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Wednesday, 12 February 2020

General Science: Questions and Answers (Chapter: 27)

General Science: Questions and Answers 
(Chapter: 27)

866. Which chemical is used for the preservation of a biological specimen?
Formalin 

867. What are the constituent elements of sugar? 
Carbon, Hydrogen and Oxygen

868. Which type of glass can cut off ultraviolet rays?
Crookes glass 

869. Which process is used in dairies to seperate cream from milk?
Centrifugation 

870. What colour phenolphthalein turns in the presence of bases? 
Pink

871. What colour is shown by a neutral solution in the universal indicator?
Green 

872. Which chemical acts as the chief agent in attracting mosquitoes to humans?
Lactic Acid 

873. Which chemical has the nickname of the Salt of Hartshorn'? 
Ammonium Carbonate

874. Which element is industrially produced through the Claus Process?
Sulfur 

875. What is known as 'the Magic Metal of Life'?
Calcium 

876. Which organism can travel in accordance with the magnetic field of the earth?
Snail 

877. Bessemer process is associated with the production of -----------------
Steel

878. What is the unit of potential difference? 
Volt

879. What is known as 'the Metal of the Future'
Titanium

880.The Electromotive force (emf) of a voltaic cell: 
1 volt

881. The instrument used to measure the thick¬ness of ozone:
Dobsonometer 

882. The metal present in chloroplast:
Magnesium

883. The whitest compound is ever known:
Titanium dioxide 

884. Rigid Stiffening of muscles shortly after death is called 
Rigor Mortis. 

885. Rings around the sun is due to
diffraction 

886. Sal ammoniac
-Ammonium Chloride 

887. The scientist who discovered that the body of the animal is made up of cells
- Theodor Schwann 

888. The scientist who discovered that the body of the plant is made up of cells 
-  M.J. Schleiden

889. Sclerometer is used to measure the 
- hardness of materials.

890. .............. is used to coat the photocopying drum of the Xerox machine. 
- Selenium

891. Skating on ice is possible due to the phenomenon of :
regelation. 

892. The skeletal system of the cell -
- Endoplasmic Reticulum 

893. ..................... is used as a preservative to prevent spoilage of squashes and jams.
- Sodium Benzoate

894.................... is the time of the year when the difference between the length of days and length of nights is the longest.
- Solstice

895. The spherical shape of raindrops is due to 
- Surface Tension

896. Spondylitis affects 
- spinal cord.

897. Star appears to be twinkling due to 
- refraction

898. Stress hormone in the plant is 
- Abscisic acid

899. Study of cells 
- Cytology 

900. The substance which is known as 'Supercooled liquid' is 
- glass. 

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