Question # 1

A car moves for half of its time at 80 km/h and rest half of time at 40 km/h, The total distance covered is 60 km. What is the average speed of the car?

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60 km/hr

80 km/hr

120 km/hr

180 km/hr

An emf is set up in a conductor when it

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

An electric field is generated along the wire when:

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Its resistance is very high

A constant potential is maintained across the wire

Net current through the wire is zero

A constant potential difference is maintained across the wire

Either (A) or (D)

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

Wave length of light, on the average, is given by:

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10^-14_m

10^-10_m

10^-6_m

10^-4_m

Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at

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125 K

25 K

263 K

163 K

Electron is a particle whose mass is:

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Greater than that of a proton

Smaller than that of a proton

Smaller than that of a proton or a neutron

Greater than that of an atom

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

The basis to define a temperature scale that is independent of material properties is provided by

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carbon cycle

nitrogen cycle

Carnot cycle

irreversible cycle

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

Viscosity of gases with increase in temperature

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Increase

Decrease

Remains same

None

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 wavelength of X-rays is about

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10^-14m

10^-10m

10^-6m

10^-4m

Electrical activity of the retina the eye, generates which is used in electro ethnography as

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Current

Voltage

Resistance

None of these

Blood is an incompressible fluid having density nearly equal to

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Milk

Honey

Water

None of these

The effect is to increase the inflating the bag is

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To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

The transmitter in optical fiber system contains a device called

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LED

Diode

Transistor

None of these

At 0 K a piece of Ge and Si is a perfect

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Conductor

Insulator

Semiconductor

None of these

A car travels due east on a level road for 3 km. it then turns the North at an intersection and travels 4 km before stopping.The magnitude of the resultant displacement of car is

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5 km

7 km

1 km

11 cm

How many phone calls can be carried by single mode step index fibre

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25000

96000

14000

21000

In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width

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Becomes doubled

Becomes 4 times

Is halved

Remains the same

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