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Wednesday, 12 February 2020

General Science: Questions and Answers (Chapter: 29)

General Science: Questions and Answers 
(Chapter: 29)

931. The element stored in oil due to its high reactivity 
- Barium

932. The element which has the highest reactivity or electronegativity
- Fluorine 

933. The element which has the highest ionization potential 
- Helium. 

934. The element which has the least ionization energy 
- francium. 

935. The element with the highest melting point 
-carbon. 

936. The elements with the most number of isotopes
- tin. 

937. The escape velocity of moon is 
- 2.4 km/s -Earth - 11.2 km/s (7 miles/s. )(Jupiter: 59.6km/s)

938. The first portable computer 
- Osborne-I

939. A tachometer is a device to measure
- speed of rotation. 

940. A vehicle silencer works on the principle of' Destructive Interference' of 
- sound waves 

941. Alkaloids are a group of nitrogen-containing organic compounds produced by 
- plants

942. The alloy used for making permanent magnet is 
- Alnico.

943. An active galactic nucleus is called a 
- quasar.

944. Animals living in the bottom of water are called 
- benthic animals.

945. Approximately 111 Km is represented by
1⁰ latitude.

946. Average human respiratory rate 
- 16-20 breaths/min

947.  Average respiratory rate in a newborn baby
- 44 breaths/min

948. ----------------- is observed on October 23, from 6.023 am to 6.023 pm 
- Avogadro day

949.  .................... is the unit of radioactive decay. 
- Becquerel

950.  .................... is a mixture of an alkaline solution of Copper sulphate and Sodium citrate. 
- Benedict's solution

951. Bismuth Aurite is the mineral of 
- gold.

952. The blue colour of the Sea was explained by 
- Sir. C. V. Raman

953. The blue colour of the sky was explained by 
- Lord Rayleigh 

954. Bosons which carry the strong nuclear force 
- Gluons

955. Bright's disease affects 
- kidney.

956. ...................... prevent the changes in ph caused by the addition of acid or alkali.
- Buffer solution

957. ......................... is the upward force which acts on a body immersed in liquid.
- Buoyant force

958. Calomel 
-Mercurous chloride 

959.Candy fluid Potassium 
- Permanganate. 

960. ..................... is the working principle behind the washing machine. 
- Centrifugation

961. Chemical decomposition by the action of heat is known as 
- Pyrolysis

962. The chemical name of vitamin B5 is Pantothenic acid and vitamin C is
- Ascorbic acid. 

963. The compound of sodium used as a purifier in submarines 
- Sodium Peroxide

964. Desert sand is usually composed of 
- calcite.

965. Diamond is the hardest form of carbon and lamp black is the softest form of 
- carbon. 

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