally from the block will be
a.100 m/s
b.80 m/s
c.120 m/s
d.160 m/s
44.The ratio of the magnetic field at the centre of a current carrying circular coil to its magnetic moment is x.If the current and radius both are doubled ,the new ratio will become
a.2x
b.4x
c.x/4
d.x/8
45.In a series L-R circuit,under which condition the power loss will be least for an a.c. voltage source?
a.High resistance and high inductance
b.High resistance and low inductance
c.Low resistance and high inductance
d.Low resistance and low inductance