Series LRH/2 Test Booklet Code : A
PRACTICAL SKILLS IN SCIENCE
TEST BOOKLET Maximum Marks :20
SECTION A
1.A student added fine sand, white of an egg, starch paste and common salt separately to water kept in four separate beakers. He stirred the mixture well and filtered each of them. He would obtain a solid residue on the filter paper in the case of
(1) fine sand
(2) white of an egg
(3) starch paste
(4) common salt
2.The colour of iron powder and sulphur powder respectively is
(1) green, white
(2) white, green
(3) yellow, black
(4) black, yellow
3.Four students used different methods for heating magnesium ribbon as shown below. The correct method is followed by -
(1) Student I
(2) Student II
(3) Student III
(4) Student IV
4.Which one of the following experimental arrangements is correct for the determination of boiling point of water ?
5.In the experiment on verifying the ‘laws of reflection of sound’ as shown in the given figure, the angle of incidence (< i) and the angle of reflection (< r) correspond, respectively, to the angles
(1) < MNH and < LNK
(2) < MNH and < LNP
(3) < MNP and < LNK
(4) < MNP and < LNP
6.Four students use the following ‘combinations’ in their experiment on determining the density of a given metal :
Student A : Uses a hollow metal sphere (volume -- 5 mL) and a measuring cylinder of capacity 50 mL and least count 1 mL.
Student B : Uses an irregularly shaped metal piece (volume - 5 mL) and a measuring cylinder of capacity 100 mL and least count 2 mL.
Student C : Uses a hollow metal sphere (volume - 5 mL) and a measuring cylinder of capacity 100 mL and least count 2 mL.
Student D : Uses an irregularly shaped metal piece (volume - 5 mL) and a measuring cylinder of capacity 50 mL and least count 1 mL.
The result is likely to be best for student
(1) A (2) B
(3) C (4) D
7.In the experiment to find the loss in the weight of a solid, a student, in the first step, suspends the solid from the hook of a spring balance. In the second step, he immerses the solid in tap water and in the third step, in saturated salt solution. In which step does he find the pointer of the spring balance in the highest position and in which step in the lowest position ?
(1) Lowest in the first step and highest in the second
(2) Lowest in the third step and highest in the first
(3) Lowest in the first step and highest in the third
(4) Lowest in the second step and highest in the first
8.A student is to plot a temperature time graph by measuring the temperature of hot water as it cools. He proceeds step-wise as under
A. He takes a very small quantity of water.
B. The initial temperature of the water is about 40° C above the room temperature.
C. He keeps on stirring the water briskly.
D. He notes the temperature of water after every 3 minutes throughout the experiment.
E. He keeps the fan on during the experiment.
Which of the above steps are not correct ?
(1) A and B only
(2) A, B and D
(3) A, C, D and E
(4) B, C and D
9.Pick out the incorrect labelling in the given diagram of the nerve cell.
(1) Nucleus
(2) Cyton
(3) Dendrite
(4) Cilia
10.In the figure of the bony fish given here, the part marked ‘X’ should be labelled correctly as
(1) operculum (2) gill membrane
(3) pectoral fin (4) bony scale
11.In the experiment to prove that light is necessary for photosynthesis, which one of the following is not required ?
(1) Alcohol (2) Iodine
(3) KOH (4) Water
12.A student was provided with a pH chart by the teacher and asked to observe the colours corresponding to pH 1 and 14 respectively. The correct answer would be
(1) yellow, green (2) violet, orange
(3) red, blue (4) blue, mustard
13.A student added dilute HCl to Zn granules taken in a test tube. The correct observation would be
(1) Zn granules turned green (2) formation of a precipitate
(3) evolution of gas (4) no change
14.When a cleaned iron nail is placed in copper sulphate solution, the colour of solution changes to
(1) blue (2) red
(3) pale violet (4) pale green
15.In the set-up shown below, a clear image of a distant object is obtained on the screen. The focal length of the concave mirror is
(1) 11.4 cm
(2) 9.4 cm
(3) 9.8 cm
(4) 9.9 cm
16.Out of the four given circuits for studying the dependence of the current on the potential difference across a resistor, the circuit that has been correctly drawn, is circuit
17.A student has correctly set up the circuit for finding the equivalent resistance of two resistors in parallel.
Each terminal of each of the two resistors, in this circuit, would be connected to
(1) only one more component in the circuit
(2) at least two more components in the circuit
(3) at least three more components in the circuit
(4) at least four more components in the circuit
18.A chain of yeast cells forms because
(1) yeast cells do not separate after budding
(2) daughter cells are unable to survive without parent cells
(3) buds reproduce as soon as they are formed
(4) daughter cells stick together with the help of mucus
19.When iodine was added to a particular vegetable which had been crushed into a paste, blue-black colour was obtained. This indicates the presence of
(1) glucose (2) sugar
(3) starch (4) protein
20.The part marked R in the given diagram is
(1) sporophyte
(2) spirally arranged leaves
(3) oppositely arranged leaves
(4) branches
SECTION B
21.A student was asked by the teacher to separate sand from a mixture of sand and common salt, while using the set-up of apparatus as shown below. In which positions labelled A, B, C and D, would he find sand and common salt respectively ?
(1) A, B (2) C, A
(3) B, D (4) D, C
22.A 2 m long string is given a strong transverse horizontal jerk. The resulting pulse is observed to complete 5 journeys along its length before fading out. The initial and final readings, on a stop clock used in the experiment, are as shown. The speed of the pulse, through the string, is
(1) (2/9) ms 1
(2) (2/10) ms 1
(3) (2/45) ms 1
(4) (2/50) ms 1
23.In the diagram of stomata shown below, the labelling of four students was tabulated by the teacher in the table given below. Whose labelling was correct ?
| Student | Nucleus | Stoma | Epidermal Cell | Cell Wall |
| a | IV | III | II | I |
| b | II | IV | I | III |
| c | I | II | III | IV |
| d | III | I | IV | II |
24.In order to adjust the compound microscope a slide, the following steps are required :
I. Adjust to high power
II. Place the slide on the stage
III. Focus using low power
IV. Adjust the mirror and diaphragm so that there is even illumination
The correct sequence of steps is
(1) IV, II, III, I
(2) II, III, I, IV
(3) III, IV, II, I
(4) II, III, IV, I
25.A student took Cu, Al, Fe and Zn strips separately in four test tubes labelled I, II, III and IV. He added 10 mL of freshly prepared ferrous sulphate solution to each test tube as shown below
Black residue would be obtained in test tubes
(1) I and II
(2) I and III
(3) II and III
(4) II and IV
26.Which of the following pairs of safety symbols are marked on the bottles of commercial acetic acid available in the laboratory ?
(1) I (2) II
(3) III (4) IV
27.In an experiment to trace the path of a ray of light passing through a rectangular glass slab, four students tabulated their observations as given below :
| Student--> | A | B | C | D |
| < i | 30° | 30° | 30° | 30° |
| < r | 18° | 20° | 17° | 21.5° |
| < e | 32° | 32.5° | 30° | 34.50° |
Which student performed the experiment most correctly ?
(1) A
(2) B
(3) C
(4) D
28.A student sets up her circuit, for finding the equivalent resistance of a series combination of two given resistors R1 and R2, in the manner as shown. She did not obtain the correct results in her experiment because of a mistake in her circuit. This mistake can be corrected by shifting the
(1) voltmeter and connecting it across P and Q
(2) ammeter and connecting it between K and T
(3)voltmeter and connecting it across T and P with correct polarity
(4) ammeter and connecting it across P and Q
29.
The following precautions were listed for the experimental set-up shown to prove that carbon dioxide gas is given out during respiration were:
A. The stoppered flask should be airtight.
B. The seeds should be immersed in water.
C. There should be a regular supply of oxygen for respiration of seeds.
D. The germinating seeds should be moist.
The correct precautions are
(1) A and B
(2) B and C
(3) C and D
(4) A and D
30. If the water absorbed by soaked raisins is 50% then the weight of raisins before soaking in water (W1) and the weight of raisins after soaking in water (W2) might have been
(1) W1=20g and W2=30g
(2) W1 = 30 g and W2=50g
(3) W1 50 g and W2 = 100 g
(4) W1 = 05 g and W2 = 25 g