26. The image formed by a plane mirror is always :
- Virtual & inverted
- real & inverted
- Virtual and the same size
- real and of the same size
27. The minimum distance between the source and the reflector, so that an echo is heard is approximately equal; to (velocity of sound in air
332 m/s) :
28. A constant force acts on
two particles of masses
4kg and
16 kg during which both of them travel a distance of s meter. Both particles were initially at rest and they started off at the same time. The ratios of the speeds attained by them are :
29. If the acceleration due to gravity
g, is about
10 m/s^{2} near the surface of the earth, then at the center of the earth
g would have an approximate value of :
- Zero
- 5m/s^{2}
- 10m/s^{2}
- 20m/s^{2}
30. In the case of a prism, the angle of deviation is greater for :
31.
Two resistances are joined in parallel whose resultant is
6/5 Ω. One of the resistance wires is broken and the effective resistance becomes
2 Ω. The resistance in ohm of the wire that got broken is :
32. The molar gas constant is the same for all gases because, at the same pressure and temperature, equal volumes of all gases have the same :
- Mass
- Average kinetic energy
- Number of molecules
- Density
33. If the object is placed at
2f from a convex lens, then :
- A real image is formed at 2f on the other side.
- A real inverted image is formed at 2f on the other side.
- A real image is formed at infinity.
- A real inverted image is formed between f and 2f on the other side.
34. Which one of the following instrument can be regarded as non-ohmic resistance :
- A piece of copper wire
- Ammeter
- Diode valve
- Voltmeter
35. Among the moving particles (
α, β, γ particle), which one or which ones are not deflected by the magnetic field?
- α and β-particle
- β and γ-particle
- α and γ-particle
- γ-particle
36. An object is placed in front of two plane mirrors which are perpendicular to each other. The number of images that can be seen by an observer is :
37.
540 gm of ice at
0°C mixed with
540 gm of water at
80°C. The final temperature of the mixer is :
38. Three resistances each of
4 ohms are connected to form an equilateral triangle. The equivalent resistance between any
two corners is :
- 12 ohm
- 8 ohm
- 3/8 ohm
- 8/3 ohm
39.
_{92}U
^{235},
_{92}U
^{238}differ as :
- _{92}U^{235 }has 3protons less
- _{92}U^{238 }has 3 electrons more
- _{92}U^{235 }has 3 neutrons less
- _{92}U^{238} has 3 protons more
40. Two bulbs when connected in parallel to a source, take
60 W each, The total power consumed when they are connected in series with the same source is :
41. A train moving with a speed of
36 km/hr takes
14 sec to cross a bridge of length
100m. The length of the train is :
42. The rate of radioactive disintegration increases :
- With the increase in temperature
- With the increase in pressure
- With the increase in the magnetic field
- None of these.
43. In a nuclear reactor for control rod we use :
- Carbon
- Heavy water
- Lithium
- Cadmium
44. The freezing point on a thermometer is marked
30° and the boiling point is marked as
180°. The reading of the thermometer at
50°C is :
45. The densities of two substances are the ratio
2:3 and their specific heats are in the ratio
4:3. Their thermal capacities per unit volume are in the ratio :
46. At what common temperature a wooden block and a metallic block would be felt equally cold or equally hot when touched?
- At any temperature
- If both the blocks are at 0°C
- If the temperature of both the blocks equal the temperature of the person touching them
- None of these
47. Two resistance
1 Ω and
3 Ω are connected parallel and the combination is connected to a
2-volt source. The ratio of electric current through the resistance will be :
48. Two plane mirrors are inclined to each other at an angle
θ. A ray of light is reflected first in one mirror and then at the other. The total deviation of the ray is :
- 2θ
- 240°-2θ
- 360°-2θ
- 180°-2θ
49. The ideal gas equation for
1 mole of ideal gas is
PV=RT, the SI unit of universal gas constant
R is :
- cal gm^{-10} C^{-1}
- J mol^{-1} K^{-1}
- J kg^{-1} K^{-1}
- None of these
50. At
STP amoung 32 gm of
SO_{2}, 22 gm of
CO_{2} and 17 gm of
H_{2}O gas :
- SO^{2} gas has the maximum number of molecules
- CO^{2} gas has the maximum volume
- All gases have an equal number of molecules
- None of these
Source: Oriental MCQ (2018)
Author: Abhinandan Singh
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