WorksheetsReflection
Total questions: 10
Worksheet time: 20mins
In order to determine the focal length of a concave mirror by obtaining the image of distant object on screen, the position of screen should be :
parallel to plane of concave mirror
perpendicular to plane of concave mirror
inclined at an angle 60° to plane of mirror
in any direction with respect to the plane of concave mirror
An object is placed at a distance of 10 cm in front of a plane mirror, then the distance of image from mirror will be
5 cm
10 cm
20 cm
0 cm
A ray of light is incident normally on the surface of water. Its angle of refraction in water is
90o
0o
180o
45o
Amoeba shows the following kind of nutrition
Autotrophic
Holozoic
Saprotrophic
Parasitic
The process by which blood is cleared of metabolic waste in case of kidney
Artificial kidney
Dialysis
Transplantation
Filtration
In human beings the process of digestion of food begins in
Stomach
mouth
Food pipe
Small intestine
The kidney in human being are part of the system for
Nutrition
respiration
Excretion
transportation
Which among the following is(are) double displacement reaction(s)?
(i) Pb + CuCl2 → PbCl2 + Cu
(ii) Na2 SO4 + BaCl2 → BaSO4 + 2NaCl
(iii) C + O2 → CO2
(iv) CH4 + 2O2 → CO2 + 2H2O
(i) and (iv)
(ii) only
(i) and (ii)
(iii) and (iv)
A blue litmus paper was first dipped in dil. HCl and then in dil. NaOH solution. It was observed that the colour of the litmus paper :
changed to red
changed to first red and then to blue
changed to blue to colourless
remained blue in both the solutions
The following reaction is used for the preparation of oxygen gas in the laboratory
2KClO3 (s) Heat , Catalyst 2KCl (s) + 3O2 (g)
Which of the following statement(s) is(are) correct about the reaction?
It is a decomposition reaction and endothermic in nature
It is a combination reaction
It is a decomposition reaction and accompanied by release of heat
It is a photochemical decomposition reaction and exothermic in nature
