HPSC PGT Chemistry Mock Test - 9 - HPSC TGT/PGT MCQ

The correct answer is Climate.

Key Points

• The average pattern of wind speed, temperature, rainfall, etc, in place over a long period of time, is called climate.
• Climate is the average weather in a place over many years.
• The weather can change in just a few hours whereas climate takes millions of years to change.
• Planet earth has witnessed many variations in climate since the beginning.
• There are several causes of climate change.
• The most significant anthropogenic effect on the climate is the increasing trend in the concentration of greenhouse gases in the atmosphere.

The correct answer is Cinema.Key Points

• Devi Shankar Prabhakar is related to Cinema
• Devi Shankar Prabhakar Life Time Award was awarded to Chandrawal film artist Dariav Singh.
• In film, the film Robin won the most awards.
• Director Dharmendra Dangi told that 316 entries were received for the festival in 20 languages from 22 countries, out of which 60 films were selected and shown to the audience.
• Stage operations were done by Alpana Suhasini, Rupam Ahlawat and Sameer Chowdhary.

The correct answer is Ambala.

• In Ambala, women participated in a movement that was started by Lala Dulichand's daughters, Vidyavati, Yashoda and Jamuna.

Key Points

• Civil Disobedience Movement:
  • Gandhiji started the his toric 'Dandi March' on 12 March 1930 with 78 selected Satyagrahis.
  • Lala Surajbhan of Ambala was one of these representatives.
  • Many students left their schools to participate in the Civil Disobedience Movement.
  • One of them was Chaudhary  Devi Lal.

Given:

The ratio of the present age of Annu and Raj = 4 : 5

Then after 8 years ratio of their age = 5 : 6

Calculation:

Let be assume the present age of Annu and Raj is 4x and 5x respectively

⇒ (4x + 8)/(5x + 8) = 5/6

⇒ 24x + 48 = 25x + 40

⇒ x = 8

⇒ The age of Annu = 4x = 4 × 8 = 32

⇒ The age of Raj = 5x = 5 × 8 = 40

∴ The required result will be 32 years, and 40 years respectively.

By using the symbols in the table given below, we can draw the following family tree:

We do not know the gender of Shanti. 
Clearly, Shaurya is the cousin of Karan.
Hence, ‘Cousin’ is the correct answer.

Hence, "Printer" is the correct answer.

Important PointsInput Device: A piece of equipment/hardware that helps us enter data into a computer is called an input device. For example keyboard, mouse, etc. 

1. Keyboard:

• A simple device comprising keys and each key denotes either an alphabet, number, or number commands which can be given to a computer for various actions to be performed
• It has a modified version of typewriter keys
• The keyboard is an essential input device and computers and laptops both use keyboards to give commands to the computer

2. Joy Stick:

• It is a device that comprises a stick that is attached at an angle to the base so that it can be moved and controlled
• Mostly used to control the movement in video games
• Apart from a computer system, a joystick is also used in the cockpit of an aeroplane, wheelchairs, cranes, trucks, etc. to operate them well

3. Scanner:

• This device can scan images or text and convert it into a digital signal
• When we place any piece of a document on a scanner, it converts it into a digital signal and displays it on the computer screen

Output Device: A piece of equipment/hardware that gives out the result of the entered input, once it is processed (i.e. converts data from machine language to a human-understandable language), is called an output device. For example printers, monitors, etc. 

Printer:

• A device that makes a copy of the pictorial or textual content, usually over a paper is called a printer
• For example, an author types the entire book on his/her computer and later gets a printout of it, which is in the form of paper and is later published
• Multiple types of printers are also available in the market, which can serve different purposes

(a) Zn is oxidised to Zn²⁺ in complex

(b) Au⁺ is reduced to Au — True
(c) Au (s) is displaced
(d) Since, it is a spontaneous reaction ΔG° < 0

Sorret established formula of ozone.

Based on VSEPR model, it is (T-shaped).
Thus, (i) → (r)


AX₄E₂ (Square planar)

Thus, (ii) → (s)
(iii)   lone pair = 1, AX₄E (See-saw)

Thus, (iii) → (q) 
lone pair = 3

Linear structure
Three lone pairs are at equatorial position to minimise repulsion.
Linear structure.
Three lone pairs are at equatorial position to minimise repulsion.
Thus, (iv) → (p)

Photoelectric effect proves the particle nature of light.

A hydrogen bond is a weak type of force that forms a special type of dipole-dipole attraction which occurs when a hydrogen atom bonded to a strongly electronegative atom exists in the vicinity of another electronegative atom with a lone pair of electrons.
F is the most electronegative atom. Hence hydrogen bond is shortest in F - H ........F.

Number of orbitals in a shell = n² = (5)² = 25

Reaction involves rearrangement of carbocation

Ozonolysis breaks the double bond and oxidizes that carbon. To solve these questions, when the reactants are asked, just remove the carbonyl oxygen from the products and join the resulting compounds using a double bond. 

(B)
HCP = AB AB AB . pattem repeat For calculating voids between two layers A and B. Total tetrahedral voids = 12 (represented by dots) out of which 8 are completely inside but rest are shared by other unit cells. Total octahedral voids = 6 (represented by cross). All are completely inside. 

Polar molecule will act as a dipole.

∆S_X→Z = ∆S_X→Y + ∆S_Y→Z(Entropy is a state function, so it is additive)
W_X→Y→Z = WX→Y (work done in _y→z is zero as the process is isochoric)

BCl₃ + 3H ⇋ B+3HCl
BCl₃ + 3/2 → B + 3HCl
3/2 mol → 1 mol
1 mol B → 3/2 molH₂
2 mole → 3/2  x 2 = 6/2 = 3 mole
1 mole = 22.4 liter S.T.P
3----? 
= 22.4 x 3
=67.2 litre

The reaction involves E2 elimination m echanism in w hich base approaches to β-H from side anti to leaving halide in the rate determining step. Hence, if tertiary butyl group is cis to tosylate, it would not give steric hindrance to the base approaching from opposite side to β-H

In HOCl, Cl acts as a cation and OH acts as an anion. First Cl⁺ attacks the aleke to form an electron deficient species(dueto repulsion, OH^- can’t attack). Then OH^- attacks to form compound a.

The rosenmund reaction is catalyzed by palladium on barium sulfate. Barium sulfate reduces the activity of palladium due to its low surface area meaning it decreases the reducing power of palladium in order to prevent over-reduction of the acid.

• John Newlands arranged the known elements in increasing order of their atomic masses.
• He started with the element having the lowest atomic mass ( hydrogen) and ended at thorium which was the 56th element.
• He found that every eighth element had properties similar to the first.

Manganate (VII) is MnO₄^- with ON of Mn = + 7
1 mole required 3F of electricity thus, 1 F will reduce only (1/3) mole MnO₄^- t o MnO₂.
Thus, MnO₂ formed = 0.33 mol.

Formal charge (F)

where, v = valence electrons = 6
s = shared electrons = 4
u = unshared electron = 4

photochemical smog has high concentration of oxidising agent.