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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.
| 101. |
Which one of the following is not a unit of energy?A. CalorieB. Electron voltC. MegawattD. Watt hour |
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Answer» Correct Answer - c Megawatt is a unit of power. |
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| 102. |
The distance travelled by a body moving along a straight line with uniform acceleration (a) in the nth second of its motion is given by `S_(n)=u+(a)/(2)(2n-1)`. This equation isA. only numerically correct onlyB. only dimensionally correct onlyC. correct both dimensionally and numericallyD. neither numerically nor dimensionally correct |
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Answer» Correct Answer - c This equation is correct both dimensionally and numerically. However if the equation is `S_(n)=u+(a)/(3)(2n-1)` then it is dimensionally correct but numerically wrong. |
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| 103. |
If `x=at+bt^(2)`, where `x` is the distance travelled by the body in kilometres while `t` is the time in seconds, then the units of `b` areA. `kms^(2)`B. `kms`C. `km//s^(2)`D. `km//s` |
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Answer» Correct Answer - c `x=at+bt^(2)` All terms must have the same dimensions. `therefore |x|=|bt^(2)|` `therefore b=(x)/(t^(2))` `therefore` The unit of b is `km//s^(2)` or `kms^(-2)`. x = at + bt² [x]=[bt²] [x/t²] = [b] [km/s²] = [b] Answer: C. km/s²
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| 104. |
The weight of the givensolid cylinder rodis 2512 N. The density of the body is `"________"` Kg `m_(-3)`.`(take g =10 m s_(-2))` A. 2512B. `25xx12`C. `10^(3)`D. `10^(6)` |
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Answer» Correct Answer - D Volume = pi xx (radius)^(2)xxheight = `pi xx (0.02)^(2)xx 0.2` = `25.12xx 10^(-5)` " "`m^(3)` weight = `mxxg` density = `"mass"/"volume"` = `251.2/(25.12xx10^(-5))` `(25.12xx10^(1))/(25.12xx10^(-5))` = 106 " kg " `m^(-3)` |
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| 105. |
The weight of the givensolid cylinder rodis 2512 N. The density of the body is `"________"` Kg `m_(-3)`.`(take g =10 m s_(-2))` A. (a) 2512B. (b) 25xx 12C. (d) `10^(3)`SD. (d)10^(6)S |
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Answer» Correct Answer - D Volume = `pixx(radius)^(2)xxheight` =`pixx(0.02)^(2)xx0.2 = 25.12 xx 10^(-5) m^(3)` Weight = mxxg Mass = `weight/2 =2512/12 =251.2 `kg `"Density" =("mass")/("volume") = 251/(25.12xx10^(-5)) = (25.12xx10^(1))/(25.12xx10^(-5)` =`10^(6) kg m_(-3)` |
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| 106. |
1 g `m_(-3) = ` __________` kg `cm^(-3)`A. (a)` 10^(9)`B. (b) `10^(6)`C. (b) `10^(-6)`D. (d) `10(-9)` |
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Answer» Correct Answer - D `1 " g" " " m^(-3)= (1 g)/m^(3)= 10^(-3)/((10^(2))^(3) cm^(3)) =10^(-3)xx10^-6xx=10^(-9)kg` |
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| 107. |
The dimensions of surface tension areA. `[M^(2)L^(2)T^(-2)]`B. `[M^(2)LT^(-2)]`C. `[MT^(-2)]`D. `[MLT^(-2)]` |
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Answer» Correct Answer - C Surface tention `=("Force")/("Length")=(MLT^(-2))/(L)=[MT^(-2)]` |
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| 108. |
The unit of force in SI system is newton and it is given as 1 newton= 1 kg m `s^(-2)`. In CGS system its unit is dyne and it is given as 1 dyne = ` g cm `s^(-2)`. Arrange the following steps in a sequential order to relate the SI unit ans CGS unit of force. (a) Write the conversions of kg and m, into g and cm, respectively. (b) Substitute the conversion in 1 newton = 1kg m `s^(-2)`. (c ) Write the relation between 1 newton and 1 dyne. (d) Write in place of 1g cm `s^(-2)` as 1 dyne.A. a c b dB. a b d cC. b d a cD. c d a b |
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Answer» Correct Answer - B The SI unit of force is newton, 1 newton = 1 kg m `s^(2)` . First convert kg and m into g and cm. Substitute these conversations in 1 newton = 1 kg m ` s^(-2)` . Now in the place of 1 g cm ` `s^(-2)`, write 1 dyne as 1 newton = `10 ^(5)` dyne. |
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| 109. |
Which of the following statement is wrong?A. The mass of a body can be measured by using a beam balance.B. The weight of a body can be measured by using a pring balance.C. The mass of a body can be measured by using a spring balance.D. The weight of a body cannot be measured by using a beam balance. |
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Answer» Correct Answer - C The density of a body cannot be measured by using a spring balance. |
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| 110. |
The wrong unit conversation among the following isA. 1 angstrom`=10^-(10)m`B. 1 fermi`=10^(-15)`C. 1 light year`=9.46xx10^(15)`D. 1 astronomical unit `=1.496xx10^(-11)` |
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Answer» Correct Answer - D I astronomical unit `=1.496xx10^(11)` |
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| 111. |
Which of the following statement is wrong?A. The mass of a body can be measured by using a beam balance.B. The weight of a body can be measured by using a spring balance.C. The density of a body can be measured by using a spring balance.D. The weight of a body cannot be measured by using a beam balance. |
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Answer» Correct Answer - C The density of a body cannot be measured by using a spring balance. |
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| 112. |
The density of the solid cylindrical bar shown in the figure is` 5xx 10^(3)` kg `m^(-3)` . The weight of the bar is `"_________"` N. (take g=10 m `s^(2)`A. (a) 157B. (b) 1570C. (c ) 320D. (d) 3.2 |
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Answer» Correct Answer - A Density = `5xx10^(3)` kg `m^(-3)` Volume =`pi xx (radius)^(2) xx height` = `3.14 xx (0.1^(2))xx0.1` = 0.00314 "" `m^(3)` Density =`"mass"/"volume"` Mass = `density xx volume` = `5 xx 10^(3) xx 0.00314` = 15.7 " kg " Weight = `mxx g =15.7 xx 10` = 157 " N " |
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| 113. |
Which among the followig is the unit of heat?A. CalorieB. KelvinC. Degree centrigradeD. All the above |
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Answer» Correct Answer - A Calorie is a unit of heat. |
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| 114. |
1 kg `m^(-3)`=_____.A. 100B. 1/100C. 1000D. 1/1000 |
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Answer» Correct Answer - D 1 kg `m^(-3)=(1)/(1000)g" "cm^(-3)` |
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| 115. |
which of the following measurements is most precise ?A. 5 cmB. 5.00 cmC. 5.000 cmD. 5.00000 cm |
| Answer» Correct Answer - D | |
| 116. |
What is the full form of SI system? |
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Answer» An international system of unit |
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| 117. |
Which of the following scale gives more accurate reading?A. One metre inn a scale is divided into 1000 equal parts.B. One cm in a scale is divided into 100 equal parts.C. One mm in a scale is divided into 2 equal parts.D. One mm in a scale is divided into 5 equal parts. |
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Answer» Correct Answer - B The scale which is having the smallest least count is more accurate. In the second scale, 1 cm is divided into 100 parts. `thereforeL.C.=(10mm)/(100)=0.1mm` |
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| 118. |
Which of the following measurement is most precise?A. 5.00 mmB. 5.00cmC. 5.00mD. 5.00km |
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Answer» Correct Answer - A All given measurements are correct upto two decimal places. As here 5.00mm has the smallest unit and the error in 5.00mm is least (commonly taken as 0.01 mm if not specified) hence, 5.00mm is most precise. |
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| 119. |
What is the SI Unit of mass? |
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Answer» SI unit is Kilogram. |
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| 120. |
Find the answer for the following questions within the grid.1. 10-3 is one _____ 2. SI Unit of time _____ 3. Cross view of reading for a measurement leads to _____ 4. _____ is the one what a clock reads. 5. _____ is the amount of substance present in an object 6. _____ can be taken to get the final reading of the recordings of different of students for a single measurement. 7. _____ is a fundamental quantity.8. _____ shows the distance covered by an automobile. 9. A tailor use _____ to take measurements to stitch a cloth. 10. Liquids are measured with this physical quantity. |
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Answer» 1. Millimetre 2. second 3. error 4. Time 5. Mass 6. Average 7. Length 8. Odometer 9. Tape 10. Litre |
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| 121. |
What are the two parts present in a measurement? |
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Answer» 1. multiple 2. sub |
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| 122. |
Complete the given tableVolume .............kg ............Length of your little finger ............km ........... |
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Answer»
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| 123. |
Define mass? |
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Answer» Mass is the measure of the amount of matter in an object. |
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| 124. |
The conversion of 7 m into cm gives (a) 70 cm (b) 7 cm (c) 700 cm (d) 7000 cm |
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Answer» Correct answer is (c) 700 cm |
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| 125. |
Choose the correct one (a) km > mm > cm > m (b) km > mm > m > cm (c) km > m > cm > mm (d) km > cm > m > mm |
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Answer» (c) km > m > cm > mm |
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| 126. |
Quantity that can be measured Is called (a) Physical quantity (b) Measurement (c) unit (d) motion |
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Answer» (a) Physical quantity |
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| 127. |
Mass of 1 ml water is_____g. |
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Answer» Correct Answer - 1 Density of water is 1 g `ml^(-1)`. Thus, the mass of 1 ml water is 1 g. |
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| 128. |
The SI unit of density is: |
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Answer» Correct Answer - kg `m^(-3)` SI unit of density is kg `m^(-3)` |
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| 129. |
If the unit of force is 1 kN, unit of length 1 km and unit of time is 100s, what will be the unit of mass?A. 1000kgB. 1kgC. 10000kgD. 100kg |
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Answer» Correct Answer - C Let x kg be unit of mass, then `=f=(xkg)(1000m)(100s)^(-2)` `implies 1000=x xx1000xx(1)/(10000)` `:. X=10000kg=10^(4)kg` |
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| 130. |
A thin wire has length of 21.7 cm and radius 0.46 mm. Calculate the volume of the wire to correct significant figures?A. `4cm^(3)`B. `0.14 cm^(3)`C. `0.14 cm^(3)`D. `0.001 cm^(3)` |
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Answer» Correct Answer - B Given,` "l"=21.7cm, r=0.46mm=0.0046cm` Volume of wire, `V=pir^(2)l=(22)/(7)(0.046)^(2)(21.7)` ` =0.1443cm^(3)=0.14cm^(3)` |
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| 131. |
How many significiant figures are there in the measured values. (i) `227.2g`, (ii)` 3600g` (iii)` 0.00602g` (iv)` 250xx10^(10)g`A. `4,2,3,3`B. `3,4,3,2`C. `4,2,5,2`D. `3,2,2,1` |
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Answer» Correct Answer - A (i)227.2 g has all the non -zero digis. Hence, it has four significant figures. (ii) According to the rule number 4, trailing zeroes are not significant. Hence, 3600 g has 2 significant figures. (iii) According to the rule number 3, the zeroes at the begninning are not significant, Hence,0.00602 g has 3 significant figures. (iv) Accouding to the rule number 6,it has 3 significant figures. |
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| 132. |
The expression `[M^(1)L^(2)T^(-2)]` representsA. PowerB. MomentumC. PressureD. Kinetic Energy |
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Answer» Correct Answer - d The expression `[M^(1)L^(2)T^(-2)]` represents K.E. `because K.E.=(1)/(2)mv^(2) therefore [(1)/(2)mv^(2)]=[M^(1)L^(2)T^(-2)]` The quantities in (a), (b) and (c ) have different dimensions. |
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| 133. |
Curie is a unit of (A) energy of γ-rays (B) half life (C) radioactivity (D) intensity of γ-rays |
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Answer» Answer is (C) radioactivity Curie = disintegration/second |
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| 134. |
The answer of (9.15 + 3.8) with due regards to significant figure is (A) 13.000 (B) 13.00 (C) 13.0 (D) 13 |
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Answer» Answer is (C) 13.0 |
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| 135. |
S = A(1 - e-Bxt), where S is speed and x is displacement. The unit of B is (A) m-1 s-1 (B) m-2 s (C) s-2 (D) s-1 |
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Answer» Answer is (A) m-1 s-1 Bxt is unitless. ∴ Unit of B is m-1 s -1 |
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| 136. |
Three cylindrical flasks A, B and C of diameter 50 mm, 75 mm and 100 mm, respectively have graduation marked in mm and are used for measurement of volume of liquid. Which of the following statement is correct?A. A is more accurate than B and CB. C has better least count than BC. The least count of all three are the same.D. B has better least count than A. |
| Answer» Correct Answer - A | |
| 137. |
A wire is wound over a pencil and placed over a scale as shown in the figure. The diameter of the given wire is `"________"`. A. (a) 1.45 cmB. (b) 2.9 mmC. (c ) 2.9 mD. (d ) 1.45 mm |
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Answer» Correct Answer - D Number of turns=20 Distance =`(4.1 - 1.2)` = 2.9 cm So, the diameter of he wire = `("2.9 cm")/20 = 0.145` = 1.45 mm |
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| 138. |
Assertion (A): The liquid displaced by a solid cube of a side 3 cm when completely immersed in the liquid is more than displaced by a solid cube of side 2 cm. Reason (R ) : The liquid displaced by a solid increases with increase in the volume of the solid.A. (a) Both A and R are true and R is the correct explanation of A.B. (b) Both A and are true, but R is not the correct explanation of A.C. (c ) A is true but R is false.D. (d) Both A and R are false. |
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Answer» Correct Answer - A The volume of liquid displaced by a solid cube of side 3 cm is 27 `cm^(3)` and the volume of liquid displaced by a solid cube of side 2 cm is 8 `cm^(3)`. So, the solid cube with side 3 cm can displace more liquid than the cube with side 2 cm. The volume of he liquid displaced increases with increase in he volume of the solid. So, both A and R are correct and R is the correct explanation of A. |
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| 139. |
In a particular scale A, one metreis divided into 500equal parts and in scale B one cm is divided into 5 equal parts and in scale C one mm is divided into 2 equal parts, then the accuracy of ` "________"`.A. (a)` AgtBgtC`B. (b) `A=BltC`C. (c ) A=BgtCsD. (d) A=B=C |
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Answer» Correct Answer - b Least count of A=`1/500=0.002 ` m L.C of `(1 cm)/5=(1xx10^(_2)m)/5=0.002`m L.C of C =`(1mm)/2=(1xx10^(-3))/2=0.0005` So, L.C of `A= B gt C` or occurancy of` A= B gt C` |
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| 140. |
Joule-second is the unit ofA. energyB. momentunC. angular mometumD. power |
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Answer» Correct Answer - C Since` (mvr)=n.(h)/(2pi)` and `E=hv implies h=(E)/(v)=("joule")/(s^(-1)` So, unit of h=joule second =angular momentum |
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| 141. |
If the radius of a sphere is doubled, then the density of the sphere is `"________"` times its original value.A. (a) `1//2`B. (b) 2C. (c ) 4D. (d) `1//8` |
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Answer» Correct Answer - D When the radius is doubled, then the volume will becomes 8 times the orginal. But density = "mass"/"volume"=m/V d=`m/(8V)=1/8(d)` |
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| 142. |
In the SI system, unit of temperature isA. degree centigradeB. KelvinC. degree celsiusD. degree Fahrenheit |
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Answer» Correct Answer - B Kevlin is the unit of temperature in SI system. |
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| 143. |
In a particular scale A, one metreis divided into 500equal parts and in scale B one cm is divided into 5 equal parts and in scale C one mm is divided into 2 equal parts, then the accuracy of ` "________"`.A. (a)` A gt B gt C`B. (b) `A = B gt C`C. (c ) A = B gt C`D. (d)` A = B gt C` |
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Answer» Correct Answer - B Last count of A= `1/500` = 0.002 " m ". L.C of B = `(1cm)/5=(1xx10^(-2))/5=0.002 " m "`. L.C of C= `(1 mm)/2=(1xx10^(_3))/2=0.0005 " g "m`. So, " "L.C of A=B lt C. Then the accuracy of A=B lt C. |
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| 144. |
An atlas of a country is shown in the figure, the distance between cities A and B is______ A. 35 kmB. 3500 kmC. 350 kmD. both a and b |
| Answer» Correct Answer - C | |
| 145. |
The number of significant figures in 3257000 isA. 7B. 6C. 5D. 4 |
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Answer» Correct Answer - d As all zeros on the right of the last non zero digit are not significant, the number of significant figures is 4. |
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| 146. |
Volume of an irregular shaped solid can be measured by using a____A. density bottleB. spring balanceC. measuring cylinderD. physical balance |
| Answer» Correct Answer - C | |
| 147. |
Arrange the following steps in a sequence of find the vlume oof an irregular shaped solid body. (A). The irregular shaped solid is tied with the thread and is lowered into the measuring cylinder. (B). A measuring cylinder with graduations in millilitre or cubic centimetrer is taken. (C). The level of water in the measuring cylinder rises after immersion of the solid. (say `V_(2)`) (D) First, it is filled with water to a certain level or volume. (say `V_(1)`) (E). The volume of the stone is equal to the difference between the volume of the water before and after the immersion of the stone. `(V_(2)-V_(1))`.A. ABCDEB. BCADEC. BDACED. EDACB |
| Answer» Correct Answer - C | |
| 148. |
The smallest measurement that can be measure by using a wall clock is _____.A. 1 secondB. 1 minuteC. 1 hourD. 2 second |
| Answer» Correct Answer - A | |
| 149. |
Assertion (A) : The magnitude of volume of any liquid is equal to the magnitude of its mass what measured in CGS system. Reason (R ) : Density of the liquid = mass of the liquid `xx` volume of the liquid.A. (a) Both A and R are true and R is the correct explaanation of A.B. (b) Both A and R are true, but R is not the correct explanation of A.C. (c ) A is true but R is false.D. (d) Both A and R are false. |
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Answer» Correct Answer - D The magnitude of volume of any liquid is not equal to the magnitude of its mass when measured in CGS system. Only in case of water the magnitude of volume and mass are equal. So, A is incorrect. Density of substance= `"mass of the substance"/"`volume of the substance" So, R is also wrong. Both A and R are incorrect. |
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| 150. |
Different units of density are " kg " `m^(-3)`. Arrange the following steps in a sequential order to write the ascending order of these units.A. (a) a d c bB. (b) c b d aC. (c ) a b d cD. (d) a d b c |
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Answer» Correct Answer - D Different units of density are given as kg `m^(-3)`, " g " `cm^(-3)`, " kg " `cm^(-3)` and " g " `m^(-3)`. First convert all the remaining units into any one of the systems, (a,d, b) and then compare the numerical values after the conversion and arrange them in the ascending order (c ). |
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