DSSSB PGT Chemistry Mock Test - 4 - DSSSB TGT/PGT/PRT MCQ

Hands will be at right angle twice every hour except from 2 to 4 and 8 to 10 where hands will be at right angle only thrice instead of four times.
Thus, hands will be at right angle 22 times in 12 hours or 44 times in 24 hrs.

Acids taste sour due to their acidic properties and interaction with the taste buds on our tongues. The sour taste is a result of the release of hydrogen ions and their interaction with specific receptors on our taste buds. Carbon dioxide is incombustible and also does not support burning. Hence, it is used in fire extinguishers.

The controversy is about the monsoon fed river and the glacier fed river.

it is stated clearly in the first line of the passage that the purpose of control system is to keep the out constant inspite of changes in load.

The SP = 106.25% of the CP. Thus, CP = 29.75/1.0625
= ₹ 28.

‘रचनाकार’ अर्थात रचना को करने वाला।
जिस समास का उत्तरपद प्रधान हो और पूर्वपद गौण एवं 'को' चिह्न का लोप हो उसे कर्म तत्पुरुष समास कहते हैं। अत: यह कर्म तत्पुरूष समास का उदाहरण है।
उदाहरण:
शाकाहरी = शाक को खाने वाला।

‘अत्याधिक’ अर्थात भरपूर मात्रा।
‘स्वल्प’ अर्थात कम।
‘अग्रणी’ अर्थात जो सबसे आगे रहता हो।
‘जलचर’ अर्थात जल में विचरने वाले जीव।
‘जिजीविषु’ अर्थात अधिक समया तक जीते रहने को इच्छुक।

दो वाक्यों में एक वाकया प्रधान और दूसरा वाक्य गौण हो तथा आपस में (कि, जो, क्योंकि, जितना -उतना, जैसा -वैसा, जब -तब, जहाँ -वहाँ, जिधर -उधर )से जुड़े होते है, "तो" मिश्र वाक्य का योजक चिन्ह है। अतः दिया गया वाक्य मिश्र वाक्य है।

सुशीला स्त्रीलिंग शब्द है। स्त्रीलिंग शब्द है जैसे- प्रार्थना, वेदना, प्रस्तावना, रचना, घटना इत्यादि। (इ) उकारान्त संज्ञाएँ। जैसे- वायु, रेणु, रज्जु, जानु, मृत्यु, आयु, वस्तु, धातु इत्यादि। अपवाद- मधु, अश्रु, तालु, मेरु, हेतु, सेतु इत्यादि।

n can vary from to 10 and can be +ve or –ve.

ZnS shows Frenkel defect.

(c) Close packing in two-dimensions can be Type I A A A ...... ty p e The second row may be ^ placed in contact with the first one such that the spheres of A the second row are exactly . above those of the first row.
The spheres of the two rows A are aligned horizontally as well as vertically. In this arrangement, each sphere is in contact with four of its neighbours.
Thus, its coordination number = 4 and is called square close packing in two-dimensions.
Atom A (•) is in contact with four others.

Type II ABAB... type The second row may be placed above the first in a staggered manner such that its spheres fit in the depressions of the first row.
First row arrangement: A type Second row arrangement: 8 type Third row arrangement: A type and so on There is less free space and packing is more efficient than the square close packing. Each sphere is in contact with six of its neighbours and coordination number = 6 in two-dimensions. It is called two dimensional hexagonal close-packing. Voids formed in this case are triangular in shape. If the apex of the triangles downward in the first row, it is upward in the second row.

Molecular solids consist of atoms or molecules held to each other by dipole-dipole interactions, London dispersion forces, hydrogen bonds, or any combination of these. 

Additional Information: Hydrogen bonding refers to the formation of Hydrogen bonds, which are a special class of attractive intermolecular forces that arise due to the dipole-dipole interaction between a hydrogen atom that is bonded to a highly electronegative atom and another highly electronegative atom which lies in the vicinity of the hydrogen atom. 

Dalton’s atomic theory stated that atoms were indivisible. However, the discovery of subatomic particles (such as protons, electrons, and neutrons) disproved this postulate.

Given m_p = 1.67×10^-27kg
h = 6.63×10^-34Js
v = 1.0×10³ms-1

We know wavelength λ = h/mv
∴λ = 6.63×10^-34/(1.67×10^-27 × 1.0×10³)
= 0.40×10^-10
≈ 0.40nm

Hence, Option (B) is the Correct Answer.

• Number of radial nodes = n - l – 1

where n = principal quantum number, l = azimuthal quantum number

• For 3p orbital, n = 3 – 1 – 1 = 1
• Number of radial nodes = 3 – 1 – 1 = 1. 

[H⁺]₁ = 10^–2 ; [H⁺]₂ = 10^–6

Chemical Kinetics deals with rate of a Chemical reactions.

The correct answer is option A

E cell is 0 in equilibrium, that is Ecathode becomes equal to E anode ……….
EZero cell becomes zero when both the electrodes are of the same metal but of different concentration i.e for concentration cell……
We know that EZero cell is - Ezerocathode -E zeroanode (since cathode and anode are same ) so EZero =0
 

100g H₃P0₄ aqueous solution has 34g H₃P0₄

The correct answer is Option B.
 
∆T_b =(K_b × 1000 × W₂) / M₂ × W₁
⇒ M₂ = (K_b × 1000 × W₂) / ∆T_b × W₁
= (1.71 × 1000 × 2) / 1 × 100
= 34.2g

 If one considers following molecule, it is 

Symmetrical and thus
In the given species

The enthalpies of fusion for all reactions are always positive because melting of a solid is an endothermic process in which heat is supplied to the reaction Hence the sum of enthalpies of the product is greater than the sum of enthalpies of the reactant.

The negative electron gain enthalpy of fluorine is less than that of chlorine. It is due to small size of fluorine atom. As a result, there are strong interelectronic repulsions in the relatively small 2p orbitals of fluorine and thus, the incoming electron does not experience much attraction.

Cl, O, and N forms Cl₂, O₂ and N₂ respectively to satisfy octet rule but He has noble gas configuration so do not form any compound and exist as monoatomic gas.

Requirement of macronutrient per acre of the land is 5 to 200 kg

The correct answer is option A
 
Higher temperatures  speed up the effect of enzyme activity, while lower temperatures decrease the rate of an enzyme reaction. if the temperature is too high, an enzyme will denature, which causes the shape of the enzyme to change. If the enzyme's shape changes, it cannot bind to the substrate.