UKPCS Science Chemistry: Compound vs Molecule#3

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science Chemistry (paper 6). 

What is the difference between a compound and a molecule?

  • A molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds.
  • Molecular hydrogen (H2), molecular oxygen (O2) and molecular nitrogen (N2) are not compounds because each is composed of a single element. Water (H2O), carbon dioxide (CO2) and methane (CH4) are compounds because each is made from more than one element. The smallest bit of each of these substances would be referred to as a molecule. For example, a single molecule of molecular hydrogen is made from two atoms of hydrogen while a single molecule of water is made from two atoms of hydrogen and one atom of oxygen.

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Target UPSC prelims 2019: Daily MCQs #28

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs.

1. Consider the following statements with respect to Minimum Support Price (MSP):
1. MSP is determined for the country as a whole and not region or state-specific.
2. Commission for Agricultural Costs and Prices (CACP) approves MSPs for
various crops.
Which of the statement(s) given above is/are
incorrect?
a. 1 only
b. 2 only
c. Both 1 and 2
d. Neither 1 nor 2
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Union Budget 2019-20

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you budget 2019-20.

Hi Friends,

After the analysis of the budget, we have compiled a concise document for all the new schemes launched by the government.

The document will be helpful at every level of exam – Prelims, Mains and Interview.

Regards
ORACLE IAS

Click Here: Union Budget 2019-20

Click Here: Union Budget 2018-19

Target UPSC prelims 2019: Daily MCQs #25

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs.

1. Regulatory Indicators for Sustainable Energy” (RISE) report was released by which of the following?
a. International Energy Agency
b. World Bank
c. The Energy and Resources Institute

d. United Nations Development Programme Continue reading “Target UPSC prelims 2019: Daily MCQs #25”

Target UPSC prelims 2019: Daily MCQs #24

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs.

1. Consider the following statements with respect to Agni-V.
1. It is an Inter-Continental Ballistic Missile (ICBM) with a range of over
5,000 km and can reach most parts of China.
2. It is powered by three stage solid and liquid propellant engine.
3. It is a part of Integrated Guided Missile Development Program (IGMDP).
Which of the statement(s) given above is/are
correct?
a. 3 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2 and 3
Continue reading “Target UPSC prelims 2019: Daily MCQs #24”

Target UPSC prelims 2019: Daily MCQs #23

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs.

1. Consider the following statements with respect to Know India Programme (KIP):
1. It is an information repository programme, where the ongoing developments in India on various fields are updated online.
2. It is being implemented by the Ministry of Information and Broadcasting (MIB).
3. Its main objective is to provide young persons of Overseas Indians an
exposure to the country of their origin.
Which of the statement(s) given above is/are
correct?
a. 3 only
b. 1 and 2 only
c. 1 and 3 only
d. 2 and 3 only
Continue reading “Target UPSC prelims 2019: Daily MCQs #23”

UKPCS Science: Conductors, semiconductors and insulators(2) #32

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science (paper #6).

Semiconductor materials

Elements that are used as semiconductors, such as silicon and germanium, have four outer shell electrons. This means that they can form four bonds with other identical atoms.

In a crystal of pure silicon each silicon atom is surrounded by four other silicon atoms. In this state the silicon will not conduct.

Pure silicon can be doped by tiny quantities of impurities by diffusing the impurities as a gas into the liquid semiconductor before it crystallizes. If an impurity element with five outer shell electrons, such as arsenic, is added to silicon in small quantities, (approximately one impurity atom to every one million silicon atoms), the impurity atoms will fit into the crystal structure but there will be one electron not bonded into the valence band of the crystal. This free electron is a charge carrier able to move within the conduction band.

This impurity causes the material to conduct and is called n-typesilicon.

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Target UPSC prelims 2019: Daily MCQs #22

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs.

1. Consider the following statements with respect to Aero India 2019:
1. It is an exhibition show, held annually.
2. The logo created for the event is inspired by the indigenous Light
Combat Aircraft, Tejas.
3. The tagline for Aero India 2019 is “Touch the sky with Glory”
Which of the statement(s) given above is/are
correct?
a. 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2 and 3
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UKPCS Science: Conductors, semiconductors and insulators(1) #31

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science (paper #6).

Classifying materials

Materials can be placed into three groups according to their electrical resistance:

  • conductors
  • semiconductors
  • insulators

Insulators and pure semiconductors have a very high resistance, while conductors have a very low resistance. This difference in conduction is explained by electron bands.

Band theory of conduction Continue reading “UKPCS Science: Conductors, semiconductors and insulators(1) #31”

Target UPSC prelims 2019: Daily MCQs #21

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you daily MCQs.

1. Consider the following statements:
1. According to Indus Water treaty, India got the full rights for utilization of
waters of the three Eastern Rivers Ravi, Beas and Satluj.
2. Shahpurkandi Dam is planned to be built across the River Satluj.
3. Implementation of the Shahpurkandi Dam project would minimise wastage of water to Pakistan.
Which of the statement(s) given above is/are correct?
a. 3 only
b. 1 and 2 only
c. 1 and 3 only
d. 2 and 3 only
Continue reading “Target UPSC prelims 2019: Daily MCQs #21”