Question # 1

Maximum height of a bullet when fixed at 30 with horizontal is 11 m. Then height when it is fired at 60° is

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22 m

6 m

33 m

7.8 m

If every particle of the flow that passes a particular point, moves along the same path as followed by particles which passed the point earlier, then this flow is said to be

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turbulent

streamline

abrupt

none of them

Electromagnetic -radiation means:

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Photons

protons

Electrons

Mesons

None of these

Transformer is used to

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Increase alternating current

Increase d.c voltage

Increase & Decrease emf

All answers are right

As the bob of the pendulum moves to and fro which of the force is experienced by the bob

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its weight

tension in the string

viscous drag force by air

all of them

Referring to above figure, current in coil P falls from its maximum value to zero:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

Wave disturbances may also come in a concentrated bundle, like shock wave from an aeroplane flying at

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subsonic speed

sonic speed

super sonic speed

any one of them

If the velocity time graph is a straight line parallel to time-axis, then it means that:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of above

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

Both A, B

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

An average energy used by the car-from petrol in its life time

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1 × 10⁹ J

1 × 10¹⁰ J

1 × 10¹¹ J

1 × 10¹² J

Fire optics has ability to transmit

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Thousand telephone conversation

Several television programs

Numerous data signals between stations

All of these

When the left is moving upwards with an acceleration 'a' then

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T - W = ma

W - T = ma

T = W

None of these

A motorcycle driver double its velocity when he is having a turn.The force exerted outwardly will by

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Double

Half

4 times

1/4 time

A total charge of 100C flows through 12W bulb in a time of 50 second. Which is the potential difference across the bulb during this time?

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0.12V

6.0V

2.0V

24V

For a normal AC cycle, during T/2 to T the diode act as:

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Open switch

full wave rectifier

Close switch

All are correct

The torque is maximum when the angle between F and r is

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0^o

90^o

180^o

275^o

Torque producing clockwise rotation is taken as

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negative

positive

zero

both negative and positive

Torque acting on a body determines its

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inertia

linear acceleration

angular acceleration

angular velocity

The linear acceleration of the particle of mass m describing a horizontal circle of radius r with angular speed ω is

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rω

ω/r

rω²

r²ω

Hails fall faster than rain drops due to their

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Greater size

Greater mass

Greater area

None of these

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