# MCAT/MCAT Physics Mcq Questions Optical instruments Sample Test,Sample questions

1.zero

2.f / 2

3.2f

4.infinite

## Question: `A convex lens acts as a diverging lens if the`

1.object is beyond C

2.if the object is with in C

3.if the object is within f

4.both (b) and (c)

## Question: `A convex lens gives a virtual image only when the objects lies`

1.between principal focus and center of curvature

2.beyond 2 f

3.at the principal focus

4.between principal focus and optical center

1.f2 + f1

2.f2 - f1

3.f1f2/f2+f1

4.f1f2/f1-f2

## Question: `A lens which converges a beam of parallel rays to a point is called`

1.diverging (or concave) lens

2.converging (or convex) lens

3.plano concave lens

4.plano convex lens

## Question: `A lens, which is thicker at the center and thinner at the edges is called`

1.concave lens

2.convex lens

3.plano convex lens

4.plano concave lens

## Question: `A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called`

1.center of curvature

2.focus

3.optical center

4.aperture

## Question: `A spectrometer is used to find`

1.wave length of light

2.refractive index of the prism

3.wavelength of different colours

4.all of the above

## Question: `A wire having very high value of conductance is said to be`

1.very good conductor

2.moderately good conductor

3.an insulator

4.no specific criterion available

## Question: `A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part`

1.remains the same

2.is doubled

3.is halved

4.becomes zero

1.0?

2.45?

3.90?

4.180?

1.10 dioptre

2.10 dioptre

3.1 / 10 dioptre

4.1 / 10 dioptre

## Question: `Dispersional effect may produce error in light signals. This type of error`

1.single mode step index fibre

2.multimode step index fibre

4.monomode step index fiber

## Question: `Errors in the transmission of power through optic fiber can be minimized by using a`

1.Multimode index fiber

3.Single mode step index fiber

4.Copper wire

## Question: `Final image produced by a compound microscope is`

1.real and inverted

2.real and erect

3.virtual and erect

4.virtual and inverted

1.fo + fe

2.fo - fe

3.fo / fe

4.fe / fo

1.144000J

2.144J

3.1.44J

4.14J

1.f

2.f/2

3.2f

4.3f/2

## Question: `If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from`

1.chromatic aberration

2.spherical aberration

3.both spherical and chromatic

4.distortion

## Question: `If an object is placed away from 2f of a converging lens then the image will be`

1.real and erect

2.virtual and erect

3.real and inverted

4.virtual

1.0.5

2.0.2

3.1

4.2

## Question: `In going form a denser to rarer medium a ray of light is`

1.undeviated

2.bent away form the normal

3.bent towards the normal

4.polarized

## Question: `In multimode step index fibre the refractive index of core and cladding is`

1.same

2.different

3.zero

4.different with refractive index of core higher than cladding

1.Diodes

2.Repeaters

3.Laser

4.Transformer

1.300km

2.200km

3.100km

4.20km

## Question: `Least distance of distinct vision`

1.increases with increase in age

2.decreases with increase in age

3.neither increases nor decreases

4.becomes infinite after 60 years

## Question: `Light signals passes through multimode graded index fibre due to`

1.continuous refraction

2.total internal reflection

3.both continuous refraction and total internal reflection

4.diffraction

1.fo+fe

2.fo/fe

3.fe/fo

4.(1+fo/fe)L/fo

## Question: `Magnifying power of simple microscope`

1.increase with increase in focal length

2.increase with decrease in focal length

3.no effect with decrease or increase with focal length

4.list distance of distinct vision

1.spectrometer

2.galvanometer

3.interferometer

4.none of these

1.C = 4fd

2.C = 8fd

3.C = 16fd

4.C = 5/2fd

1.one second

2.one day

3.one minute

4.one hour

## Question: `Production of heat due to an electric current flowing through a conductor is given by`

1.Joule effect

2.Joule Thomsons effect

3.Comptons effect

4.Feed back effect

## Question: `Resistance of a conductor depends upon`

1.nature of conductor

2.dimension of conductor

3.physical state of the conductor

4.all of above

## Question: `The current through a metallic conductor is due to the motion of`

1.free electrons

2.protons

3.neutrons

4.still under controversy

1.focal length

2.principal axis

3.aperture

## Question: `The electrical signals change into light signals for transmission through optical fibre. A light pulse represent`

1.zero (0)

2.One (1)

3.both zero (0) and one (1)

4.neither zero (0) nor one (1)

1.Newton

2.Einstein

3.Raleigh

4.Planks

## Question: `The function of collimeter in spectrometer is`

1.to produce parallel beams of light

2.to filter the light rays

3.to make them

4.no function

1.15 cm

2.25 cm

3.30 cm

4.40 cm

1.2 f

2.2.5 f

3.3f

4.4f

1.real

2.virtual

3.positive

4.negative

1.42?

2.47?

3.52?

4.50?

## Question: `There is no noticeable boundary between core and cladding`

1.multi mode step index fibre

3.single mode step index fibre

4.all types of fibre

## Question: `Thermocouples convert`

1.heat energy into electrical energy

2.heat energy into light energy

3.heat energy into mechanical energy

4.mechanical energy into heat energy

1.40 W

2.90W

3.100W

4.120W

1.zero

2.focus

3.2 f

4.f/2

1.meter

2.watt

3.dioptre

4.horsepower

## Question: `When same current passes for same time through a thick and thin wire`

1.more heat is produced in thick wire

2.more heat is produced in thin wire

3.no heat is produced in wire

4.less heat is produced in thick wire

## Question: `Which one type of fibre is more suitable for transmission of signals in which white light is used ?`

1.mono mode step index fibre

2.multi mode step index fibre