Question # 1

During the projectile motion, the horizontal component of velocity

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changes with time

remains constant

becomes zero

decreases with time

Op-amp has been discussed as comparator of:

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Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

Dimension of mass is written as:

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M

[M]

(M)

[m]

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

When a mass 'm' is pulled slowly, the spring stretches by an amount x₀,then the average force would be

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F= Kx₀

F=1/2Kx₀

F=2Kx₀

F=4Kx₀

Distance covered by a freely failing body n the first second of its motion will be:

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4.9 m

9.8 m

19.6 m

29.4 m

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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2

1

0.5

1.5

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

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photo diode

light emitting diode

photo voltaic cell

none of these

A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be:

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49 rad/sec²

1 rad/sec²

0.16 rev/sec²

Both A and C

Both B and C

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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Wavelength

Frequency

Energy

Temperature

All of these

The magnifying power of an instrument is expressed in

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Radians

Degrees

No units

None of these

The curie temperature of iron is called

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250°C

500°C

750°C

1000°C

When milk is churned,cream separates because of

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Gravitational force

Centrifugal force

Frictional force

None of these

Moment of inertia of an object does not depend upon

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Mass of object

Mass distribution

Angular velocity

Axis of rotation

In relation Vt = 2gr²ρ/9η. Terminal velocity is directly proportional to

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r

r²

r³

None of these

A unit vector may be defined by the

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Surface

Direction by normal drawn vector

Along the direction of surface

a and b

At the highest point, we can claim that:

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Resultant velocity is zero

Only horizontal component of velocity is zero

Only V_yis zero

Nothing of above

The linear momentum of the body is defined as

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p=ma

p=1/2ma

P= mv

p=1/2mv

A ball is thrown with a speed of 30 ms^-1_{in a direction of 30}° with the ground. What will be its time of flight?

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3.1 s

1.55 s

0.31 s

15.5 s

A chocolate cookie is a circular disk of diameter 8.5 ± 0.02 cm and thicknes 0.050 ± 0.005 cm the average volume in cm³ is

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2.83 ± 0.3

2.38 ± 0.27

11.35 ± 1.2

9.31 ± 1.12

A ballistic missile is

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Unpowered

Unguided

Both

None of these

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