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Sr. No.
Physics Model Question Paper 1: (For
Class 11 and 12 and
Pre-Medical/Engineering Entrance)
Answers
1. n1 is the frequency of the series limit of Lyman series,
n2 is the frequency of the first line of Lyman series and
n3 is the frequency of the series limit of the Balmer
series. Then ______.
(A)
(B)
(C) n1 - n2 = n3
(D) n1 = n2 - n3
Answer:
(C)
2. Two beams of red and violet colours are made to pass
separately through a prism of A = 60°. In the minimum
deviation position, the angle of refraction inside the
prism will be
(A) greater for violet colour
(B) 30° for both the colours
(C) greater for red colour
(D) equal but not 30° for both the colours
Answer:
(B)
3. 92U235 undergoes successive disintegrations with the
end product of 82Pb203. The Number of a and b
particles emitted are
(A) a = 6, b = 4
(B) a = 6, b = 0
(C) a = 8, b = 6
(D) a = 3, b = 3
Answer:
(C)
4. A bat flies at a steady speed of 4 ms-1 emitting a
sound of f = 90 ´ 103 Hz. It is flying horizontally
towards a vertical wall. The frequency of the reflected
sound as detected by the bat will be _____.
(Take velocity of sound in air as 330 ms-1).
(A) 92.1 ´ 103 Hz
(B) 89.1 ´ 103 Hz
(C) 88.1 ´ 103 Hz
(D) 87.1 ´ 103 Hz
Answer:
(A)
5. A battery of e.m.f. E has an internal resistance 'r'. A
variable resistance R is connected to the terminals of
the battery. A current I is drawn from the battery. V is
the terminal P.D. lf R alone is gradually reduced to
zero, which of the following best describes I and V?
(A) I approaches E / r, V approaches E
(B) I approaches infinity, V approaches E
(C) I approaches zero, V approaches E
(D) I approaches E / r, V approaches zero
Answer:
(D)
6. A boat has green light of wavelength l = 500 nm on
the mast. What wavelength would be measured and
Answer:
(C)
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2. what colour would be observed for this light as seen by
a diver submerged in water by the side of the boat?
Given nw = 4/3.
(A) Green of wavelength 500 nm
(B) Blue of wavelength 376 nm
(C) Green of wavelength 376 nm
(D) Red of wavelength 665 nm
7. A body is projected vertically upwards. The times
corresponding to height h while ascending and while
descending are t1 and t2 respectively. Then the
velocity of projection is (g is acceleration due to
gravity)
(A)
(B)
(C)
(D)
Answer:
(D)
8. A body of mass 4 kg is accelerated upon by a constant
force, travels a distance of 5 m in the first second and
a distance of 2 m in the third second. The force acting
on the body is
(A) 2 N
(B) 4 N
(C) 6N
(D) 8N
Answer:
(C)
9. A body weighs 50 grams in air and 40 grams in water.
How much would it weigh in a liquid of specific gravity
1.5?
(A) 30 grams
(B) 35 grams
(C) 65 grams
(D) 45 grams
Answer:
(B)
10. A capacitor and an inductance coil are connected in
separate AC circuits with a bulb glowing in both the
circuits. The bulb glows more brightly when ______.
(A) separation between the plates of the capacitor is
increased.
(B) a dielectric is introduced into the gap between the
plates of the capacitor.
(C) an iron rod is introduced into the inductance coil.
(D) the number of turns in the inductance coil is
increased.
Answer:
(B)
11. A bar magnet is equivalent to _______.
(A) solenoid carrying current
(B) circular coil carrying current
(C) toroid carrying current
(D) straight conductor carrying current
Answer:
(A)
12. A beam of light of wavelength 600 nm from a distant
source falls on a single slit 1mm wide and the resulting
diffraction pattern is observed on a screen 2m away.
The distance between the first dark fringes on either
side of the central bright fringe is _______.
(A) 1.2 mm
(B) 1.2 cm
(C) 2.4 cm
(D) 2.4 mm
Answer:
(D)
13. A beam of parallel rays is brought to a focus by a
plano-convex lens. A thin concave lens of the same
focal length is joined to the first lens. The effect of this
is _______.
Answer:
(C)
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3. (A) the focal point shifts away from the lens by a small
distance.
(B) the focus remains undisturbed. T
(C) the focus shifts to infinity.
(D) the focal point shifts towards the lens by a small
distance.
14. A biconvex lens has a radius of curvature of magnitude
20 cm. Which one of the following options describe
best the image formed of an object of height 2 cm
placed 30 cm from the lens?
(A) Real, inverted, height = 1 cm
(B) Virtual, upright, height = 1 cm
(C) Virtual, upright, height = 0.5 cm
(D) Real, inverted, height = 4 cm
Answer:
(D)
15. A body of mass 5 kg is thrown vertically up with a
kinetic energy of 490 J. The height at which the kinetic
energy of the body becomes half of the original value
is ______.
(A) 12.5 m
(B) 10 m
(C) 2.5 m
(D) 5 m
Answer:
(D)
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