Q- Calculate the speed of light in water if the refractive index of water is 1.33(a) 4 x 108 m/s
(b) 2.25 x 108 m/s
(c) 1.33 x 108 m/s
(d) 3 x 108 m/s
Answer: (b) 2.25 x 108 m/s
Q- What is hypermetropia?
(a) Bad vision due to age
(b) Short-sightedness
(c) Long-sightedness
(d) Formation of a layer on the eye
Answer: (c) Long-sightedness
Q- Rainbow is an example of which phenomenon?
(a) Refraction and scattering
(b) Refraction and total internal reflection
(c) Dispersion and reflection
(d) Dispersion and total internal reflection
Answer: (d) Dispersion and total internal reflection
Q- Which of the following is the combination that is used in the formation of achromatic lenses?
(a) 1 convex and 1 plane mirror
(b) 2 convex lenses
(c) 1 convex and 1 concave lens
(d) 2 concave lenses
Answer: (c) 1 convex and 1 concave lens
Q- How does magnifying power change for an objective lens if the focal length of the objective lens is increased?
(a) The microscope will decrease but for the telescope, it will increase
(b) The microscope will increase but for the telescope, it decreases
(c) The microscope and telescope will increase
(d) The microscope and telescope will decrease
Answer: (a) The microscope will decrease but for the telescope, it will increase
Q- What is the magnification produced by the plane mirror?
(a) Zero
(b) +1
(c) -1
(d) Between 0 and +∞
Answer: (b) +1
Q- What happens to the refractive index on heating the liquid?
(a) Increases
(b) Decreases
(c) Remains unchanged
(d) Increases or decreases depending on the rate of heating
Answer: (b) Decreases
Q- Calculate the velocity of the light ray in the medium, if the critical angle for TIR from medium to the vacuum is 30°.
(a) 2 x 108 m/s
(b) 1.5 x 108 m/s
(c) 0.75 x 108 m/s
(d) 3 x 108 m/s
Answer: (b) 1.5 x 108 m/s
Q- Calculate the velocity of the light ray in the medium, if the critical angle for TIR from medium to the vacuum is 30°.
(a) 2 x 108 m/s
(b) 1.5 x 108 m/s
(c) 0.75 x 108 m/s
(d) 3 x 108 m/s
Answer: (b) 1.5 x 108 m/s
Q- Following is the graph which represents the thermo EMF of two different metals which are joined end to end. One end of the metal is kept at a constant temperature while the other end is heated at very high temperature.
Answer: (d)
Q- Select the graph which depicts the variation in thermoelectric power and the temperature difference between the hot and cold junction in the thermocouples
Answer: (a)
Q- Which of the following represents the relationship between the current flowing, i through the electric heater and the time taken, it.
Answer: (b)
Q- Consider three voltmeters A, B, and C with resistance R, 1.5R, and 3R respectively. Potential difference is applied across the points X and Y, the voltmeter readings are VA, VB, and VC.
(a) VA = VB ≠ VC
(b) VA ≠ VB ≠ VC
(c) VA = VB = VC
(d) VA ≠ VB = VC
Answer: (c) VA = VB = VC
Q- What is the ratio of power dissipated if two electric bulbs are connected in series and the ratio of their resistance is 1:2?
(a) 1:4
(b) 1:2
(c) 2:1
(d) 1: 1
Answer: (b) 1:2
Q- What is the principle behind thermocouple
(a) Joule effect
(b) Thomson effect
(c) Seebeck effect
(d) Peltier effect
Answer: (c) Seebeck effect
Q- What does the internal resistance of a cell mean?
(a) The resistance of the material used in the cell
(b) The vessel of the cell
(c) The electrodes of the cell
(d) The electrolyte used in the cell
Answer: (d) The electrolyte used in the cell
Q- A potentiometer is considered a versatile and accurate device to make an electrical measurement of EMF. Why?
(a) Because the method involves a combination
(b) There are cells involved
(c) Because of potential gradients
(d) As there is no flow of current through the galvanometer
Answer: (d) As there is no flow of current through the galvanometer
Q- Consider copper and aluminium wire whose length and resistance are the same. Also, the specific resistance of aluminium is more than copper. Select the correct statement
(a) Copper and aluminium mass are the same
(b) Copper wire has more mass than the aluminium wire
(c) Copper wire has less mass than the aluminium wire
(d) The information given is incomplete
Answer: (d) The information given is incomplete
