Question. A student was asked to mix the white of an egg with water and stir well. The student observed that
(a) a transparent solution is formed.
(b) a translucent mixture is formed.
(c) egg white settles down at the bottom.
(d) egg white floats on the surface of the water.
Question. A student by mistake mixed iron fillings and sulphur powder. He wanted to separate them from each other. The method you would advise him to use is dissolve the mixture in
(a) boiling water.
(b) cold water.
(c) carbon disulphide.
(d) kerosene.
Question. The colour of NO2 and PbO formed when lead nitrate is heated are :
(a) brown and green
(b) brown and yellow
(c) brown and colourless
(d) colourless and yellow
Question. Which of the following is the correct arrangement for separation of mixture of common salt and ammonium chloride?
Question. The spring balance shown here is used to measure the mass of given solid. The mass of the solid is
Question. Of the four experimental set-ups shown here to study temperature-time graph, the best one is
(a) A.
(b) B.
(c) C.
(d) D.
Question. For doing his experiment on verifying the laws of reflection of sound, a student sets up his apparatus as shown. The experiment is more likely is get performed successfully if the screen shown is a
(a) plane wooden board.
(b) wooden board with many holes in it.
(c) a foam padded board.
(d) a sheet of pure white cloth.
Question. Four students did their experiment on measuring the speed of a pulse through a string as follows :
Student A stretched his thick cotton string very taut and gave it a very mild transverse horizontal jerk
Student B stretched his thin jute string just taut and gave it a mild transverse horizontal jerk
Student C stretched his thick cotton string just taut and gave a strong transverse horizontal jerk
Student D stretched his thin jute string very taut and gave it a strong transverse horizontal jerk.
The best choice is that of student
(a) A
(b) B
(c) C
(d) D
Question. While observing a thin section of a plant stem, four students sketched sclerenchyma as given below. The correct diagram is
(a) A.
(b) B.
(c) C.
(d) D.
Question. A student wants to observe a spiracle of a cockroach. She should observe the region on its body shown by the label
(a) A.
(b) B.
(c) C.
(d) D.
Question. To observe starch granules in potato under a microscope, freshly cut surface of potato was pressed on a slide. The stain that will show starch granules clearly is
(a) methylene blue
(b) iodine
(c) safranine
(d) eosine
Question. Bottle A contains oxalic acid and bottle B contains sodium carbonate solution. When pH paper is dipped in each of the solutions, the colour seen in A and B respectively be
(a) orange, blue.
(b) blue, orange.
(c) green, blue.
(d) orange, green.
Question. The pair of safety symbols you notice on the bottles of commercial acetic acid available in the laboratory, is shown in
(a) I.
(b) II.
(c) III.
(d) IV
Question. When you place iron nail in copper sulphate solution, the reddish brown coating formed on the nail is
(a) soft and dull.
(b) hard and flaky.
(c) smooth and shining.
(d) rough and granular.
Question. Parallel rays from a distant tree incident on a convex lens form an image on the screen.
The diagram correctly showing the image of the tree on the screen is
(a) A.
(b) B.
(c) C.
(d) D.
Question. The positions of the pointers of the two ammeters A1 and A2, and two voltmeters V1 and V2 available in the laboratory are shown in the given figure. For an experiment to study the dependence of the current on the potential difference across a resistor, the student would prefer
(a) ammeter A1 and voltmeter V1.
(b) ammeter A2 and voltmeter V1.
(c) ammeter A1 and voltmeter V2.
(d) ammeter A2 and voltmeter V2.
Question. The correct way of connecting the ammeter and voltmeter with a series combination of two resistors in a cicuit for finding their equivalent resistance, is shown in diagram
(a) 1.
(b) 2.
(c) 3.
(d) 4.
Question. While preparing a temporary mount of stomata, four students used different stains given below
The correct stain was used by the student
(a) A
(b) B
(c) C
(d) D
Question. A part of de-strached leaf of a potted plant was covered with black paper strips on both sides and the plant was kept in sunlight for 8 hours. The leaf was then tested with iodine after boiling it in alcohol. Only the uncovered part of the leaf turned blue black. The inference is that
(a) CO2 is necessary for photosynthesis.
(b) light is necessary for photosynthesis.
(c) chlorophyll is necessary for photosynthesis.
(d) water is necessary for photosynthesis.
Question. In the experiment shown in the figure, water is found to rise in the bent tube. The reason is that
(a) CO2 in the bent tube dissolves in water.
(b) Partial vacuum is created in the flask.
(c) Atmospheric pressure outside is reduced
(d) Water in the bent tube rises due to capillary action.
SECTION - B
Question. Which of the following set of apparatus is required to determine the boiling point of water?
(a) tripod stand, conical flask, thermometer, wire guaze, stand with clamp, pair of tongs
(b) funnel, burner, test tube, thermometer, wire guaze, stand with clamp
(c) boiling tube, beaker, thermometer, burner, cork with one hole, stand with clamp, wire guaze
(d) round bottom flask, burner, thermometer, wire guaze, stand with clamp, cork with 2 holes, glass tube
Question. The readings of the spring balance will be
(a) equal to each other in all cases A, B and C.
(b) equal to each other in cases A and C only.
(c) equal to each other in cases B and C only.
(d) different in every case.
Question. A figure depicting parts of a neuron is given below. The correct identification of the labels 1, 2, 3, 4 respectively is
(a) dendrite, cytoplasm, Nissl granules, nerve fibre.
(b) cilla, endoplasmic reticulum, nucleoli, nerve fibre.
(c) dendrons, cell body, Nissl granules, axon.
(d) dendrites, cyton, nucleus, axon.
Question. Four experimental set ups are shown below to study the reaction of HCl and NaOH on zinc and sodium carbonate.
The set ups that would result in a rapid evolution of gas would be
(a) I and III
(b) II and IV
(c) I and II
(d) III and IV
Question. Which of the following is a correct observation when water is added to lime?
(a) No change and a hissing sound
(b) Vigorous bubbling and a hissing sound
(c) Slow bubbling with no sound
(d) Vigorous bubbling with evolution of heat and a hissing sound
Question. Four students showed the following traces of the path of a ray of light passing through a rectangular glass slab.
The trace most likely to be correct is that of student
(a) A.
(b) B.
(c) C.
(d) D.
Question. The following apparatus is available in a laboratory.
Cell : adjustable from 0 to 1.5 volt
Resistor : 4 Ω and 12 Ω
Ammeters : A1
A1 of Range 0 to 3 A1 : Least Count 0.1 A
A2 of Range 0 to 1 A : Least Count 0.05 A
Voltmeters : V1 of Range 0 to 10 V : Least Count 0.5 V
V2 of Range 0 to 5 V : Least Count 0.1 V
The best combination of voltmeter and ammeter for finding the equivalent resistance of the resistors in parallel would be
(a) ammeter A1 and voltmeter V1 .
(b) ammeter A1 and voltmeter V2 .
(c) ammeter A2 and voltmeter V1 .
(d) ammeter A2 and voltmeter V2.
Question. From the following diagrams, select the correct ones showing stages of binary fission in amoeba and budding in yeast in their proper sequence
(a) 5, 1, 4 and 2, 3, 6.
(b) 3, 4, 7 and 2, 8, 6.
(c) 7, 4, 1 and 3, 8, 6.
(d) 8, 7, 4 and 3, 2, 6.
Question. Student weighed 108 raisins and designated the weight as A. She then soaked them in 50 mL distilled water in a beaker. After 2 hours, she removed the raisins wiped them dry from outside and wighed again and called that weight as B. For determining the percentage of water obsorbed by raisins, she should calculate as follows :
