MCQs
Total Questions : 99
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Answer: Option B. -> Tetra Ethyl Lead
TETRA ETHYL LEAD (TEL) IS ONE SUCH COMPONENT THAT IS ADDED TO PETROL TO REDUCE ITS TENDENCY TO `PING’ UNDER COMPRESSION. TEL BREAKS DOWN TO LEAD AT UPPER CYLINDER TEMPERATURES. LEAD ATOMS SPREAD AROUND AND COMBINING WITH THE FREE RADICALS AND SLOWING DOWN THE REACTION.
HOWEVER, `LEADED’ PETROL WAS A GRAVE DANGER TO THE ENVIRONMENT, AS LEAD IS A POISON WHEN IT IS ABSORBED INTO THE BODY.
TETRA ETHYL LEAD (TEL) IS ONE SUCH COMPONENT THAT IS ADDED TO PETROL TO REDUCE ITS TENDENCY TO `PING’ UNDER COMPRESSION. TEL BREAKS DOWN TO LEAD AT UPPER CYLINDER TEMPERATURES. LEAD ATOMS SPREAD AROUND AND COMBINING WITH THE FREE RADICALS AND SLOWING DOWN THE REACTION.
HOWEVER, `LEADED’ PETROL WAS A GRAVE DANGER TO THE ENVIRONMENT, AS LEAD IS A POISON WHEN IT IS ABSORBED INTO THE BODY.
Answer: Option A. -> K-40
POTASSIUM-40, WHICH IS A RARE RADIOACTIVE ISOTOPE OF POTASSIUM HAS A VERY LONG HALF LIFE. IT UNDERGOES ALL THREE TYPES OF BETA DECAY (ß-, ß+ AND ELECTRON CAPTURE). ABOUT 89% OF THE TIME 40K DECAYS TO CALCIUM-40 (40CA). HOWEVER, 11% OF THE TIME IT DECAYS TO ARGON-40 (40AR).
POTASSIUM-40, WHICH IS A RARE RADIOACTIVE ISOTOPE OF POTASSIUM HAS A VERY LONG HALF LIFE. IT UNDERGOES ALL THREE TYPES OF BETA DECAY (ß-, ß+ AND ELECTRON CAPTURE). ABOUT 89% OF THE TIME 40K DECAYS TO CALCIUM-40 (40CA). HOWEVER, 11% OF THE TIME IT DECAYS TO ARGON-40 (40AR).
Answer: Option C. -> Only 1 & 3
HALITE IS SODIUM CHLORIDE OR COMMON SALT. GUANO IS THE DROPPINGS OF THE FISH EATING BIRDS, WHICH IS RICH IN PHOSPHATE. PERU IS THE WORLDS LARGEST PRODUCER OF GUANO.
HALITE IS SODIUM CHLORIDE OR COMMON SALT. GUANO IS THE DROPPINGS OF THE FISH EATING BIRDS, WHICH IS RICH IN PHOSPHATE. PERU IS THE WORLDS LARGEST PRODUCER OF GUANO.
Answer: Option C. -> Both 1 & 2
BOTH ARE CORRECT STATEMENTS
BOTH ARE CORRECT STATEMENTS
Question 15. Identify the element with the help of given information:
1: It was the first element to be discovered with a spectroscope
2: It remains liquid at room temperature
3: It reacts violently with water so it is kept under a layer of kerosene or mineral oil
4: It is the softest known metal on earth
Select the correct answer from options given below:
1: It was the first element to be discovered with a spectroscope
2: It remains liquid at room temperature
3: It reacts violently with water so it is kept under a layer of kerosene or mineral oil
4: It is the softest known metal on earth
Select the correct answer from options given below:
Answer: Option A. -> Cesium
ALL GIVEN PROPERTIES ARE OF CESIUM.
CESIUM WAS THE FIRST ELEMENT TO BE DISCOVERED WITH A SPECTROSCOPE. CESIUM IS THE SOFTEST KNOWN METAL ON EARTH. IT REMAINS LIQUID AT ROOM TEMPERATURE. SINCE IT REACTS VIOLENTLY WITH WATER, IT IS KEPT UNDER A LAYER OF KEROSENE OR MINERAL OIL.
ALL GIVEN PROPERTIES ARE OF CESIUM.
CESIUM WAS THE FIRST ELEMENT TO BE DISCOVERED WITH A SPECTROSCOPE. CESIUM IS THE SOFTEST KNOWN METAL ON EARTH. IT REMAINS LIQUID AT ROOM TEMPERATURE. SINCE IT REACTS VIOLENTLY WITH WATER, IT IS KEPT UNDER A LAYER OF KEROSENE OR MINERAL OIL.
Answer: Option C. -> Strontium-90 gets deposited in bones and bone marrow and causes cancer
STRONTIUM-90 IS A “BONE SEEKER” THAT EXHIBITS BIOCHEMICAL BEHAVIOUR SIMILAR TO CALCIUM, THE NEXT LIGHTER GROUP 2 ELEMENT. AFTER ENTERING THE ORGANISM, MOST OFTEN BY INGESTION WITH CONTAMINATED FOOD OR WATER, ABOUT 70–80% OF THE DOSE GETS EXCRETED. VIRTUALLY ALL REMAINING STRONTIUM-90 IS DEPOSITED IN BONES AND BONE MARROW, WITH THE REMAINING 1% REMAINING IN BLOOD AND SOFT TISSUES. ITS PRESENCE IN BONES CAN CAUSE BONE CANCER, CANCER OF NEARBY TISSUES, AND LEUKAEMIA. (WIKIPEDIA)
STRONTIUM-90 IS A “BONE SEEKER” THAT EXHIBITS BIOCHEMICAL BEHAVIOUR SIMILAR TO CALCIUM, THE NEXT LIGHTER GROUP 2 ELEMENT. AFTER ENTERING THE ORGANISM, MOST OFTEN BY INGESTION WITH CONTAMINATED FOOD OR WATER, ABOUT 70–80% OF THE DOSE GETS EXCRETED. VIRTUALLY ALL REMAINING STRONTIUM-90 IS DEPOSITED IN BONES AND BONE MARROW, WITH THE REMAINING 1% REMAINING IN BLOOD AND SOFT TISSUES. ITS PRESENCE IN BONES CAN CAUSE BONE CANCER, CANCER OF NEARBY TISSUES, AND LEUKAEMIA. (WIKIPEDIA)
Answer: Option D. -> 1, 2, 3 & 4
SOME KEY NOTES ABOUT HYDROGEN:
HYDROGEN DOES NOT OCCUR IN FREE STATE IN ATMOSPHERE. HYDROGEN IS A VITAL CONSTITUENT OF ALL THE COMPOUNDS WHICH ARE KNOWN IN ANIMAL AND PLANT KINGDOM.
HYDROGEN CAN BE PREPARED BY THE ACTION OF WATER OR STEAM ON METALS.
HYDROGEN CAN BE PREPARED BY THE ACTION OF DILUTE HCL OR DILUTE H2SO4 ON THE METALS.
HYDROGEN CAN BE PREPARED BY BOILING POWDERED METALS LIKE ZINC, ALUMINUM, TIN AND LEAD WITH CONCENTRATED SOLUTION OF CAUSTIC SODA.
HYDROGEN CAN BE PREPARED BY PASSING ELECTRIC CURRENT THROUGH ACIDULATED WATER.
HYDROGEN IS A COLORLESS AND ODORLESS GAS HAVING NO TASTE. IT IS THE LIGHTEST ELEMENT AND IS PRACTICALLY INSOLUBLE IN WATER.
HYDROGEN IS PREPARED IN LAB BY THE ACTION OF DILUTE SULPHURIC ACID ON GRANULATED ZINC. IF COPPER SULPHATE IS ADDED TO THE ABOVE REACTANTS, THE REACTION SPEEDS UP.
HYDROGEN IS NEUTRAL TOWARDS LITMUS.
HYDROGEN REACTS WITH OXYGEN TO FORM WATER AS THE ONLY PRODUCT. IT REACTS WITH CHLORINE GAS TO FORM HYDROGEN CHLORIDE GAS.
HYDROGEN IS A GOOD REDUCING AGENT AND REDUCES METALLIC OXIDES TO METALS
HYDROGEN IS USED FOR (I) FILLING WEATHER OBSERVATION BALLOONS, (II) THE MANUFACTURE OF CHEMICALS, (III) THE HYDROGENATION OF OILS, (IV) THE EXTRACTION OF METALS FROM THEIR OXIDES, AND (V) CUTTING AND WELDING PURPOSES.
A MIXTURE OF HYDROGEN AND OXYGEN BURNS WITH A CHARACTERISTIC POP SOUND. IT IS A TEST FOR HYDROGEN.
SOME KEY NOTES ABOUT HYDROGEN:
HYDROGEN DOES NOT OCCUR IN FREE STATE IN ATMOSPHERE. HYDROGEN IS A VITAL CONSTITUENT OF ALL THE COMPOUNDS WHICH ARE KNOWN IN ANIMAL AND PLANT KINGDOM.
HYDROGEN CAN BE PREPARED BY THE ACTION OF WATER OR STEAM ON METALS.
HYDROGEN CAN BE PREPARED BY THE ACTION OF DILUTE HCL OR DILUTE H2SO4 ON THE METALS.
HYDROGEN CAN BE PREPARED BY BOILING POWDERED METALS LIKE ZINC, ALUMINUM, TIN AND LEAD WITH CONCENTRATED SOLUTION OF CAUSTIC SODA.
HYDROGEN CAN BE PREPARED BY PASSING ELECTRIC CURRENT THROUGH ACIDULATED WATER.
HYDROGEN IS A COLORLESS AND ODORLESS GAS HAVING NO TASTE. IT IS THE LIGHTEST ELEMENT AND IS PRACTICALLY INSOLUBLE IN WATER.
HYDROGEN IS PREPARED IN LAB BY THE ACTION OF DILUTE SULPHURIC ACID ON GRANULATED ZINC. IF COPPER SULPHATE IS ADDED TO THE ABOVE REACTANTS, THE REACTION SPEEDS UP.
HYDROGEN IS NEUTRAL TOWARDS LITMUS.
HYDROGEN REACTS WITH OXYGEN TO FORM WATER AS THE ONLY PRODUCT. IT REACTS WITH CHLORINE GAS TO FORM HYDROGEN CHLORIDE GAS.
HYDROGEN IS A GOOD REDUCING AGENT AND REDUCES METALLIC OXIDES TO METALS
HYDROGEN IS USED FOR (I) FILLING WEATHER OBSERVATION BALLOONS, (II) THE MANUFACTURE OF CHEMICALS, (III) THE HYDROGENATION OF OILS, (IV) THE EXTRACTION OF METALS FROM THEIR OXIDES, AND (V) CUTTING AND WELDING PURPOSES.
A MIXTURE OF HYDROGEN AND OXYGEN BURNS WITH A CHARACTERISTIC POP SOUND. IT IS A TEST FOR HYDROGEN.
Question 18. Consider the following differences between metals and non-metals:
1: While the oxides of metals are basic in nature, oxides of non-metals are acidic in nature
2: While most of the metals are solid at room temperature, most of non-metals are gaseous at room temperature
Which of the above statements is/are correct?
1: While the oxides of metals are basic in nature, oxides of non-metals are acidic in nature
2: While most of the metals are solid at room temperature, most of non-metals are gaseous at room temperature
Which of the above statements is/are correct?
Answer: Option C. -> Both 1 & 2
BOTH ARE CORRECT STATEMENTS
BOTH ARE CORRECT STATEMENTS
Answer: Option A. -> 1 & 3 Only
IN LIQUIDS MAIN CAUSE OF VISCOSITY IS COHESION BETWEEN THE MOLECULES. AS THE TEMPERATURE OF A LIQUID INCREASES, ITS SURFACE TENSION DECREASES.THE VISCOSITY OF LIQUIDS REDUCE WITH INCREASE IN TEMPERATURE.
IN LIQUIDS MAIN CAUSE OF VISCOSITY IS COHESION BETWEEN THE MOLECULES. AS THE TEMPERATURE OF A LIQUID INCREASES, ITS SURFACE TENSION DECREASES.THE VISCOSITY OF LIQUIDS REDUCE WITH INCREASE IN TEMPERATURE.
Answer: Option D. -> Methane
MINING ACCIDENTS CAN HAVE A VARIETY OF CAUSES, INCLUDING LEAKS OF POISONOUS GASES SUCH AS HYDROGEN SULFIDE OR EXPLOSIVE NATURAL GASES, ESPECIALLY FIREDAMP OR METHANE, DUST EXPLOSIONS, COLLAPSING OF MINE STOPES, MINING-INDUCED SEISMICITY, FLOODING, OR GENERAL MECHANICAL ERRORS.
MINING ACCIDENTS CAN HAVE A VARIETY OF CAUSES, INCLUDING LEAKS OF POISONOUS GASES SUCH AS HYDROGEN SULFIDE OR EXPLOSIVE NATURAL GASES, ESPECIALLY FIREDAMP OR METHANE, DUST EXPLOSIONS, COLLAPSING OF MINE STOPES, MINING-INDUCED SEISMICITY, FLOODING, OR GENERAL MECHANICAL ERRORS.
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