Question # 1

Magnetic effect at a point caused due to flow a current depend upon the

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Quantity of current

Distance from current

Both the quantity of current and distance from current element

None of the all

Suppose the water flows out from a pipe at 3kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, then the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

Total number of base units are

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Three

Five

Seven

Nine

Centripetal acceleration is also called ______ acceleration:

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Tangential

Radial

Angular

None of them

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

The size of the image is maximum when its distance from the magnifying glass is:

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0.10 m

0.15 m

0.20 m

0.25 m

The change of magnetic flux through a circuit will produce

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Magnetic Field

Electric Field

emf

a.c

The consumption of energy by a 60 W bulb in 2 minutes is:

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2 watt-hour

120 watt-hour

30 watt-hour

None of these

Diameter of the nucleus s of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

The life time of metastable state is equal to

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Life time of excited state

Greater than by excited state

Zero

Less than by excited state

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

The solids which have structure in between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

The ratio of nuclear magneton and and Bohr magneton is

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m_e/m_p

m_p/m_e

m_e/m_p

2m_p/m_ez

In young s interference experiment one slit is covered with a cellophane paper which absorbs half the intensity then

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No fringes are observed

All fringes will be darks

bright fringes will be less bright and dark will be less dark

Bright fringes will be brighter and dark fringes will be darks

The speed of swimming of porpoise is

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5 ms^-1

6 ms^-1

8 ms^-1

9 ms^-1

A body moving in a circular path with constant speed has

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Constant acceleration

Constant retardation

Variable acceleration

Variable speed and constant velocity

A box of mass 2 kg is at rest on top of a 0.75m high table. The weight of the object is 19.6 N. if the object is moved so that it falls to the ground, what will be the weight of the object after it has fallen 0.1 metre distance?

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19.2 N

19.6 N

19.8 N

not possible to determine from the given information

The viscosity of water is

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0.019 x 10^-3 Nsm^-2

0.801 x 10^-3 N-sm^-2

6.29 x 10^-3 N-sm^-2

0.081 x 10³ N-sm^-2

Velocity is a physical quantity which is

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Scalar quantity

Vector quantity

Variable quantity

None of these

Travel time of light from sun to earth is

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8 hours 20 minutes

8 minutes 20 seconds

1 minutes 20 seconds

5 hour 20 seconds

A magnetic field

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Always exerts a force on a charged particle

Never exerts a force on a charged particle

Exerts a force on a charged particle if it is moving across the magnetic lines of force

Exerts a force on a charged particle if it is moving along the magnetic lines of force.

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