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The man is a writer. The girl is a school girl.

The girl is a good student.

The man’s name is Bond. The girl’s name is Usha .

She had her own goats at home

Usha advanced on the goat shouting with an open blue umbrella and drives them away.

The man and the girl share a common interest. They both keep looking for new species .

The author had wondered what its name could be. But the villagers had given it the name Basant .

Basant Panchami

they did not know its botanical name

i. a new flower

Quarks having the fractional charges are thought to be confined within a proton or a neutron only. These quarks are bound by forces, which grow stronger, if they are tried to be pulled apart. Thus, the quarks always remain together. It follows that though fractional v charges exist in nature, the observable charges are always integral multiples of e.

According to Pauli's exclusion principle, "only two electrons may exist in the same orbital and these electrons must have opposite spin."

For M-shell n = 3

Maximum number of electrons in the shell

= 2n²

= 2(3)²

= 18

According to this principle, "No two electrons in an atom can have the same set of four quantum numbers."

This is because according to the principle, if one electron in an atom has same particular values for the four quantum numbers, then all the other electrons in that atom are excluded from having the same set of values.

1. The property which resists the relative motion between two surfaces in contact is called friction. 

2. The coefficient of static friction is defined as the ratio of limiting force of friction to the normal reaction. 

Formula: μ_s = F_L/N

3. The coefficient of kinetic friction is defined as the ratio of force of kinetic friction to the normal reaction between the two surfaces in contact.

Formula : μ_s = F_k/N

Given: m = 37 kg, µ_s = 0.3, g = 9.8 m /s² 

To find : Limiting force (F_L)

Formula : F_L = µ_sN = µ_s mg

Calculation: From formula,

F_L = 0.3 × 37 × 9.8 = 108.8 N

The force required to move the block is 108.8 N.

The President is elected for a period of 5 years. He or she can be re-elected after his or her term.

The President is elected indirectly by the elected members of the Legislature as he or she is a nominal (de jure) and not the de facto head. An Electoral college elects the President. The Electoral College elects the President. 

The Electoral College consists of the following members:

1. The elected members of both Houses of Parliament.

2. The elected members of the State Legislative Assemblies

Rashtrapati Bhavan, President of India.

The region of space around the nucleus where the probability of finding an electron is maximum is called an orbital.

(b) ∆U < 0, W > 0

The heat capacity of a body is defined as the amount of heat required to raise its temperature through one degree

(c) ∆U > 0, Q > 0

These three revolutionaries and fast friends which were hanged on the same day (23^rd March 1931) are: Bhagat Singh, Sukhdev and Rajguru.

(i) Away from the magnet.

(ii) Magnetic moment is from left to right

(c) is zero, otherwise there would be a field falling as 1/r³ at large distances outside the toroid. 

1. Electronic configuration : 

₇N Is² 2s² 2p_x¹ 2p_y¹  2p_z¹ 

₈O Is² Is² 2p_x² 2p_y¹  2p_z¹ 

2. Nitrogen has extra stability due to half-filled porbitals. Therefore it has higher first ionisation enthalpy. 

3. Oxygen by losing one electron from 2px orbital acquires extra stability of half-filled 7-orbitals and hence has lower ionisation enthalpy. 

4. Therefore oxygen has lower ionisation enthalpy than nitrogen.

Correct option is B) length

Correct option is A) MW

Correct option is C) 2 kg

Here, f =15cm and 2f = 30cm

(i) 20 cm (Because a magnified real image is formed when the object is placed between f and 2f).

(ii) 10cm (Because a magnified virtual image is formed when the object is placed between f and the lens).

(iii) 35cm (Because a diminished real image is formed when the object is placed beyonf 2f).

(iv) 30cm (Because an image of same size as the object is formed when the object is placed at 2f).

Correct option is B) 4 j

To determine the focal length of a convex lens, we put the convex lens in a holder and keep it in front of a distant object like a window or tree, so that the rays coming from the window pass through it. A cardboard screen is put behind the lens. We change the distance of the screen from the convex lens until a clear inverted image of the window is formed on the screen. Measure the distance of the screen from the lens with a scale. This distance will be the focal length of convex lens.

Here, 2f = 36 cm, f = 18 cm.

(a) When the object is placed at a distance of 10 cm from the lens, the object lies within the focus. Hence, the image formed is virtual, erect and magnified.

(b) When the object is placed at a distance of 20 cm from the lens, the object lies between f and 2f. Hence, the image formed is real, inverted and magnified.

Place a source of light at the focus of the converging lens.

The cobra regarded his opponent as a superb fighter, clever and aggressive. They were true warriors as they fought valiantly.

Students got different focal lengths. 

1. By observing the values they got all positive values. This indicates they are given by convex lens. 

2. All the students got exact interger but different decimal value.

Reasons : 

The difference in values is due to least count errors, parallax errors, random errors and systematic errors, etc.

The cobra stood on the defensive, swaying slowly from side to side, trying to mesmerize the mongoose into making a false move. His great hood came down so swiftly that the writer thought the mongoose would be killed.

It was the improved models that found eager buyers.

(i) The ray AB is the incident ray. 

(ii) The ray BC is the refracted ray. 

(iii) The ray CD is the emergent ray.

Thomson proposed the first atomic model followed by Rutherford and Bohr.

Hence, option C is the correct option.

1. The occurrence of a mirage

2. Flickering of an object seen through a turbulent stream of hot air rising above the Holi fire are examples of the effect of atmospheric refraction on a small scale in local environment.

When a ray of light travels obliquely from an optically rarer medium (lower refractive index) to an optically denser medium (higher refractive index), the ray bends towards the normal. When a ray of light travels obliquely from an optically denser medium to an optically rarer medium, the ray bends away from the normal. For a given angle of incidence (i ≠ 0), the extent of refraction (bending) of light is different in different media.

If the refractive index of the second medium with respect to the first medium is greater than 1, the greater the refractive index, the greater is the bending of the ray of light towards the normal. If the refractive index of the second medium with respect to the first medium is less than 1, the greater the refractive index, the lesser is the bending of the ray of light away from the normal.

A) A coin kept at a bottom of vessel filled with water appears to be raised

Correct option is  A) Snell’s law

B) n₁ /n₂ = sin r/sin i 

Correct option is  D) 8/9