| Post Name | Laboratory Assistant Common Facility Service Centre |
|---|---|
| Department | Industries and Commerce Category No : 057/2019 |
| Question Paper Code | 019/2023/OL |
| Category Code | 057/2019 |
| Date of Test | 5 April 2023 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Which of the following is not an SI unit ?
Answer
D. Hour
2
A person standing at point A travels to point B and then travelled back to A. Then the
Answer
C. Displacement is zero but distance travelled is not zero
3
SI unit of speed and velocity are
Answer
A. Same
4
Area under the velocity-time graph of a moving object gives
Answer
B. Displacement of the object
5
A car can accelerate through a road because of which external force ?
Answer
C. Frictional force of the road
6
A cricket player draws his hands backwards while catching a fast ball to
Answer
A. reduce the rate of change of momentum
7
According to which law we say force always occur in pairs ?
Answer
C. Newtons third law
8
The force experienced by Earth due to Sun is along the vector joining the two and hence it is a
Answer
A. Central force
9
Who proposed the universal law of gravitation ?
Answer
D. Newton
10
A person jumped out of an airplane flying at high altitude will experience
Answer
B. Weightlessness
11
Examples of fluids are
Answer
C. All liquids and gases
12
When an object is submerged in a liquid at rest, the force exerted by the liquid on the object will be
Answer
A. Always normal to the object surfaces
13
The pressure P at a depth h below the surface of a liquid having density ρ, open to the atmosphere is greater than the atmospheric pressure by an amount
Answer
C. P = hρg
14
Hydraulic brakes work on the principle of
Answer
A. Pascal's law
15
The SI unit of viscosity is
Answer
D. N s m⁻²
16
What is the work done during the time when a weightlifter holding a 100 kg mass steadily on his shoulder for 5 second ?
Answer
D. Zero
17
36 km/h is equal to
Answer
B. 10 m/s
18
The rate at which work done is
Answer
A. Power
19
A virtual and erect image of the same size as that of the object is always formed by a
Answer
C. Plane mirror
20
What will be the height of the image if an object of height 4 cm is placed in front of a concave mirror at a distance 10 cm away from it and the image is formed 20 cm away from the mirror ?
Answer
D. 8 cm and inverted
21
Field of view is maximum for
Answer
B. Convex mirror
22
As per the new cartesian sign convention, object and image distances for a spherical mirror is taken with respect to the origin as
Answer
C. Pole of the mirror
23
Refractive index of normal optical materials is always
Answer
A. Greater than one
24
The principle of light propagation through an optical fiber is
Answer
D. Total internal reflection
25
The SI unit of power of a lens is
Answer
B. Dioptre
26
When we look at nearer objects, lenses in our eyes are contracted and
Answer
A. Curvature of the lens increases and focal length decreases
27
The persistence of vision for human eye is approximately
Answer
B. 1/16 s
28
Mechanical waves are
Answer
C. Can be either longitudinal or transverse
29
Distance between two consecutive points with the same phase of a wave is
Answer
D. Wavelength
30
Acoustic echo happens due to
Answer
A. Reflection of sound
31
According to Joule's law, the heat generated in a current carrying conductor is given by
Answer
A. I²Rt
32
If two equal resistances R and R are connected in series and parallel configurations, then which statement is correct ?
Answer
B. Effective resistance of parallel combination is R/2
33
Alloy of tin and lead is generally used as fuse wires because
Answer
B. It has low melting point
34
Electric power consumed by an electrical appliance can be measured using
Answer
C. Using a voltmeter and an ammeter
35
In an AC generator, the insulated conducting wire wound on a soft iron core is called
Answer
D. Armature
36
If a transformer has 500 turns in its primary and 5000 turns in secondary, what will be the secondary voltage, if the primary voltage is 5 V
Answer
A. 50 V
37
Transmission loss during the distribution of electricity from power stations is generally reduced by
Answer
A. Decreasing the current and increasing the voltage
38
In an agricultural field a 750 W water pump is used for 3 hours every day. The daily consumption shown by the watt hour meter will be
Answer
D. 2.25 unit
39
Magnetic field due to a current flowing through a circular loop is proportional to
Answer
C. Both (1) and (2)
40
In terms of working principle, which one among the following is different from others ?
Answer
C. Microwave oven
41
Electron was discovered by
Answer
B. J J Thomson
42
The chargeless particle present inside the nucleus of an atom is
Answer
C. Neutron
43
The atomic number of an atom is
Answer
A. Number of electrons/protons in an atom
44
The atomic number of an atom is 17 and mass number is 35. The number of protons, neutrons and electrons in the atom respectively are
Answer
D. 17, 18, 17
45
Among the following, which pair of atoms are isobars
Answer
A. ⁴⁰₂₀Ca and ⁴⁰₁₈Ar
46
How many groups and periods are there in modern periodic table ?
Answer
D. 18 groups and 7 periods
47
The inert element among the following is
Answer
C. Helium
48
The main shell electronic configuration of Fluorine atom is (Atomic number of Fluorine = 9)
Answer
B. 2, 7
49
Trend of atomic size along the period and down the group.
Answer
B. Decreases along the period and increases down the group
50
Choose the correct pairs of elements with symbol (i) Magnesium - Mg (ii) Aluminium - Ar (iii) Chlorine - Cl (iv) Potassium - Pt
Answer
C. Only i and iii
51
The oxidation state of H in metal hydrides is
Answer
D. −1
52
Catalyst used in the synthesis of sulphuric acid is
Answer
D. Vanadium pentoxide
53
The bond present in NaCl is
Answer
A. Ionic bond
54
The sour taste of tamarind is due to the presence of
Answer
C. Tartaric acid
55
NaOH + HCl A + B. Identify A and B
Answer
A. A is NaCl and B is
56
The major mineral present in Chavara barrier beach in Kerala which is used for the manufacturing of is
Answer
D. Ilmenite
57
The ore of some metals are given below. Pick the correct match.
Answer
A. Al - Bauxite
58
The most abundant element in earth's crust is
Answer
C. Oxygen
59
The depletion of ozone layer is caused by
Answer
B. Chlorofluorocarbons
60
Chlorine is prepared in the laboratory by heating
Answer
A. and concentrated HCl
61
Pick the correct statement about allotropes i. Compounds having same physical properties and different chemical properties. ii. Different forms of same element. iii. Compounds having different physical properties and same chemical properties. iv. Same forms of different elements.
Answer
C. Only ii and iii
62
The process of increasing atmospheric temperature as a result of increase in the amount of carbon dioxide in the atmosphere is called
Answer
B. Greenhouse effect
63
Find A and B in the following chemical reaction
Answer
A. A is HCl and B is
64
Graphite is a good conductor of electricity. Which of the following statement justify your answer ?
Answer
B. Presence of free electron in graphite
65
When a person inhale Carbon monoxide, the haemoglobin present in his blood reacts with carbon monoxide and form a compound which decreases the oxygen carrying capacity of haemoglobin and the person may die. Name the compound formed
Answer
C. Carboxy haemoglobin
66
Pick the correct statement about hydrocarbons
Answer
D. Hydrocarbons contains carbon and hydrogen
67
The IUPAC name of the organic compound | is
Answer
B. 3-methylheptane
68
Identify the wrong pair among the following (i) Alkane - hexane (ii) Alkene - ethene (iii) Alkyne - (iv) Branched hydrocarbon - 3-methylpentene
Answer
C. (iii)
69
COOH is the functional group present in
Answer
D. Carboxylic acids
70
Marsh gas is
Answer
B. Methane
71
To prevent the misuse of ethanol as a beverage, it is mixed with poisonous compounds to make use it in industries. The resulting product is called
Answer
C. Denatured spirit
72
In a homologous series each member differs in composition from one another by one
Answer
A. group
73
When heated at , methane is decomposed to a finely divided powder which is used in making printer's ink. What is the name of that powder ?
Answer
C. Carbon black
74
The gaseous hydrocarbon used for welding of metals is
Answer
D. Acetylene
75
Absolute alcohol contains
Answer
B. 99% ethanol
76
The monomer of natural rubber is
Answer
D. Isoprene
77
Saritha had fever and doctor advised her to take paracetamol 500 tablets thrice a day, because paracetamol is a
Answer
C. Antipyretic
78
NPK value of a fertilizer is 10 : 5 : 20. What does it mean ?
Answer
C. The fertilizer contains 10% N, 5% and 20%
79
The natural polymer among the following is
Answer
B. Cellulose
80
Which vitamin is called as sunshine vitamin ?
Answer
D. Vitamin D
81
Colloidal stability of natural rubber latex is imparted by ________ layer around the rubber particles.
Answer
C. Phospholipo proteinic
82
The species name of Guayule rubber producing plant
Answer
B. Parthenium argentatum
83
Charles Goodyear invented the vulcanization of rubber in
Answer
B. 1939
84
Identify the mixing mill size most suitable for laboratory uses
Answer
A. 6” × 12” or 6” × 13”
85
Insert imbedded rubber articles in multiple numbers in a single moulding is usually accomplished using __________ technique.
Answer
B. Transfer moulding
86
PET bottles are manufactured using ________ process.
Answer
D. Stretch Blow Moulding
87
Choose the ASTM standard for vulcanized rubber properties in tension
Answer
B. ASTM D 412
88
From 3° arc oscillating disc rheograph, the scorch safety time is taken as time taken for _______ unit rise in torque from minimum.
Answer
D. 2
89
In compression set test under constant deflection of vulcanized rubber samples, the specimen is compressed to _________ of its actual height.
Answer
C. 25%
90
The standard for methods of test for vulcanized rubber according to BIS
Answer
A. IS 3400
91
In the tear test of rubber samples, maximum strength is obtained when the sample direction is ______ to the compound milling direction.
Answer
C. Perpendicular
92
In ross flexing test the rubber sample is repeatedly flexed about the cut portion through ____ angle.
Answer
D. 90°
93
MFI test is used to compare _________ with in a thermoplastic polymer type.
Answer
B. Grades
94
The moles of a solute in relation to the mass of the solution is known as
Answer
A. Molality
95
Choose the chemical that dissolves in water rises ion concentration in the solution
Answer
C. Acids
96
The coagulum prepared for DRC determination of NR latex is dried at _____ in a hot air oven.
Answer
A. 70 ± 2°C
97
The indicator used in the determination of alkalinity of latex when 0.1 N HCl used as titrant
Answer
D. Methyl red
98
The difference between DRC and TSC is known as
Answer
B. Non-rubber content
99
During MST determination the mechanical stirring is done at
Answer
A. 14000 ± 200 rpm
100
The maximum Ash content in percentage permitted in ISNR - 10 as per BIS specification
Answer
C. 0.75
Discussion
Ask a doubt or share a tip.
No comments yet — start the discussion.