Bihar PGT Chemistry Mock Test - 10 - Bihar PGT/TGT/PRT MCQ

The sentence starts in past tense hence the ending cannot be in the future tense so as to maintain uniformity.
Correct Sentence- He informed me earlier that he would not come.  

The correct option is Option 4, i.e., ‘discourage’.
The word ‘dissuade’ means ‘to advise against something’. The word closest in meaning, from the given options is ‘discourage’, which has a similar meaning. Hence, the correct option is Option 4.

उक्त पँक्तियों में गीतिका छन्द का प्रयोग किया गया है।

प्रत्येक चरण में 14 और12 की यति से 26 मात्राएँ होती हैं 

प्रत्येक चरण के अंत में लघु और गुरु होता है।  

The correct answer is Encourage export.

• Devaluation of a currency occurs when the currency's value in foreign exchange is low.
• For example, devaluation of Indian currency means one rupee has less worth compared to other foreign currencies.
• It makes the exports (nation’s goods) more affordable in the global market.
• It helps in the country's economic growth.
• Devaluation makes imports more expensive and creates demand for exports.

The correct answer is Kathmandu (Nepal)

Key Points

• SAARC is South Asian Association for Regional Cooperation, which is a regional intergovernmental organisation.
• It was founded on 8 December 1985 in Dhaka.
• It aims to promote the development of economic and regional integration.
• It is headquartered in Kathmandu, Nepal.
• The South Asian Free Trade Area was launched on 1st January 2006 to create a free trade zone between its members.
• As of March 2020 Esala Ruwan Weerakoon is the Secretary-General. He assumed office on 1st March 2020.

Additional Information

• Given below is the list of all members of SAARC:
  • Afghanistan
  • Bangladesh
  • Bhutan
  • India
  • Maldives
  • Nepal
  • Pakistan
  • Sri Lanka

According to the information given in the question, we can draw the following diagram.

AC = 40 km
BC = 30 km
AB = AC - BC
AB = 40 - 30
AB = 10 km
Ravi is 10 km away from his starting point.
Hence, the correct answer is "10 km".

The correct answer is 1 hour 45 minutes

There is a time lag of two hours from Gujarat to Assam because of the longitudinal extent of India. Gujarat is situated in the extreme west of India while Assam located in the north-eastern part. The Sun rises almost two hours earlier in Assam than in Gujarat.

Key-Points

• India lying entirely in the Northern hemisphere the mainland extends between latitudes 8°4'N and 37°6'N and longitudes 68°7'E and 97°25'E.
• The Westernmost point of India is 68°7'E, known as Ghuar Mati, Gujarat
• Location of Dwarka, Gujarat, India (N 22° 14' 36.0132", E 68° 58' 7.6908") on the map
• Coordinates of Dibrugarh: 27° 28' 22.2024'' N, 94° 54' 43.0704'' E
• The difference between the two points is almost 26°2'.
• Difference of time, 1° longitudinal difference = 4 mins time lag
• 30° longitudinal difference brings 26*4 = 104 mins difference in time
• 104 mins or 1 hour 44 mins hours time-lag between Gujrat and Assam found.
• So it is clear that 1 hour 45 minutes is the local time difference between Dwarka in Gujarat to Dibrugarh in Assam

Hence, option 1 is the correct answer.

For this question, we will use the given table-

The relation of NZ : MA  is given below-

Similarly,

We will apply the same relation to TV : ? as-

Hence, Option (3) is correct.

The correct answer is option A
For the reaction rate of disappearance of A is related to rate of appearance of B by the expression:

The correct answer is option D.
Pair of enantiomers react differently with pure enantiomers of other compounds.
 

a) More molar mass, more entropy. So ∆_SN2O4 > ∆S_NO2
b) CO₂ has more entropy than dry ice at -78°C
c) Pure alumina iss crystalline solid while ruby is amorphous. And ∆S_amorphous > ∆S_Crystalline. So alumina has less entropy than ruby.
d) At lower pressure, entropy be higher as gas particles are far from each other. So (∆S_N2)1 _bar > (∆S_N2)_{5 bar} 
 

The correct answer is  Option A.
The concentration of the reactant decreases from 0.8M to 0.4M in 15 minutes, i.e. t_1/2 = 15 minutes. Therefore, the concentration of the reactant will fall from 0.1M to 0.025M in two half lives. i.e.    2t_1/2 = 2 × 15 = 30 minutes.

 + 4H₂O + 3e^- → Cr(OH)₃ + 5OH^-, E° = - 0.13 V 
+ 14H⁺ + 6e^- → 2Cr³⁺ + 7H₂O , E° = 1.33 V

BeO is amphoteric as it can react with both acids and base
BeO₊₂NaOH = Na₂BeO₂
BeO+H₂SO₄ + BeSO₄ + H₂O
On the other hand, MgO and Cao are metallic oxides and act as a base only.

Benzene diazonium chloride is hydrolysed to phenol when heated with water.
ArN₂Cl + H₂O ----> ArOH + N₂ + HCl 

The correct answer is option A
2-hexyne with Li/NH3​ gives trans-2-hexene. This reaction is also considered as Birch reduction.

Electron gain enthalpy values of noble gases are positive because they have stable electronic configuration and thus have no tendency to take additionalelectron.

Only structure a is able to show the valence electrons along with charge distributions. So, ith the Lewis structure of HNO₃ .

In elimination reaction of alkyl halide major product is obtained according to Saytzeff’s rule, which states that when two alkenes may be formed, the alkene which is most substituted one predominates.

4 aromatic isomers are possible.

Alkaline earth metals have valency +2. So on reaction with halogen, they form compounds MX₂.

Here all compounds except in option c are achiral. So automatically option c is correct.

The process of conversion of primary aromatic amines into its diazonium salt is called diazotization. Diazonium salts are important synthetic intermediates that can undergo coupling reactions to form azo dyes and electrophilic substitution reactions to introduce functional groups.

XeF₂ molecular geometry is linear. It acquires such shape as the lone pairs present around the central atom tend to take up equatorial positions. The bond angle is said to be 180°.

For the spectral line in H -atom and H -like species (one electron)

For Lyman series
For shortest wavelength (maximum wave number) n₂ → ∞



For longest wave length (minimum wave number), n₂ = (n₁, + 1).
For Balmer series, n₁ = 2