41. A safety device used to protect the electric circuit and electric appliances is
A. ammeter B. fuse C. commutator D. galvanometer
Ans: B. fuse
Solution:
An ammeter is a device (instrument) used for measuring electric currents in ' circuits.
Fuse is a safety device used to protect the electric circuit and electric appliances
commutator or split ring is to change the direction of current through coil after every half rotation.
A galvanometer is a device (instrument) used for detecting currents in a circuit.
42. The position of the image obtained by a convex lens when an object is kept between F1 and 2F1 (F: principal focus of the convex lens)
A. between F2 and 2F2 B. at 2F2
C. beyond 2F2 D. at infinity
Ans: beyond 2F2
Solution:
Ans: A. Solar power plant
Solution:
There are many different types of electricity generators that do not use turbines to generate electricity. The most common in use today are solar photovoltaic (PV) systems and internal combustion engines. Solar photovoltaic cells convert sunlight directly into electricity.
44. An electric lamp whose resistance is 20 Ω and a conductor of 4 Ω resistance are connected in series to a 6V battery as shown in figure. Then the total current flowing through the circuit is
A. 36A Ω B. 0.6A C. 4A D. 0.25A
Ans: D. 0.25A
Solution:
Given, Voltage of the battery, V = 6V
Resistance of electric lamp, R1 = 20Ω
Resistance of series conductor, R2 = 4Ω
a) Total resistance in the circuit, Rs = R1+ R2 = 20Ω + 4Ω = 24Ω.
(b) Using Ohm's law,
Current through the circuit is
I = V/Rs
I = 6v/24Ω. = 0.25A
45. In Fleming’s right hand rule middle finger indicates direction of the
A. electric current induced in a conductor
B. movement of the conductor
C. magnetic field
D. electric current
Ans: A. electric current induced in a conductor
Solution:
Ans: B. S
Solution:
Ans: C. half revolution
Solution:
If a rectangular coil of copper wire is rotated in a magnetic field, the direction of magnetic field to the given side of coil changes after half revolution and the direction of induced current also changes simultaneously.
48. A major component of biogas is
A. ethane B. methane C. butane D. propane
Ans: B. methane
Solution:
Biogas refers to a mixture of gases produced by the anaerobic decomposition of organic matter such as agricultural waste, municipal waste, plant residue, food waste etc.
Biogas is usually made up of around 50-70% methane (CH4) and 25-45% carbon dioxide (CO2), with other gases such as hydrogen (H2), hydrogen sulphide (H2S), water vapor (H2O), nitrogen (N2), oxygen (O2), ammonia (NH3) making up the rest.
49. One of the properties of concave lens is, it
A. diverges the light rays
B. forms real and inverted image
C. is thinner at the edges and thicker at the middle
D. converges the light rays
Ans: A. diverges the light rays
Solution:
| Appearance | A concave lens is thinner in the middle and thicker at the edges. | A convex lens is thicker in the middle and thinner at the edges. |
| Also known as | It is also known as Diverging Lens | It is also known as Converging Lens |
| Focal Length | Negative Focal Length | Positive Focal Length |
| Incident Rays | It diverges the incident rays away from the principal axis. | It converges the incident rays towards the principal axis. |
50. An electric bulb is connected to a 220V generator. If the current flowing in the bulb is 0.50A. The power of the bulb is
A. 44W B. 1100W C. 110W D. 220W
Ans: C. 110W
Solution:
Given as, Voltage V = 220 V
Current I = 0.05 A
And we know that
51. The function of ammeter in an electric circuit is, it
A. reverses the direction of the current
B. measures rate of electric current
C. protects electrical appliances
D. measures the potential difference
Ans: B. measures rate of electric current
Solution:
reverses the direction of the current - Commutator
measures rate of electric current - Ammeter
protects electrical appliances - Fuse
measures the potential difference - Voltmeter
52. As the electrical resistivity of a substance increases
A. resistance decreases B. conductivity increases
C. melting point decreases D. resistance increases
Ans: D. resistance increases
Solution:
As the electrical resistivity of a substance increases, resistance also increases and conductivity decreases
53. The phenomenon of bending of light as it passes from one transparent medium to another is
A. refraction of light B. reflection of light
C. internal reflection of light D. lateral inversion of light
Ans: A. refraction of light
Solution:
The phenomenon of bending of light as it passes from one transparent medium to another is refraction of light
Reflection of light is the phenomenon of bouncing back of light in the same medium on striking the surface of any object.
54. Which of the following is NOT a property of magnetic lines?
A. magnetic field lines are dense near poles
B. magnetic field lines are closed loops
C. magnetic field lines intersect each other
D. magnetic field lines emerge from north pole and merge at the south pole
Ans: C. magnetic field lines intersect each other
Solution:
- Each line is a closed and continuous curve.
- They originate from the north pole and terminate at the south pole.
- They will never intersect each other.
- They are crowded near the poles where the magnetic field is strong.
Ans: D. moist carbondioxide
Solution:
Ans: B. 9 and 3
Solution:
Ans: D. carbon dioxide
Solution:
When dilute hydrochloric acid reacts with sodium carbonate, then sodium chloride, carbon dioxide and water are formed. A brisk effervescence is seen in the release of carbon dioxide.
Na2CO3(s) + 2 HCl → 2NaCl(aq) + CO2(g) + H2O(l)
A. C3 H6 B. C3 H8 C. C3 H4 D. C2 H6
Ans: A. C3 H6
Solution:
Ans: D. sodium hydroxide solution
Solution:
Base substance changes colour of Red litmus into blue.
Acid substance changes colour of Blue litmus into red.
sodium hydroxide solution is a basic solution which turns red litmus to blue
60. The amphoteric oxide among the following is
A. sodium oxide B. zinc oxide
C. calcium oxide D. potassium oxide
Ans: B. zinc oxide
Solution:
An amphoteric compound is a molecule or ion that can react both as an acid as well as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation state of the oxide.
Zinc oxide (ZnO) reacts with both acids and with bases:
In acid: ZnO+2H+→Zn2++H2O
In base: ZnO+H2O+2OH−→[Zn(OH)4]2−
Aluminium oxide
with acid:Al2O3+3H2O+6H3O+(aq)→2[Al(H2O)6]3+(aq)
with base: Al2O3+3H2O+2OH−(aq)→2[Al(OH)4]−(aq)
61. An alloy that made up of copper and tin is
A. brass B. solder metal C. bronze D. stainless steel
Ans: C. bronze
Solution:
Bronze is an alloy composed of copper and tin.
Brass is an alloy of copper and zinc
Solder is a metal alloy usually made of tin and lead
stainless steel is made primarily from iron and carbon
62. When a carbon dioxide reacts with calcium hydroxide salts and water are produced. Then the nature of carbon dioxide is
A. acidic C. both acidic and basic
B. metallic D. basic
Ans: A. acidic
Solution:
It is an example of a neutralization
reaction in which an acid (carbon dioxide) reacts with base (calcium hydroxide)
to form salt and water.
63. “The three elements were written in the order of increasing atomic mass the atomic mass of middle element was roughly the average of the atomic masses of other two elements.” This law was stated by
A. Dobereiner C. Henry Moseley B. Mendeleev D. Newlands
Ans: A. Dobereiner
Solution:
Dobereiner's law of triads: When elements are arranged in order of increasing atomic masses,groups of three elements(triads), having similar chemical properties are obtained.
Moseley gave the Modern Periodic Law which states that: Physical and chemical properties of the elements are the periodic function of their atomic numbers.
Mendeleev's Periodic Law: It states that “the properties of elements are the periodic functions of their atomic masses.”
Newlands: The law of octaves states that “Every eight element has similar properties when the eighth element, when the elements are arranged in the increasing order of their atomic masses.
64. Carbon has the ability to form bonds with other atoms of carbon giving rise to large molecules. This unique property of carbon is
A. saponification B. catenation C. hydrogenation D. esterification
Ans: B. catenation
65. The group of compounds which are in homologous series
A. CH4 , C2 H6 , C3 H8 B. CH4 , C2 H4 , C2 H2
C. CH4 , CH3 -OH, H-CHO D. C2 H2 , C3 H6 , C4 H10
Ans: A. CH4 , C2 H6 , C3 H8
Solution:
A homologous series in organic chemistry is a group of organic compounds (compounds that contain C atoms) that differ from each other by one methylene (CH2 ) group. For example, methane, ethane, and propane are part of a homologous series.
66. The number of periods and groups in the modern periodic table respectively are
A. 7 and 18 B. 7 and 9 C. 18 and 7 D. 9 and 7
Ans: A. 7 and 18
Solution:
There are a total of 18 groups and 7 periods in the modern periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down)
67. The main function of abscisic acid (hormone) in plants is to
A. increase the length of cells B. inhibits the growth of plants
C. promote cell division D. promote the growth of stem
Ans: B. inhibits the growth of plants
Solution:
Increase the length of cells - Auxin
Inhibits the growth of plants - Abscisic acid
Promote cell division - Cytokinins
Promote the growth of stem - Auxin
68. A common part among the following that is found in reproductive system of both in flowering plants and humans is
A. Vas deferens B. Anther C. Ovary D. Style
Ans: C. Ovary
Solution:
Ovary is a female reproductive organ in which ova or eggs are produced in humans.
In the flowering plants, an ovary is a part of the female reproductive organ
69. Which of the following is an inherited trait?
A. Reduction in the weight of an organism due to starvation
B. Removal of tail in mice by surgery
C. Development of muscles in athletes
D. Type of earlobe
Ans: D. Type of earlobe
Solution:
- In humans- eye color, hair color, skin color, freckles, dimples, etc. are all examples of inherited traits.
An acquired trait is the character developed in an individual as a result of environmental influence. These traits are not coded by the DNA of a living organism and therefore cannot be passed on to future generations.
Ex.
- Reduction in the weight of an organism due to starvation
- Removal of tail in mice by surgery
- Development of muscles in athletes
Ans: C. Veins
Solution:
The blood vessels that carry blood from all parts of the human body to the heart are Veins
The blood vessels that carry blood from heart to all parts of the human body are Arteries
Capillaries help to connect your arteries and veins in addition to facilitating the exchange of certain elements between your blood and tissues.
The pulmonary arteries carry blood from the right side of the heart to the lungs.
71. The plants can get rid of excess of water by this process
A. Photosynthesis B. Transpiration C. Respiration D. Translocation
Ans: B. Transpiration
Solution:
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
The plants can get rid of excess of water by the process of Transpiration
The process of respiration in plants involves using the sugars produced during photosynthesis plus oxygen to produce energy for plant growth.
Translocation is a biological mechanism involving the transfer of water and other soluble nutrients from one part of the plant to another through the xylem and phloem, which occurs in all plants.
72. The correct path of urine flow in the human excretory system
A. kidney > ureter > urethra > urinary bladder
B. kidney > urinary bladder > urethra > ureter
C. kidney > ureter > urinary bladder > urethra
D. urinary bladder > kidney > ureter > urethra
Ans: C. kidney > ureter > urinary bladder > urethra
73. Which of the following is the bio-diversity hot spots ?
A. Deserts B. Rivers C. Oceans D. Forests
Ans: D. Forests
Solution:
Forests are considered 'biodiversity hot spots' because large number of life forms (such as bacteria, fungi, fern, nematodes, insects, birds, reptiles, mammals, gymnosperms and angiosperms) are found there. These are the regions with large biodiversity of endangered species, many of them being highly endemic.
74. The growth of pollen tubes towards ovules in the flower of plants
A. Chemotropism B. Phototropism
C. Geotropism D. Hydrotropism
Ans: A. Chemotropism
Solution:
The growth of a pollen tube towards ovule is induced by a chemical (sugar) substance secreted by the ripened stigma of flower into the style towards ovary. It is an example of chemotropism, pollen grain responds to stimulus by growing a polen tube in downward direction, towards ovule for fertilisation.
75. A group that contains only bio-degradable substances among the following is
A. polythene, wood, leather B. leather, detergent, plastic
C. wood, grass, leather D. paper, bakelite, grass
Ans: C. wood, grass, leather
Solution:
Ans: B. medulla
77. Which of the following is not a part of human female reproductive system?
A. Ovary B. Uterus C. Vas deferens D. Fallopian tube
Ans: C. Vas deferens
78. The main purpose of constructing water harvesting structures is to
A. hold rainwater on the surface of the earth
B. use water for irrigation
C. use water for fish farming
D. recharge the ground water
Ans: B. use water for irrigation
79. A pure tall pea plant (TT) is crossed with a short pea plant (tt). The ratio of pure tall pea plant to the short pea plants produced in F2 generation is:
A. 3 : 1 B. 1 : 3 C. 1 : 1 D. 2 : 1
Ans: A. 1 : 1
80. The wings of bat and pigeon are the examples of
A. Analogous organs B. Vestigial organs
C. Homologous organs D. Adaptive organs
Ans: A. Analogous organs
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