Physics

105 questions in Science & Technology.

Asked in 1999, 1998, 1997, 1996, 1995

1999 · Q145 Science & TechnologyPhysicseasy

A hunter aims his gun at a point between the eyebrows of a monkey sitting on a branch of a tree. Just as he fires, the monkey jumps down. The bullet will

(a)hit the monkey at the point aimed
(b)hit the monkey below the point aimed
(c)hit the monkey above the point aimed
(d)miss the monkey altogether

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Official answer(a) hit the monkey at the point aimed

1998 · Q108 Science & TechnologyPhysicseasy

A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?

(a)It is connected in parallel with the main switch
(b)It is made mainly from silver alloys
(c)It must have a low melting point
(d)It must have a very high resistance

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Official answer(c) It must have a low melting point

1998 · Q114 Science & TechnologyPhysicseasy

A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s². What will be its velocity after 3 seconds?

(a)9.8 m/s
(b)19.6 m/s
(c)29.4 m/s
(d)39.2 m/s

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Official answer(c) 29.4 m/s

1998 · Q128 Science & TechnologyPhysicsmoderate

Assertion (A): The temperature of a metal wire rises when an electric current is passed through it. Reason (R): Collision of metal atoms with each other releases heat energy.

(a)Both A and R are true, and R is the correct explanation of A
(b)Both A and R are true, but R is NOT a correct explanation of A
(c)A is true, but R is false
(d)A is false, but R is true

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Official answer(c) A is true, but R is false

1997 · Q106 Science & TechnologyPhysicseasy

The tendency of a liquid drop to contract and occupy minimum area is due to

(a)viscosity
(b)surface tension
(c)density
(d)vapour pressure

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Official answer(b) surface tension

1997 · Q107 Science & TechnologyPhysicseasy

Which one of the following is a vector quantity?

(a)Momentum
(b)Pressure
(c)Energy
(d)Work

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Official answer(a) Momentum

1997 · Q109 Science & TechnologyPhysicsmoderate

Which one of the following is a valid conclusion?

(a)The larger the initial inclination, the longer the throw
(b)The larger the height reached, the longer the throw
(c)The larger the height reached, the shorter the throw
(d)The larger the initial inclination, the greater the height reached

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Official answer(c) The larger the height reached, the shorter the throw

1997 · Q110 Science & TechnologyPhysicseasy

The working principle of a washing machine is

(a)centrifugation
(b)dialysis
(c)reverse osmosis
(d)diffusion

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Official answer(a) centrifugation

1997 · Q134 Science & TechnologyPhysicseasy

A smooth inclined plane is inclined at an angle θ with the horizontal as shown in the figure. A body starts from rest and slides down the inclined surface. The time taken by the body to reach the bottom is

(a)(2h / g)
(b)(2l / g)
(c)(2l / (g sin θ))
(d)(1/ sin θ) (h / 2g)

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Official answer(c) (2l / (g sin θ))

1997 · Q144 Science & TechnologyPhysicseasy

A girl is swinging on a swing in sitting position. When the same girl stands up, the period of swing will

(a)be shorter
(b)be longer
(c)depend on the height of the girl
(d)not change

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Official answer(a) be shorter

1997 · Q147 Science & TechnologyPhysicsmoderate

A boat which has a speed of 5 km/hr in still water crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water in km/hr is

(a)1
(b)3
(c)4
(d)41

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Official answer(b) 3

1996 · Q114 Science & TechnologyPhysicsmoderate

I. ‘A’ stood first in the race. II. ‘C’ led all the way. III. ‘D’ ran faster than others in the later part of the race. Of these statements

(a)I and III are false and II is true
(b)I and II are false and III is true
(c)I and III are true and II is false
(d)I is true and II and III are false

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Official answer(b) I and II are false and III is true

1996 · Q115 Science & TechnologyPhysicseasy

When an air bubble at the bottom of a lake rises to the top, it will

(a)increase in size
(b)decrease in size
(c)maintain its size
(d)flatten into a disk-like shape

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Official answer(a) increase in size

1996 · Q116 Science & TechnologyPhysicseasy

When a mirror is rotated by an angle of θ, the reflected ray will rotate by

(a)0°
(b)θ / 2
(c)θ
(d)2θ

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Official answer(d) 2θ

1996 · Q117 Science & TechnologyPhysicsmoderate

A truck, a car and a motor cycle have equal kinetic energies. If equal stopping ...

(a)x > y > z
(b)x < y < z
(c)x = y = z
(d)x 4y 8z

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Official answer(a) x > y > z

1996 · Q118 Science & TechnologyPhysicsmoderate

A liquid is flowing in a streamlined manner through a cylindrical pipe. Along a section containing the axis of the pipe, the flow profile will be

(a)as shown in figure (a)
(b)as shown in figure (b)
(c)as shown in figure (c)
(d)as shown in figure (d)

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Official answer(d) as shown in figure (d)

1996 · Q119 Science & TechnologyPhysicseasy

The variation of displacement (d) with time (t) in the case of a particle falling freely under gravity from rest is correctly represented by which of the following graphs?

(a)graph (a)
(b)graph (b)
(c)graph (c)
(d)graph (d)

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Official answer(a) graph (a)

1996 · Q120 Science & TechnologyPhysicseasy

Total internal reflection can take place when light travels from

(a)diamond to glass
(b)water to glass
(c)air to water
(d)air to glass

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Official answer(a) diamond to glass

1996 · Q121 Science & TechnologyPhysicsmoderate

Assertion (A): Transformer is useful for stepping up or stepping down voltages. Reason (R): Transformer is a device used in D.C. circuits. In the context of the above two statements, which one of the following is correct?

(a)Both A and R are true and R is the correct explanation of A.
(b)Both A and R are true but R is not a correct explanation of A.
(c)A is true but R is false.
(d)A is false but R is true.

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Official answer(c) A is true but R is false.

1996 · Q122 Science & TechnologyPhysicseasy

Domestic electrical wiring is basically a

(a)series connection
(b)parallel connection
(c)combination of series and parallel connections
(d)series connection within each room and parallel connection elsewhere

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Official answer(b) parallel connection

1996 · Q124 Science & TechnologyPhysicseasy

A simple machine helps a person doing

(a)less work.
(b)the same amount of work with lesser force.
(c)the same amount of work.
(d)the same amount of work much faster.

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Official answer(b) the same amount of work with lesser force.

1996 · Q127 Science & TechnologyPhysicseasy

The alpha particle carries two positive charges. Its mass is very nearly equal to that of

(a)two protons
(b)an atom of helium
(c)sum of masses of two positrons and two neutrons
(d)two positrons as each positron carries a single positive charge

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Official answer(b) an atom of helium

1995 · Q105 Science & TechnologyPhysicsmoderate

105. A parachutist jumps from a height of 5000 metres. The relationship between his falling speed ‘v’ and the distance fallen through ‘d’ is best represented as (four graphs labelled a, b, c, d).

(a)Graph (a)
(b)Graph (b)
(c)Graph (c)
(d)Graph (d)

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Official answer(b) Graph (b)

1995 · Q106 Science & TechnologyPhysicseasy

106. Which one of the following can be used to confirm whether drinking water contains a gamma-emitting isotope or not?

(a)Microscope
(b)Lead plate
(c)Scintillation counter
(d)Spectrophotometer

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Official answer(c) Scintillation counter

1995 · Q107 Science & TechnologyPhysicseasy

107. The normal temperature of human body on the Kelvin scale is

(a)280
(b)290
(c)300
(d)310

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Official answer(d) 310