Question # 1

A train of 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot files at a speed of 5 ms^-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

A person starts his journey from a point 0, travels 4 Km SW, then 4 Km NW, and finally 4 Km north-east. At what distance is he now from point 0?

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0 Km

4 Km

8 Km

12 Km

In a transistor, if the central region is n-type, then this type of transistor is known as

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n-p-n transistor

p-n-p transistor

either of these

none of these

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

At high speed, fluid friction _____ and fuel consumption ___,:

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Increases, decreases

Increases, increases

Decreases, increases

None of these

A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after

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10 s

20 s

5 s

40 s

A dirty carpet is to be cleaned by heating. This is in according with______law of motion.

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First

Second

Third

None of these

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

The output voltage of half wave rectification is in the form of

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a smooth curve

a smooth wave

pulses

all of the above

Truth table of logic function:

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Summarizes its output values

Tabulates all its input conditions only

Display all its input/output possibilites

Is not based on logic algebra

None of these

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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thermoionic electrons

free electrons

photoelectrons

slow electrons

Light of wavelength 800 n m is incident on a pair of slits, forming fringes 4.0 mm apart on a screen. What is the fringe when light of 400 nm is used and the slit separation is halved?

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2.0 mm

1.0 mm

4.0 mm

0.5 mm

The conductivities of conductors (metals) have

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10⁵ (Ω)^-1

10⁷ (Ωm)^-1

10⁸ (Ωm)^-1

10⁹ (Ωm)^-1

The moment of linear momentum is called

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Impulse

Torque

Angular momentum

Couple

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre,then the potential at a point distance 15 cm from the centre will be

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1/3 V

2/3 V

3/2 V

3 V

A body is dropped from a tower with zero velocity reaches ground in 4 seconds.The height of tower is about

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80 m

20 m

160 m

40 m

The curie temperature of iron is

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600 C^o

650 C^o

700 C^o

750 C^o

The process of liquefaction and evaporation of a substance performed slowly are

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Reversible

Practically reversible

Not reversible

None of these

When the car moves with increasing acceleration, the velocity time graph is a

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Straight line

Horizontal straight line

Curve

None of these

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

Indicate which pair of physical quantities given below has not the same units and dimensions?

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Momentum and impulse

Torque and angular momentum

Acceleration and gravitational field strength

Pressure and modulus of elasticity

Vector A lies in XY plane. For what orientation with both of its rectangular components be negative ?

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I-quadrant

II-quadrant

III-quadrant

None of these

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