Chemistry-
General
Easy
Question
Which one of the following species will give a series of spectral lines similar to that of series of Mg2+:
- Al3+
- Na
- Mg+
- F
The correct answer is: Al3+
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The velocity of electron in third excited state of Be3+ will be-
The velocity of electron in third excited state of Be3+ will be-
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A photodetector is made from a semiconductor In 
As with 
. What is the maximum wavelength, which it can detect
A photodetector is made from a semiconductor In As with . What is the maximum wavelength, which it can detect
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For Li+2,r2:r5 will be-
For Li+2,r2:r5 will be-
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When the atoms of gold sheet are bombarded with a be am of α-particles, only a few α- particles get deflected where as most of them go straight un deflected. This is because–
IT was the logical conclusion of his experiment.
When the atoms of gold sheet are bombarded with a be am of α-particles, only a few α- particles get deflected where as most of them go straight un deflected. This is because–
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IT was the logical conclusion of his experiment.
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Mass of neutron is........times the mass of electron -
Mass of neutron is........times the mass of electron -
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Massof isminimum
Which has highest e/m ratio–
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Massof isminimum
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At room temperature, sodium crystal lises in a body centred cubic cell with a=4.24Å. The the oretical density of sodium is–(Atomic mass of sodium=23.0gmol–1)
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General
________ is a sudden shaking of the Earth’s crust.
The correct option is c)Earthquake.
- An earthquake (also called a tremor, tremor, or tremor) is a shaking of the earth's surface caused by the sudden release of energy in the earth's lithosphere that produces seismic waves.
- The strength of an earthquake can range from weak enough to be felt to strong enough to throw objects and people into the air and destroy entire cities.
- On the earth's surface, earthquakes appear as ground vibrations, displacements, and disturbances. If the epicenter of a large earthquake is offshore, the seafloor may shift and generate a tsunami. Earthquakes can also cause landslides.
________ is a sudden shaking of the Earth’s crust.
GeneralGeneral
The correct option is c)Earthquake.
- An earthquake (also called a tremor, tremor, or tremor) is a shaking of the earth's surface caused by the sudden release of energy in the earth's lithosphere that produces seismic waves.
- The strength of an earthquake can range from weak enough to be felt to strong enough to throw objects and people into the air and destroy entire cities.
- On the earth's surface, earthquakes appear as ground vibrations, displacements, and disturbances. If the epicenter of a large earthquake is offshore, the seafloor may shift and generate a tsunami. Earthquakes can also cause landslides.
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For the structure given below the site marked as S is a :
For the structure given below the site marked as S is a :
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A compound alloy of gold and copper crystallizes in a cube lattice in which the gold atoms occupy the corners of a cube and the copper atoms occupy the centres of each of the cube faces. The formula of this compound is-
One-eighthofeachcorneratom(Au)andone- half of each face-centered atom (Cu) are contained withintheunit cellofthecompound. Thus, the number ofAu atoms per unit cell
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One-eighthofeachcorneratom(Au)andone- half of each face-centered atom (Cu) are contained withintheunit cellofthecompound. Thus, the number ofAu atoms per unit cell
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An equiconvex lens is cut into two halves along (i) XOX¢ and (ii) YOY¢ as shown in the figure. Let f, f ¢, f ¢¢ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively
Choose the correct statement from the following
An equiconvex lens is cut into two halves along (i) XOX¢ and (ii) YOY¢ as shown in the figure. Let f, f ¢, f ¢¢ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively
Choose the correct statement from the following
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A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The image would be formed at
By using formula 
.
Negative sign shows that, image is obtained on the same side of object i.e. towards left.
.Negative sign shows that, image is obtained on the same side of object i.e. towards left.
A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The image would be formed at
physics-General
By using formula
.
Negative sign shows that, image is obtained on the same side of object i.e. towards left.
.Negative sign shows that, image is obtained on the same side of object i.e. towards left.
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A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed are
Number of images = (Number of materials)
A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed are
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Number of images = (Number of materials)
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In FCC crystal, which of the following shaded planes contains the following type of arrangement of atoms
In FCC crystal, which of the following shaded planes contains the following type of arrangement of atoms
chemistry-General
