NEET TEST SERIES 90 PHYSICS
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1. At a given temperature which of the following gases possesses maximum r.m.s. velocity?
a) Hydrogen
b) Oxygen
c) Nitrogen
d) Carbon dioxide
Deselect Answer
a)
b)
c)
d)
None
2. Electric lines of force about a negative point charge are
a) circular anticlockwise
b) circular clockwise
c) radial, inwards
d) radial, outwards
Deselect Answer
a)
b)
c)
d)
None
3. The electric potential inside a conducting sphere
a) increases from centre to surface
b) decreases from centre to surface
c) remains constant from centre to surface
d) is zero at every point inside
Deselect Answer
a)
b)
c)
d)
None
4. A wire of resistance 12 ohms per meter is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in the figure, is
a) 3Ω
b) 6πΩ
c) 6Ω
d) 0. 6πΩ
Deselect Answer
a)
b)
c)
d)
None
5. When hydrogen atom is in its first excited level, its radius is
a) four times, it ground state radius
b) twice times, it ground state radius
c) same times, it ground state radius
d) half times, it ground state radius.
Deselect Answer
a)
b)
c)
d)
None
6. Taking the Bohr radius as a
0
= 53 pm, the radius of Li
++
ion in its ground state, on the basis of Bohr’s model, will be about
a) 53 pm
b) 27 pm
c) 18 pm
d) pm
Deselect Answer
a)
b)
c)
d)
None
7
. Assertion:
Neutrons penetrate matter more readily as compared to protons.
Reason:
Neutrons are slightly more massive than protons.
a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
c) If Assertion is correct but Reason is incorrect.
d) If both the Assertion and Reason are incorrect.
Deselect Answer
a)
b)
c)
d)
None
8. The current through an ideal PN-junction shown in the following circuit diagram will be
a) zero
b) 1 mA
c) 10 mA
d) 30 mA
Deselect Answer
a)
b)
c)
d)
None
9. In a p-type semiconductor the acceptor level is situated 60 meV above the valence band. The maximum wavelength of light required to produce a hole will be
a) 0.207 × 10
-5
m
b) 2.07 × 10
-5
m
c) 20.7 × 10
-5
m
d) 2075 × 10
-5
m
Deselect Answer
a)
b)
c)
d)
None
10. Which logic gate with inputs and performs the same operation as that performed by the following circuit?
a) NAND gate
b) OR gate
c) NOR gate
d) AND gate
Deselect Answer
a)
b)
c)
d)
None
11. A body is executing S.H.M. when its displacement from the mean position is 4 cm and 5 cm, the corresponding velocity of the body is 10 cm/sec and 8 cm/sec. Then the time period of the body is
a) π sec
b) 2π sec
c) 3π sec
d) 4π sec
Deselect Answer
a)
b)
c)
d)
None
12. When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is V4. The threshold wavelength surface is:
a) 5λ
b) 2λ
c) 3λ
d) 4λ
Deselect Answer
a)
b)
c)
d)
None
13. An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5cm deep when viewed from one surface and 3cm deep when viewed from the opposite face. The thickness (in cm) of the slab is
a) 12
b) 16
c) 8
d) 10
Deselect Answer
a)
b)
c)
d)
None
14. In Young’s double-slit experiment, the slits are 2mm apart and are illuminated by photons of two wavelengths λ
1
=12000Å and λ
2
=10000Å. At what minimum distance from the common central bright fringe on the screen 2m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?
a) 8mm
b) 6mm
c) 4mm
d) 3mm
Deselect Answer
a)
b)
c)
d)
None
15. An inductor 20mH, a capacitor 50μF and a resistor 40Ω are connected in series across of emf V=10sin340t. The power loss in A.C. circuit is
a) 0.67 W
b) 0.76 W
c) 0.89 W
d) 0.51 W
Deselect Answer
a)
b)
c)
d)
None
16. The magnetic energy stored in an inductor of inductance 4μH carrying a current of 2 A is:
a) 4mJ
b) 8mJ
c) 8μJ
d) 4μJ
Deselect Answer
a)
b)
c)
d)
None
17. The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance
a) 1.389 H
b) 138.88 H
c) 0.138 H
d) 13.89 H
Deselect Answer
a)
b)
c)
d)
None
18. In an electromagnetic wave in free space the root mean square value of the electric field is E
rms
=6V/m. The peak value of the magnetic field is
a) 2.83×10
−8
T
b) 0.70×10
−8
T
c) 4.23×10
−8
T
d) 1.41×10
−8
T
Deselect Answer
a)
b)
c)
d)
None
19. Which of the following magnetic material is temperature dependent?
a) Diamagnetism
b) Ferromagnetism
c) Paramagnetism
d) None of these
Deselect Answer
a)
b)
c)
d)
None
20. Two wires are made of the same material and have the same volume. However, wire 1 has cross-sectional area A and wire 2 has cross-sectional area 3A. If the length of wire 1 increases by Δx on applying force F, how much force is needed to stretch wire 2 by the same amount?
a) 4F
b) 6F
c) 9F
d) F
Deselect Answer
a)
b)
c)
d)
None
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