InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Liquids have definite ____ but no definite ________. |
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| 52. |
5 pa os pressure is required to be exerted on an are of250 m^2 .A box is placedon that area and the surface of cantact is exactly 250 m^2 .What should be the mass of the box so that exactly 5 pa of pressure can be exerted ? |
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Answer» Solution :`Pressure ="Force"/"AREA" ` `5 = "Force "/250 (1 "PA" = 1 N//m ^2)` `therefore` R reqired force= 1250 N LET m be the mass of the OBJECT `therefore m xx g = 1250` `therefore m xx 10=1250` `therefore m= 1250/10 kg = 125 kg""(because g ~~ 10 m s^(-2))` |
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| 53. |
Why are industrial areas prone to acid rain? |
| Answer» Solution :MANY industriesrelease oxides of nitrogen and sulphur in to ATMOSPHERE . These oxides dissolve in rain water which LEADS to acid rain . HENCE , industrial areas are prone to acid rain. | |
| 54. |
Define multiple units. |
| Answer» Solution :PREFIXES or UNITS used to represent very HIGHER values of PHYSICAL quantities are CALLED multiples. | |
| 55. |
Answer the question given below on the basis of the figure given. (i) Identify the above figure and label the parts A and B. (ii) How many small bones are present in this part ? (iii) Identify the organ which passes through the hollow tube. |
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Answer» Solution :(i) The above FIGURE is identified as vertabral column. (A) Vartebrae (B) Spine (II) There are 33 small bones present in the vertebral column. (iii) The organ that PASSES through the bollow tube is spinal cord. |
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| 56. |
The effective length of the first magnet is two times that of the second magnet. The effective length of the third magnet is one-third of the first magnet. If the effectiv lengthof the second magnet is 7.5 cm, the effective length of the third magnet is ______ |
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Answer» 5 cm Therefore, effective length of the first magnet =`2xx7.5` `=15 cm ` Therefore, effective length of the THIRD magnet `=1//3xx15 cm` `= cm. ` Hence , the CORRECT option is (a). |
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| 57. |
A farmer was cutting mangoes from a tree with a long stick of length 2 m. He cut almost all mangoes at the lower branches of tree and wanted to cut the mangoes at higher branches of it. To do this he attached another stick to the top of the first stick so that the overall length increases by 1 m. If the distance between his hands position is the same as before at 40 cm and weight of each mango is 5 N, then calculate the change in mechanical advantage of stick to do this, for the same effort of 20 N. |
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Answer» MECHANICAL advantage INCREASES by 0.26 `=(40)/(200)-(40)/(300)=0.0066` Hence, the correct option is (b). |
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| 58. |
What is Umbra ? |
| Answer» Solution :Umbra is the DARK region behind object FACING LIGTH which does not RECEIVE light at all. | |
| 59. |
Assertion (A): m^(2) is a derived unit. Reason (R ): Area is a derived quantity. |
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Answer» A and R is CORRECT and R is the correct EXPLANATION of A. |
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| 60. |
Dry cell converts _________. |
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Answer» MECHANICAL ENERGY, ELECTRICAL energy |
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| 61. |
Explain the principle invovled in the making of coffee decoction. |
| Answer» SOLUTION :COFFEE POWDER contains some soluble components and some insoluble component. When HOT WATER is added, the soluble components go into water giving decoction. The insoluble components are filtered off. | |
| 62. |
{:("An example for metalloid","Groundnut oil and acohol"),("Heaviest element","Conversion of solid to liquid"),("Elements in definite proportion","Rotation of mixture at high speed"),("An example for solid non-metal","Property of gases"),("Molecule made up of similar atoms","Separation of coloured pigments"),("Kerosense and petrol","An example for inert gas"),("Sublimable substance","Properities of metals and non-metals"),("Property of a material to be drawn into thin wives","conversion of gas into liquid"),("Conversion of liquid to solid","Difference in boiling points of liquids"),("Material used for filtration","Nature of gas in liquid mixtures"):} |
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| 63. |
1 foot candle =_____ Lux. |
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| 64. |
______ effect of electric current is used in rice cooker. |
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Answer» Sound |
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| 65. |
Calculate thevolume of oxygen and nitrogen present 250 l of air. |
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Answer» 250 l of air contains`(78xx250)/(100)=195`l of nitrogen Volume percentage of OXYGEN in AIRIS`21%` `RARR 100` l of air contains 21 l of oxygen 250 lof air contains`(250xx21)/(100)=52.5`lof oxygen. |
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| 67. |
A nut is placed in a nut cracker at 5 cm from the fixed end. If the force experienced by the nut is 100 N when a force of 20 N is applied at the free end of the nut cracker, find the length of the nut cracker. |
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Answer» 5 Therefore, `(100)/(20)=("Effort arm")/(5)` `implies` Effort arm =25 cm HENCE, the correct OPTIONS is (b). |
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| 68. |
Four spheres made of different materials but having the same mass, have a radii of 100 mm, 2xx10^(-2)m, 30 cm and 10^(-5)km then arrange them in ascending order of their volumes. |
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Answer» `V prop R^(3)` `r_(1) = 10^(2)` mm = `10^(-1)`m `r_(2) = 2xx10^(-2) = 2xx10^(-2) m` `r_(3)=30xx10^(-2)m=3xx10^(-1)m` `r_(4) = 10^(-5) xx 10^(3) m = 10^(-2)m` `V_(4) lt V_(2) lt V_(1) lt V_(3)` |
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| 69. |
Classify the following substances into element, compound and mixture. (i) Brass (ii) Distilled water |
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Answer» SOLUTION :Elements-Nitorgen, mercury, argon,bromine COMPOUNDS -Carbon dioxide, washing SODA, sugar. Mixtures-Fuit juice, soda water, CONCRETE, saling water, SAND. |
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| 70. |
Explain the role of catalytic converters in automo - bile engines. |
| Answer» SOLUTION :Catalytic converters help in the CONVERSION of more harmful carbon monoxide into less harmful carbon DIOXIDE and oxide of NITROGEN that CAUSES acid rain into `N_(2)` which is inert in nature. | |
| 71. |
Can an empty bottle be filled with water , when it is inverted into a basin of water vertically ?Ifnot , what is the correct way of filling the bottle with water ? Justifyyour answer. |
| Answer» Solution :SINCE the bottle is filled with air , WATER cannot occupy this SPACE UNLESS a PASSAGE is provided for the expansion of air . Hence , the bottle should be inverted obliquenly. | |
| 72. |
If angle fo incidence of a light ray ona plane mirror is 30^(@) , then |
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Answer» The angle of reflection is `30^(@)` |
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| 73. |
Complete the following sequence of circuit positive teminal of Cell to Wire to Switch tobulb to_____ to_____. |
| Answer» SOLUTION :WIRE , NEGATIVE TERMINAL of CELL. | |
| 74. |
{:("Across","Down"),("1. Prefix used instead of a 10 power positive number.","2. Only these quantities can be measured."),("6. A body does not change its position.","3. Standard reference of a physical quantity."),("8. The quantity that depends on other quantities.","4. Kelvin is the unit of"),("9. Unit of electric current","5. Prefix used to represent "10^(-2) " is"),("10. Paper used to measure the area of irregular lamina.","7. Distance covered by the body in unit time."):} |
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| 75. |
Mention the inter-conversions associated with the following phenomena. (a) Wet clothes are hanged on a string. (b) Appearance of dew drops on the leaves on winter morning. (c) Foggy appearance on a mirror when exhaled air is blown over it. (d) Occurrence of snow fall. (e) Reduction in size of naphthalene balls when placed in a cupboard. |
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Answer» Solution :(a) EVAPORATION (B) Condensation (c) Condensation (d) Direct CONVERSION of water VAPOUR into ice crystals as very low temperatures (e) Sublimation. |
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| 78. |
In which of the following is an electromagnet used |
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Answer» Compass |
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| 80. |
X, Y and Z are three substance, On passage of electricity through X, two substances A and B are formed, Y is a liquid which on evaporation generates C as a residue and D was vaporized. Z could not be split up into any simpler substances further. A is found to be a good conductor of heat and electricity while B was found to be a gas. it is possible to split C and D into simpler substances chemically. what do you infer regarding the nature of these substances with respect to composition? |
| Answer» Solution :X is a compound A and B as X could be split up into A and B by the passage of ELECTRICITY Y should be a mixture of C and D as they could be obtained by physcial method like evaporation. A should be a METAL and B should be a non-metal. C and D are compounds as they cold be split up into simpler SUBSTANCES by HEATING Z is an element as it could not be split up into simpler substances. | |
| 81. |
Minnimum 1 kpa pressure is required to carry out an activity .A machine which can apply 10^5 N force is use for this purpose .What should be the maxium area on which this force is required to be applied so that the activity can be carried out ? |
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Answer» SOLUTION :1 kpa = 1000 pa =`1000 N//m^2` Hence , aminimum of 1000 N force is required Pressure `="Force"/"Area" rArr 1000 = 10^5/"Area"` `therefore " Area"= 10^2=100 m^2` The maximum area on which the force is required to be appied is `100 m^2` Hence ,Pressure is inversely PROPORTIONAL to area when the force is kept CONSTANT . |
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| 83. |
What the the properties of a bar magnet ? |
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Answer» Solution :Properties of a bar magnet : A magnet attracts small pieces of the iron and this PROPERTY is called attractive property. A freely-suspendedbar magnet aligns itself in north-south direction of the earth and this is known as geographic directive property. LIKES pole of a magnet REPEL and the unlike poles ATTRACT each other. Magnetic poles always exist in PAIRS. |
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| 84. |
Is is necessary to save electricity? If so, suggest a few ways to save electricity. |
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Answer» Solution :Yes, it is NECESSARY to save electricity since a lot of investment is involved in generating it . `*` Avoid using tube lights and filament BULBS by REPLACING them with CFL bulbs or LED lights. `*` Switch off the lights and fans when not in use. `*` Use solar energy as per the REQUIREMENT . |
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| 85. |
The process of pouring out the clear water after setting down of the mud particles is called |
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Answer» Sedimentation HENCE, the correct option is(B). |
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| 86. |
Endoskeleton is seen in earthworm. |
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| 87. |
{:("Across") , (3. "It is a non-conventional source of energy (Two words)") , (4."The SI unit of work is") , (6. "It is a form of chemical energy"), (7."Work done on the body if the displacement of the body is in the direction of force applied on it") , (8."Electricity produced from the stored water in a dam is called (Two words)"), (10 . "This converts light energy into bio-chemical energy"):}:|{:("Down") , (1. "It is a domestic source of energy (Three words)"), (2. "Energy stored in a compressed string (Two words)") , (5 . "Heat energy is measured in________"), (8."Gravitational potential energy of the body depends on mass and ______") , (9"It is a conventional source of energy"):} |
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| 88. |
The ratio of oxygen and nitrogen in air is about _____________ by volume. |
| Answer» Solution :The RATIO of OXYGEN to nitrogen in air`UNDERLINE(7:26)` by volume. | |
| 89. |
If speed is the ratio of distance to time, then write its CGS unit. |
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| 90. |
The formula for angle of deviation, d=_____ . |
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| 91. |
The percentage of water vapour in air depends on place and season ' , Comment on the statement. |
| Answer» Solution :In places which are close to the coast , the proportion of WATER VAPOUR in the atmospheric air is GREATER than the places which are far from the sea . In summer, the amount of water vapour in the atmospheric air is more due to high rate of evaporation , and hence , HUMIDITY is more. In winter , the temperature is low and rate of evaporation and HENCEIS less. Therefore , the proportion of water vapour in the atmospheric air is variable and depends on place and season. | |
| 92. |
Name the products formed in the following.(a) Carbon + Oxygen to(b)Glucose+ Oxygen to(c )Phosphorus pentoxide +Waterto |
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Answer» Solution :(a) Carbon dioxide (B)Carbon dioxide and water vapour ( c)PHOSPHORIC ACID |
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| 93. |
The volume of a single liquid drop can be measured using a_____. (a) Measuring jar (b) Measuring flask(c ) Pipette(d) Burette |
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Answer» Solution :The volume of a SINGLE LIQUID drop can be MEASURED using a burette. HENCE, the CORRECTION option is (d). |
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| 95. |
Choose the correct one from the following. |
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Answer» Lunar eclipse occurs on full moon day. |
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| 96. |
Whichof thefollowingjoints allowmovement in manydirections ? |
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Answer» Pivot joint HENCE, the CORRECT OPTION is ( c). |
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| 97. |
Explain the working of hurricane lamp ? |
Answer» Solution :Hurricane lamp  This consists of a SMALL kerosene tank at the bottom to which a burner is fixed. At one end of a wick, the burner is put inside the kerosone in the tank. A glass CHIMNEY is provided to prevent wind from putting off the flame and also to distribute the light evenly in all directions. When the wick is lit, kerosene flows up through the fine hole in the wick due to CAPILLARY action. The HOLES provided to the burner help cool air to come in ad the holes provided at the top help hot air to LEAVE the lamp. |
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| 98. |
Force of friction cannot be reduced by |
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Answer» Ball bearings |
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| 99. |
A see-saw of length 2 m is pivoted at 50 cm form one end in a public park. What is the effort applied at the near end to the fulcrum to lift a load of 150 N at the far end to fulcrum? |
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Answer» `=(50)/(150)=(1)/(3)` `MA=(L)/(E)` `E=(L)/(MA)=150xx(3)/(1)` `:.` Effort =450 N |
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| 100. |
Which of the following planes cannot be used to push load to a certain height? |
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Answer» A PLANE of slope 2 |
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