Signature of invigilator ____________
PART TEST-1
Class : XII & XIII (All)
Time : 1 Hr. Max. Marks : 90
PHYSICS
INSTRUCTIONS
1. The question paper contains 30 questions. All Questions carry 3 marks each. All of them are compulsory.
2. Each question contains four alternatives out of which ONE or MORE THAN ONE is(are) correct.
3. There is NEGATIVE marking. For each wrong answer 1 mark will be deducted.
4. Indicate the correct answer for each question by filling appropriate bubble in your answer sheet.
5. Use only HB pencil for darkening the bubble.
6. Use of Calculator, Log Table, Slide Rule and Mobile is not allowed.
7. The answer(s) of the questions must be marked by shading the circles against the question by dark
HB pencil only.
For example if only 'B' choice is correct then,
the correct method for filling the bubble is
A B C D
the wrong method for filling the bubble are
(i) A B C D
(ii) A B C D
(iii) A B C D
The answer of the questions in wrong or any other manner will be treated as wrong.
Q1. Which of the following pairs have same units?
(A) Specific heat and latent heat
(B) Emissive power and absorptive power
(C) Coefficient of thermal conductivity and thermal coefficient of electric conductivity
(D) Stefan constant and Boltzmann constant
Q2. An instrument for measuring length has minimum main scale reading 0.1 cm. The vernier scale of the
instrument has 100 divisions . The exact length of an object is 10 cm. On measuring, an experimentalist
measures it as 9.900 cm. Which of the following statements are correct?
(A) The pitch of the instrument is 0.1 cm.
(B) The pitch of the instrument is 100.
(C) The least count of the instrument is 0.001 cm
(D) The percentage error in the measurement is 1%.
Q3. Choose the correct statements:
(A) A particle may have varying velocity without having varying speed.
(B) A particle may have varying speed without having varying velocity.
(C) A particle may have non–zero acceleration without having varying speed.
(D) A particle may have non-zero acceleration without having varying velocity.
Q4. Two frames of reference P and Q are moving relative to each other at constant velocity. Let v OP
and a OP represent the velocity and the acceleration respectively of a moving particle O as measured
by an observer in frame P and v OQ and a OQ represent the velocity and the acceleration respectively
of the moving particle O as measured by an observer in frame Q, then
(A) v OP = v OQ (B) v OP = v OQ + v QP
(C) a OP = a OQ (D) a OP = a OQ + a QP
Q5. A block slides down on a frictionless incline making an angle with an elevator floor. The acceleration
of the block relative to the incline is
(A) g sin down the plane, if the elevator descends at constant speed
(B) g sin down the plane, if the elevator ascends at constant speed
(C) g sin down the plane, if the elevator cable breaks
(D) 0, if the elevator cable breaks
ROUGH WORK
Q6. A 5kg block rests on top of a 10 kg block as shown. When a horizontal force of 20 N is applied to the
lower block, they move as one, with no relative sliding. If there is no friction between the floor and the
lower block what is the force of friction between the blocks
20 10
(A) N (B) N
3 3
(C) Data’s are insufficient to decide (D) None of these
Q7. An ice skater gives a sudden push to a sled that sends it sliding away from him. The mass of the skater
and the sled is same. Assume friction to be negligible. Which of the following statements are true?
(A) The force exerted on the sled by the skater is equal in magnitude to the force exerted on the skater
by the sled.
(B) The skater and the sled will accelerate for the same time interval.
(C) The skater and the sled will accelerate for different time intervals.
(D) The velocity of the skater is equal in magnitude to the velocity of the sled after push.
Q8.
A particle of 1 kg moving with initial velocity î 2ˆj m/s is acted upon by a constant force î 2ˆj N.
After 5 seconds,
(A) the velocity is 10m/s (B) the velocity is 6 5 m/s
(C) the distance travelled is
35 5 m (D) the distance travelled is 23.05 m
2
Q9. A particle is at rest when seen from a frame if reference P. Check out the possible options:
(A) The frame P may be inertial but the resultant force on the particle is zero.
(B) The frame P may be non-inertial but the resultant force on the particle is non–zero.
(C) Another inertial frame Q can observe the particle to be moving with a constant velocity in inertial
frame P.
(D) Another non–inertial frame Q can observe the particle to be moving with a constant velocity in non–
inertial frame P.
Q10. The image of an object formed by a convex spherical mirror is
(A) virtual (B) real (C) erect (D) diminished
Q11. With reference to a spherical mirror, which of the following quantities do not depend on whether the rays
are paraxial or not?
(A) Focus (B) Pole (C) Principal axis (D) Radius of Curvature
ROUGH WORK
Q12. A convex lens and a concave lens of a same refractive index are immersed in a medium whose refractive
index is lower than the refractive index of lenses. Then,
(A) the convex lens will behave as a diverging lens.
(B) the convex lens will behave as a converging lens.
(C) the concave lens will behave as a converging lens
(D) the concave lens will behave as a diverging lens
Q13. The angle of deviation in a prism depends on
(A) the angle of incidence (B) the refracting angle of prism
(C) the material of prism (D) the angle of emergence
Q14. Dispersive power of a thin optical medium like prism) does not depend on
(A) the material of prism (B) refracting angle of prism
(C) angle of incidence (D) angle of emergence
Q15. Rainbow is formed
(A) due to two refractions and one internal reflection of light falling on raindrops
(B) due to only reflections of light falling on raindrops
(C) due to two refractions and two internal reflection of light falling on raindrops
(D) none of these are correct
Q16. The image formed of an object on the retina is
(A) real (B) virtual (C) reversed (D) erect
Q17. The dimensions of mutual inductance are
(A) ML2T–2A–2 (B) MLT–2T–2 (C) M2L–1T–2A–1 (D) none
Q18. How many significant figures are there in the numbers 108.023 and 0.19000?
(A) 6 & 5 (B) 6 & 2 (C) 6 & 4 (D) 5 & 3
Q19. The ratio of the atomic radius to nuclear radius is
(A) 104 (B) 10–4 (C) 102 (D) 10–2
Q20.
The resultant of two vectors P Q and P Q is the vector 3P 2 Q 2 . The angle between given
two vectors is
(A) (B) (C) (D) none of these
2 4 3
ROUGH WORK
Q21. An aeroplane flying in the sky with a uniform speed of 200 m/s moves in a vertical circle of radius 400 m.
The mass of the pilot is 70 kg. The force exerted by the pilot on the seat at the highest point of the circle
will be
(A) 3000 N (B) 6300 N (C) 7700 N (D) 630 N
Q22. A frictionless cart A of mass 100 kg carries each other two frictionless small
carts B and C having masses 8 kg and 4 kg respectively connected by a string
passing over a pulley as shown in the figure. What horizontal force F must be
applied on the cart so that smaller carts do not move relative to it?
(A) 150 N (B) 340 N
(C) 560 N (D) 630 N
Q23. The angle of minimum deviation by a prism ( = 1.5) of angle 250 when placed in air is 100. The angle of
4
minimum deviation, when the prism is placed in a liquid of refractive index will be
3
(A) 1.250 (B) 2.50 (C) 3.750 (D) 50
Q24. Two thin plano–convex lenses, each of focal length 40 cm are combined to form a convexo–convex
lens. How far from this lens should an object be placed such that its inverted image of unit magnification
is formed on the other side of the lens?
(A) 80 cm (B) 40 cm (C) 20 cm (D) 102 cm
Q25. A combination of lenses is formed by putting a convex lens and a concave lens, both of 20 cm focal
length, in contact with each other. This combination is used to see an object 5 cm high and situated at 20
cm from the combination. As compared to object, the image will be
(A) erect and smaller (B) erect and of the size of object
(C) inverted and of the size of object (D) inverted and magnified
Q26. Two smaller plano-convex lenses are combined as shown in the figure.
The ratio of their focal lengths will be
(A) 2 : 1 : 1 (B) 1 : 1 : 1 (C) 2 : 1 : 2 (D) 1 : 2 : 2
Q27. The colour of light is determined by its
(A) wavelength (B) frequency (C) velocity (D) amplitude
ROUGH WORK
Q28. A particle starts from rest. Its acceleration (a) versus time (t) as shown in the
figure. The maximum speed of the particle will be
(A) 110m/s (B) 55m/s (C) 550m/s (D) none
Q29. A body weighs 8 kg when placed in one pan and weighs 18 kg when placed in the other pan of a false
balance. If the beam is horizontal when both the pans are empty, the true weight of the body is
(A) 13 kg (B) 12 kg (C) 15.5 kg (D) 15 kg
Q30. A boy sitting on the top most berth in the compartment of train which is just going to stop on a railway
station, drops an apple aiming at the open hand of his brother situated vertically below his hands at a
distance of about 2 meter. The apple will fall
(A) In the hand of his brother
(B) slightly away from the hands of his brother in the direction of motion of the train.
(C) Slightly away from the hands of his brother in the direction opposite to the direction of motion of the
train.
(D) none of the above
ROUGH WORK
