IDEAL QUESTION PAPER : 7
(1) The wavelength of ultraviolet rays is....
(1) 800 nm to 0.3 mm
(2) 400 nm to 800 nm
(3) 300 pm to 400 nm
(4) 3 pm to 300 pm
Ans-(3) 300 pm to 400 nm
(2)Which scientist made the first use of telescope for space observation?
(1) Galileo
(3) Newton
(2) Archimedes
(4) Edison
Ans-(1) Galileo
(3) The silk worms reared for silk production feed on plants.
(1) grass
(2) hibiscus
(3) mulberry
(4) rose
Ans-(4) rose
(4)is called the father of white revolution.
(1) Swaminathan
(2) Tribhuvandas Patel
(3) Dara Khurody
(4) Verghese Kurien
Ans-(4) Verghese Kurien
(5) Which of the following compound is not present in the smoke of tobacco?
(1) Pyridine
(2) Carbon monoxide
(3) Glucose
(4) Nicotine
Ans-(3) Glucose
(6) The person affected by sickle cell anaemia should take one tablet of everyday.
(1) Thiamine
(2) Folic acid
(3) Ascorbic acid
(4) Niacin
Ans-(2) Folic acid
(7) Hormone Thymosin is secreted by ..... gland.
(1) Thymus
(2) Testis
(3) Adrenal
(4) Parathyroid
Ans-(1) Thymus
(8) The chemical control in the human body is done by
(1) Nervous system
(2) Spinal cord
(3) Haemoglobin
(4) Hormones
Ans-(4) Hormones
(9) Proper coordination between various systems of an organism helps to maintain a state of equilibrium called
(1) randomness
(2) reflex action
(3) homeostasis
(4) Dialysis
Ans-(3) homeostasis
(10) invented artificial dye.
(1) Guerlain
(2) William Henry Perkin
(3) Hans Schwarzkopf
(4) Johnson
Ans-(2) William Henry Perkin
(11) Onions and potatoes are irradiated with gamma rays from ..... to prevent their sprouting.
(1) Iridium-192
(2) Krypton-85
(3) Strauntium-90
Ans- (4) Cobalt-60
(12) Main constituent of biogas is
(1) ethane
(2) butane
(3) methane
(4)carbon monoxide
Ans-(3) methane
(13) To prepare aerated drinks----- gas is used.
(1) oxygen
(2) nitrogen
(3) methane
(4) carbon dioxide
Ans- (4) carbon dioxide
(14) A wave of wavelength 3 cm is travelling with the speed of 330 m/s through the air. What is its frequency?
(1) 11000 Hz
(2) 990 Hz
(3) 110 Hz
(4) 1100 Hz
Ans-(1) 11000 Hz
(15) As compared to speed of sound on earth, what will be the speed of sound on moon?
(1) 6 times 1
(2) times
(3) Half
(4) Zero times
Ans-(4) Zero times
(16) The focal length of a concave mirror is 20 cm. If object is placed at a distance of 40 cm from the mirror, what will be the magnification?
(1)0
(2)-1
(3) 1
(4) 2
Ans-(2)-1
(17) The height of a person is 172 cm. What should be the minimum height of the plane mirror to get full image of the person?
(1) 172 cm
(2) 129 cm
(3) 86cm
(4) 43 cm
Ans-(3) 86cm
(18) Under the valuable guidance of the scientist ...., the Param computer was made. (1) Dr. Jayant Narlikar
(2) Dr. Vasant Govarikar
(3) Dr. Narendra Jadhav
(4) Vijay Bhatkar
Ans-(4) Vijay Bhatkar
(19) Which of the following waste takes maximum time to decompose?
(1) Skins of fruits
(2) Stalks of vegetables
(3) Plastic bags
(4) paper bags
Ans-(3) Plastic bags
(20) Which of the following activity is harmful for waste management?
(1) Reduce
(2) Use and throw
(3) Recycle
(4) Reuse
Ans-(2) Use and throw
(21) Find the odd member out:
(1) Ringworm
(2) Cholera
(3) Leprosy
(4) Pneumonia
Ans-(1) Ringworm
(22) Oil spills in oceans are cleaned with the help of
(1) Alcanivorax
(2) Clostridium
(3) Staphylococci
(4) Streptococci
Ans-(1) Alcanivorax
(23) The process of decomposition of parts of dead organisms and release of ammonia is called
(1) Fixation
(2) Nitrification
(3) Denitrification
(4) Ammonification
Ans-(4) Ammonification
(24) d. r. The ...... gas is found in atmosphere in greatest proportion.
(1) oxygen
(3) carbon dioxide
(2) nitrogen
(4) hydrogen
Ans-(2) nitrogen
(25) Banyan tree is a-----type of plant.
(1) Thallophyta
(2) Bryophyta
(3) Pteridophyta
(4) Angiosperms
Ans-(4) Angiosperms
(26) In..... type of plants, are absent. conducting tissues
(1) Bryophyta
(2) Pteridophyta
(3) Gymnosperms
(4) Angiosperms
Ans-(1) Bryophyta
(27) The concentration of H' ions formed by the dissociation of pure water at 25° C Is
(1) 107 mole/litre
(2) 10-7 mole/litre
(3) 7 mole/litre
(4) 14 mole/litre
Ans-(2) 10-7 mole/litre
(28)The aqueous solution of which of the following compounds is non-conductor of electric current?
(1) Copper sulphate
(2) Common salt
(3) Urea
(4) Sulphuric acid
Ans-(3) Urea
(29) Find the odd member the was out:
(2) Ammonium radical
(1) Hydrogen ion
(3) Cobalt ion
(4) Nitrite radical
Ans-(4) Nitrite radical
(30) 'X' is a negative radical and its valency is 2. What will be the molecular formula of its compound with calcium?
(1) CaX
(2) CaX
(3) XCa
(4) CaX
Ans-(1) CaX
(31) Which of the following formulas is incorrect?
(1)R= A
(2)g=RA
(3) L = SA
(4) A = SL R
Ans-(3) L = SA
(32) In a circuit, 3 electric cells of 6 V each are connected. The resistance of circuit is 5 ohm. So, the current flowing through the circuit is ..... Ampere. ful
(1) 3.6
(2) 1.2
(3) 30
(4)
Ans-(1) 3.6
(33) An object of mass 5 kg falls freely from a height of 10 m. After just touching the ground, its kinetic energy becomes zero in 0.1 second. What is the force exerted by the object on the ground?
(1) 4900 N
(3) 700 N
(2) 49000 N
(4) 49 N
Ans-(3) 700 N
(34) The kinetic energy of an object of mass 10 kg moving with a velocity of 5 m/s is..J. (1)250
(2) 125
(3) 50
(4) 25
Ans-(2) 125
(35) Anish is moving along the circumference of a circular ground whose radius is 70 m. If he completes half round, what is its displacement from his original position?
(1) 140 m
(2) 220m
(3) 440m
(4) 300 m
Ans-(1) 140 m
HINTS FOR DIFFICULT QUESTIONS
(14) Velocity = wavelength x frequency .
.. 330 = 0.03 x frequency
frequency = 11000 Hz (35
.:. Option 1 is correct.
(15)As there is no atmosphere on the moon, sound cannot propagate because sound requires material medium for propagation.
..Option 4 is correct.
(16) Focal length is 20 cm means the object is on the centre of curvature (R = 2f). In such case, image is real and inverted and of the same size as the object. So magnification will be -1. (2) ...
Option 2 is correct.
(21) Ringworm is caused due to a fungus and others are caused by bacteria. So,
.Option is correct.
(29) Nitrite radical is negatively charged while others are positively charged.
.:. Option is correct.
(32) V = 6 x 3 = 18 V, R = 5 ohm.
V 18 = 3.6 Ampere.
Option is correct.
(33) The initial P.E. of the object = SS J. 490 J mgh 5 x 9.8 x 10 Its kinetic energy when it just touches the ground = 490 J 1 2 mv² = 490 1 x 5 x v² = 490 v² = 196 .. v = 14 m/s ... The momentum of the object = m x v = 5 x 14 = 70 kgm/s ... Change in momentum = 70-0 = 70 kgm/s Force = Change inmomentum 70 0.1 = 700 N. time ..
Option 3 is correct.
(34) Κ.Ε. = 1 mv² = 2 1 x 10 x 52 = 125 J. .. Option 2 is correct.
(35) Anish completes half round, so its displacement is equal to the diameter of the ground. Diameter = 2 x 70 = 140 m. ..
Option is correct.
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