Red light of wavelength 625 nm is incident normally on an optical diffraction grating with 2 ´ 105 lines/m. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?
Marie and Pierre Curie invented
When resistors are connected in series, their equivalent resistance is given by?
Product of the individual resistances
Sum of the individual resistances
Sum of reciprocals of the individual resistances
Sum of square of each individual resistances
If a rock is brought from the surface of the moon to the earth, then
Its mass will change
Its weight will change but not its mass
Both mass and weight will change
Both mass and weight will remain the same
A closed organ pipe and an open organ pipe of same length produce 2 beats/second while vibrating in their fundamental modes. The length of the open organ pipe is halved and that of closed pipe is doubled. Then, the number of beats produced per second while vibrating in the fundamental mode is ______.
According to the Newton’s Universal law of gravitation, “Every body in the universe attracts every other body with a force which is?
Directly proportional to the distance between them
Directly proportional to the product of their masses
Directly proportional to the product of forces
Directly proportional to the product of their radius
Which instrument is used to measure depth of ocean ?
Lognitudinal waves and Transverse waves are types of ?
Both of above
None of Above
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
Metals have higher thermal capacity than plastics
Plastics have a lower density than metals
Metals are good conductor of heat
Plastics have a higher thermal conductivity than metals
Which instrument is used to measure the scattering of light by particles suspended in a liquid ?
The motion of a projectile follows a?
The apparent weight of a person standing in a elevator which is moving down with uniform acceleration will be?
Same as the weight on the surface of the earth
Greater than its weight on the surface of the earth
Less than its weight on the surface of the earth
Twice the weight of on the surface of the earth
Radian per second is unit of
Moment of Inertia
If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?
None, all have same wavelength
Consider the following statements: 1. If magenta and yellow-coloured circles intersect, the intersected area will have red colour. 2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour. Which of the statement(s) given above is/are correct?
Both 1 and 2
Neither 1 nor 2
A dry cell supplies?
Both alternating and direct current
None of above
The dimensions of universal gravitational constant are
M2 L2 T-2
M-1 L3 T-2
M L2 T-2
M L-1 T-2
A 20 cm length of a certain solution causes right handed rotation of 38°. A 30 cm length of another solution causes left handed rotation of 24°. The optical rotation caused by 30 cm length of a mixture of the above solutions in the volume ratio 1 : 2 is
Right handed rotation of 3°
Left handed rotation of 3°
Right handed rotation of 14°
Left handed rotation of 14°
in 1666, Newton concluded that the force which caused an apple to fall to the ground and the force that kept the moon in its orbit around the earth is the ?
Weight called as “Weightlessness
Acceleration called as “Centripetal acceleration”
Universal force called as “Gravitation”
Universal force called as “Artificial Gravity”
A In Young's double slit experiment if monochromatic light used is replaced by white light, then _______.
All bright fringes become white
All bright fringes have colours between violet and red
No fringes are observed
Only central fringe is white, all other fringes are coloured
A wire of 50 cm long and 1 mm² in cross-sectional area carries a current 4A when connected to a 2V battery. The resistivity of the wire is
2 x 10 -7 Ωm
5 x 10 -7 Ωm
4 x 10 -6 Ωm
1 x 10 -6 Ωm
Atom is the smallest part of matter which takes part in chemical reactions.
One should not connect a number of electrical appliances to the same power socket because
This can damage the appliances due to overloading
This can damage the domestic wiring due to overloading
This can damage the electrical meter
The appliance will not get full voltage
In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be :
Consider the following statements. Work is not done, when: 1. a man is walking on a horizontal road. 2. a man is climbing up a hill. 3. a man with a load on his head is walking on a horizontal road. 4. moon is revolving round the earth. Which of the statements given above are correct?
1 and 3 only
1 and 4 only
2, 3 and 4
1, 3 and 4
The force which opposes the relative motion between different layers of liquid or gases is called
A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75°C. T is given by : (Given : room temperature = 30° C, specific heat of copper = 0.1 cal/gm°C
Out of the following pairs, which one does not have identical dimension?
Moment of inertia and moment of a force
Work and Torque
Angular momentum and Planck's constant
Impulse and Momentum
Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
Will not rise
Change its meniscus
Minimum number of unequal vectors which can give zero resultant are
More than four
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