NCST Mock Test Season II Physics
NCST Mock Test Season II Physics
1] An object is placed at a distance x from the principal focus of a mirror of focal length f. What will be the magnification of the image?
A. x/fB. f/x
C. (x+f)/x
D. (x-f)/x
2] An equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in figure. Let, f,f', f" be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively. Choose the correct statement from the following.
A. f' = f, f" = 2f
B. f' = 2f, f" = f
C. f' = f, f" = f
D. f' = 2f, f" = 2f
3] A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/5 of the angle of the prism. The angle of deviation is
A. 45°B. 39°
C. 20°
D. 12°
4] (Observe the image). If image formed by both mirror coincide, then, what is the focal length of convex mirror?
A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm
5] The sky appears blue in colour because of
A. Dispersion of lightB. Total Internal Reflection
C. Scattering of light
D. Reflection of light
6] Two plane mirrors are at 45° to each other. If an object is placed between them then, the number of images will be
A. 5B. 9
C. 7
D. 8
7] If a convex lens of focal length 100 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power.
A. +6.5 DB. -6.5 D
C. +7.5 D
D. -1 D
8] A diminished virtual image can be formed only in
A. Plane mirrorB. Concave mirror
C. Convex mirror
D. None of these
9] A Point object is placed at a distance of 10 cm and its real image is formed at a distance of 30 cm from a concave mirror. If the object is moved by 0.2 cm towards the mirror, the image will shift by about
A. 1.8 cm away from the mirrorB. 0.4 cm towards the mirror
C. 0.8 cm away from the mirror
D. 0.8 cm towards the mirror
10] Magnetic field at point 'P' due to given current distribution is
A. (μI)/(4πa)
B. (μI)/(2πa)
C. (μI)/(πa)
D. 0
11] A charged particle is projected from A in uniform magnetic field as shown in figure. The magnitude of velocities at point A, B and C respectively during the motion is:
A. Maximum at A and C
B. Maximum at B
C. Minimum at A and C
D. Equal at A, B and C
12] A particle of mass m, charge q and Kinetic energy K enters in a transverse uniform magnetic field of induction B at t = 0. After 10 seconds the kinetic energy of the particle will be
A. KB. 4 K
C. 5 K
D. 10 K
13] P and Q are two concentric circular loop carrying current i1 and i2 as shown in the figure. If the ratio of their radii is 2:3 and ratio of the magnetic field at the center O due to P and Q is 3:4, then the value of i1/i2 will be
A. 1/2
B. 1/3
C. 1/4
D. 1/6
14] Following is equilateral triangle shape loop, whose one arm produces magnetic field B at the centre. The resultant magnetic field due to all the arms will be
A. 4 B
B. B/2
C. 0
D. 3 B
15] Bulbs B1, B2 and B3 have rated power 100 W, 100 W and 200 W respectively and rated voltage as 200 V each. If, the applied voltage is 240 V then, find power of the circuit.
A. 400 W
B. 200 W
C. 240 W
D. 440 W
16] A conductor with rectangular cross section has dimensions (a x 2a x 4a) as shown in the figure. Resistance across AB is x, across CD is y and across EF is z. Then, ratio of x:y:z is
A. 16 : 4 : 1
B. 16 : 1 : 4
C. 1 : 1 : 1
D. 4 : 16 : 1
17] Find Potential Difference between point A and B.
A. 3.5 V
B. 3 V
C. 4 V
D. 5 V
18] Arrange the circuits in decreasing order of power dissipation (resistances are of same values).
A. I > III > II
B. III > II > I
C. I > II > III
D. II > III > I
19] The power dissipated in the circuit shown in the figure is 25 Watts. The value of R is
A. 10 Ω
B. 30 Ω
C. 20 Ω
D. 15 Ω
20] Calculate the energy emitted by a bulb of 100 W in 1 hour.
A. 100 JB. 1000 J
C. 3.6 × 105 J
D. 6000 J
21] The value of current i for the given circuit is
A. 10 A
B. 6 A
C. 4.5 A
D. 20 A
22] If voltage across a bulb rated 220 volts, 100 watts drops by 5% of its rated value, the percentage of the rated value by which the power would decrease is
A. 5%B. 10%
C. 20%
D. 2.5%
23] If Power dissipated in the 9 Ω resistor in the circuit shown is 36 W, the potential difference across the 3 Ω resistor is
A. 4 V
B. 8 V
C. 10 V
D. 15 V
24] A current of 4 A flows through a 2 Ω resistor when connected across a battery. The same battery supplies a current of 1 A when connected across a 9 Ω resistor. The internal resistance of the battery is
A. 0.5 ΩB. (1/3) Ω
C. (1/4) Ω
D. 1 Ω
25] In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will
A. flow from A to B
B. flow in the direction which will be decided by the value of V
C. be zero
D. flow from B to A
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