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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.
| 151. |
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^9-3)` volume= `pixx(radius)^(2)xxheight` =` 3.14xx(0.1^(2))xx 0.1` = 0.00314 `m^(3)` Density =`mass/volume Mass = density xx volume = `5xx10^(3)xx 0.0314`=15.7 kg Weight =` mxxg= 15.7xx 10= 157 N` |
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| 152. |
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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| 153. |
Which of the following statements is incorrect?A. As the temperature of gas increases, its volume increases.B. As the temperature of a gas increases, its density decreases.C. As the temperatrue of a gas increases, its density increases.D. both a and b |
| Answer» Correct Answer - B | |
| 154. |
Which of the following statements is//are incorrect?A. (a) The weight os a body can be zero.B. (b) The weight of a body can be greater than zero.C. (c ) The mass of a body can be zero.D. (d) Both (a) and (c ). |
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Answer» Correct Answer - C Mass of a body can never be zero and the weight can be zero if th acceleration due to gravity is zero. |
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| 155. |
The whole length of a metre scale is divided into 500 equal parts then the smallest measurement that can be measured by using the scale is `"_______"`.A. (a) 0.5B. (b) 0.005 mC. (c ) 50 mmD. (d) 2 mm |
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Answer» Correct Answer - D Total distance = 1 m is divided into 500 equal parts, then the length of one division `1/500m = 0.002 " m "=2 " mm "`. |
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| 156. |
Which among the following is (are) the units(s) of pressure?A. (a) N `m^(-2)`B. (b) gwt `cm^(-2)`C. (c ) kgwt `m^(-2)`D. (d) All the above. |
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Answer» Correct Answer - D N `m^(-2)`, gwt `cm^(-2)` and kgwt `m^(-2)` are the units of pressure. |
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| 157. |
`(X^(2)/("Mass"))` has the dimensions of kinetic energy. Then X has the dimensions ofA. PressureB. ImpulseC. TorqueD. Force |
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Answer» Correct Answer - b `(X^(2))/(m)=K.E.=(1)/(2)mv^(2)` `therefore X^(2)=(1)/(2)m^(2)v^(2) therefore X=(1)/(sqrt(2))mv` Thus X has the dimensions of momentum i.e. [`M^(1)L^(1)T^(-1)]`. Out of the four quantities given above, Impulse = `(Fxxt)` has the dimensions `[L^(1)M^(1)T^(-2)xxT^(1)]=[L^(1)M^(1)T^(-1)]` `therefore` X has the dimensions of impulse. |
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| 158. |
The volume of a body having density 1 g `cm^(-3)` and mass 100 g is _____ `cm^(3)`.A. 100B. 50C. `(1)/(100)`D. `(1)/(50)` |
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Answer» Correct Answer - A `d=(m)/(V)` `V=(m)/(d)=(100)/(1)=100cm^(-3)` |
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| 159. |
A cylinder of height 1 m and radius 10 cm is fully filled with water, the volume of water is _____`m^(3)`.A. 3.14B. 0.314C. 0.0314D. 314 |
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Answer» Correct Answer - C Volume of cylinder `=pir^(2)h=pixx(0.1)^(2)xx1` `=0.0314m^(3)`. |
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| 160. |
Two spheres made of different materials have their masses in the rato of 1:2. If the diameter of the first sphere is equal to the radius of the second sphere, tehn determine the ratio dinsities volume of sphere = `(4)/(3) pir^(3)` |
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Answer» Density =` (mass)/(volume)` (ii) `(d_(1))/(d_(2))=((m_(1))/(v_(1)))/(m_(2)/(v_(2)))=(m_(1))/(m_(2))xx(v_(2))/(v_(1))` = `=(m_(1))/(m_(2))xx((4)/(3)pir_(2)^(3))/((4)/(3)pir_(1)^(3))=(m_(1))/(m_(2))xx((r_(2))/(r_(1)))^(3)` (iii) 4 : 1 |
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| 161. |
A physics student Ram was given an empty density bottle, a physical balance and a certain liquid. He first found the weight of empty density bottle to a be 50 gf When completely filled with a liquid, it weighs 130 gf. He calculated the density of the liquid. What could be his answer? |
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Answer» Mass of the eempty bottle = 50 " g " Mass of water = 100- 50= 50 " g " Mass of the liquid = 130 - 50 = 80 " g " Volume of the liquid = 50 " " `cm^(3) ltbr. (` :. Volume of 1 " g " water = 1 ml)` Density of the liquid = `"mass"/"volume" = 80/50 = 1.6 " g " cm^(-3)`. |
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| 162. |
The change in volume of a gas with change in temperature is plotted on a graph, as shown in he figure. Calculate the ratio of density at `50 ^(@)C and 100 ^(@)C` |
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Answer» Volume at `50 ^(@)C = 20 " "cm^(3)` Volume at `100 ^(@)C =30" "cm^(3)` Density = "mass"/"volume" Ratio of density `30/20 = 3/2 = 3 : 2` |
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| 163. |
The densities fo three substances A, B and C are given below. If equal voumes of A, B and C are taken, arrange then in increasing order of their masses. |
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Answer» `d_(A)= 2 " g " cm^(-3)` ` d_(B) = 1 " kg " m^(-3)` =`(1000)/(10^(6) cm^(3))=10^(-3) " g " cm^(-3)` `d_(c)=3 " g " m^(-3) =3 " g "xx10^(-6)cm^(-3)= 3xx 10^(-6) " g "cm^(-3)` `d_(A)gt d_(B) gt d_(c):. m_(A) gt m_(B) gt m_(C)` |
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| 164. |
The force F on a sphere of radius r moving in a medium with velocity v is given by `F = 6 pi eta rv`. The dimensions of `eta` areA. `[ML^(-3)]`B. `[MLT^(-2)]`C. `[MT^(-1)]`D. `[ML^(-1)T^(-1)]` |
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Answer» Correct Answer - D `f=6n etarv` `eta=(f)/(6pirv)=(MLT^(-2))/([L][LT^(-1)])=ML^(-1)T^(-1)` |
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| 165. |
The physical quantity which has dimensional formula as that of `("energy")/("mass"xx"length")` isA. ForceB. PowerC. PressureD. acceleration |
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Answer» Correct Answer - d `|("Energy")/("Mass "xx" Length")|=[("Force "xx" Displacement")/("Mass "xx" Length")]` `=[(M^(1)L^(1)T^(-2)xxL^(1))/(M^(1)xxL^(1))]=[L^(1)T^(-2)]`= [Acceleration] The physical quantity is acceleration. |
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| 166. |
Given that `y = a cos((t)/(P) - qx),` where t represents distance is metre. Which of the following statements is true ?A. The unit of x is same as that of qB. The unit of x is same as that of pC. The unit of t is same as that of qD. The unit of t is same as that of p |
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Answer» Correct Answer - D Since `(t)/(p)` shouls have unit of anfle i.e. unitless, hance unit of t is same as that of p. |
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| 167. |
A physical quantity Q is given by `Q=Q_(0)e^(-alphat^(2))` where t is the time and `alpha` is a constant. What is the dimensional formula for `alpha`?A. `[alpha]=[L^(0)M^(0)T^(0)]`B. `[alpha]=[L^(1)M^(0)T^(-1)]`C. `[alpha]=[L^(0)M^(0)T^(-2)]`D. `[alpha]=[L^(1)M^(1)T^(-1)]` |
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Answer» Correct Answer - c `Q=Q_(0)e^(-alphat^(2))` The power of an exponential quantity is dimensionless. `therefore [alphat^(2)]=[L^(0)M^(0)T^(0)]` `therefore alpha=(1)/(t^(2))=[(1)/(T^(2))]=[T^(-2)]` `therefore [alpha]=[M^(0)L^(0)T^(-2)]` |
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| 168. |
The dimensions of `a/b` in the equation `P=(a-t^(2))/(bx)` where `P` is pressure, `x` is distance and `t` is time areA. `[M^(1)L^(1)T^(-2)]`B. `[M^(0)L^(2)T^(-2)]`C. `[M^(1)L^(1)T^(1)]`D. `[M^(1)L^(0)T^(-2)]` |
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Answer» Correct Answer - d `P=(a-t^(2))/(bx)=(a)/(bx)-(t^(2))/(bx)` According to principle of homogeneity of dimensions, each term should have the same dimensions. `therefore [P]=[(a)/(bx)] therefore [("Force")/("Area")]=[(a)/(b)xx(1)/(x)]` `therefore [(M^(1)L^(1)T^(-2))/(L^(1)xxL^(1))]=[(a)/(b)xx(1)/(L)]` `therefore [(a)/(b)]=[M^(1)L^(-1)T^(-2)xxL^(1)]=[M^(1)L^(0)T^(-2)]` |
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| 169. |
One femtometer is equivalent to(A) 1015 m (B) 10-15 m (C) 10-12 m (D) 1012 m |
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Answer» Answer is (B) 10-15 m |
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| 170. |
The number of significant figures in 5.00456 isA. 5B. 3C. 4D. 6 |
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Answer» Correct Answer - d All zeros occurring between two non zero digits are significant. The given number has six significant figures. |
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| 171. |
to construct a seconds pendulum having a length of 100 cm the value of g should be ?A. `pi m s^(-2)`B. `100 pi m s^(-2)`C. `(1)/(pi^(2)) m s^(-2)`D. `pi^(2) ms^(-2)` |
| Answer» Correct Answer - D | |
| 172. |
when the jaws of a standard vernier calipers are closed if the nth division of the veriner scale coincides with the nth M.S.D the zero error is `"______"` |
| Answer» Correct Answer - `+n xx L.C. ` | |
| 173. |
When the jaws of a vernier calipers are in contact the eight division of the vernier scale coincides with the seventh division of the main scale . If N is the number of division on the vernier scale and least count x then the zero error corrections isA. `-8x`B. `(N-8)`C. `(N-8)x`D. `+8x` |
| Answer» Correct Answer - B | |
| 174. |
Light year is a unit for the measurement of .......(A) distance (B) time(C) temperature (D) luminous intensity |
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Answer» Answer is (A) distance |
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| 175. |
If the conductance of a conductor (G) is `(I^(2)t)/(W)` where I is current t is time and w is work done then the unit of conductance expressed in terms of fundamental units is `"________"`A. `(A^(2)s^(3))/(kg^(2)m) `B. `(A^(2)s^(3))/(kg^(-2)m)`C. `(A^(2)s^(3))/(kgm^(2))`D. `(A^(2)s^(3))/(kg^(2)m^(-2))` |
| Answer» Correct Answer - C | |
| 176. |
The sensitivity of a physical balance is increased by the use of `"________"`A. knife edgesB. leveling screwsC. plumb lineD. light pans |
| Answer» Correct Answer - A | |
| 177. |
A ............ is the interval from one noon to the next noon. (A) mean solar day (B) solar day (C) lunar day (D) day |
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Answer» Answer is (B) solar day |
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| 178. |
In cesium atomic clock ........ is used. (A) cesium-122 atom (B) cesium-132 atom (C) cesium-133 atom (D) cesium-134 atom |
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Answer» Answer is (C) (C) cesium-133 atom |
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| 179. |
The atomic, molecular and nuclear phenomena are the parts of ........... domain. (A) macroscopic (B) microscopic (C) mega scopic (D) electroscopic |
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Answer» Answer is (B) microscopic |
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| 180. |
In which of following system, scientific data can be exchanged between different parts of the world?(A) M.K.S. (B) C.G.S. (C) F.P.S. (D) S.I. |
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Answer» Answer is (D) S.I. |
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| 181. |
Out of the following units, which is NOT a fundamental unit?(A) newton (B) second (C) pound (D) kg |
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Answer» Answer is (A) newton |
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| 182. |
Temperature can be expressed as a derived quantity in terms of (A) length and mass (B) mass and time (C) length, mass and time (D) none of these |
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Answer» Answer is (D) none of these Temperature is a fundamental quantity. |
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| 183. |
The radius of the earth is 6400 km, the order of magnitude is (A) 107 m (B) 104 m (C) 103 m (D) 102 m |
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Answer» Answer is (A) 107 m |
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| 184. |
The least coun of a vernier calipers is 0.01 cm and if the zero mark of the vernier scale is right of zero of the main scale and the vernier coincidence is 7 when the jaws are in contact then the zero error is `"_______"` cm.A. `+6 xx 0.01`B. `+7 xx 0.01`C. `-7 xx 0.01`D. `- 6 xx 0.01` |
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Answer» Correct Answer - B The error is prositive `:. ` Positive zero error = + n `xx` L.C. =+ 7 `xx` 0.01 |
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| 185. |
The order of magnitude of 0.00045726 `m s^(-1)` is `"______"` |
| Answer» Correct Answer - `-4` | |
| 186. |
The number of significant figures in `11.118xx10^(-6)` V isA. 3B. 4C. 5D. 6 |
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Answer» Correct Answer - C Power of 10 is not a significant figure. :. So, there are 5 significant figures in given number. |
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| 187. |
Numerical value of the magnitude of a physical quantity isA. directly proportional to magnitude of the unitB. inversely proportional to magnitude of the unitC. independent of system of unitD. either (a) or (b) |
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Answer» Correct Answer - b The numerical value of the magnitude of a physical quantity is inversely proportional to the magnitude of the unit. |
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| 188. |
The zero error of the vernier calipers shown in the figure is _________. A. `+ 100 mum`B. `+ 0.01 cm`C. 0.1 mmD. All of the above |
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Answer» Correct Answer - D VCD for zero error = 4 Since the zero of the vernier scale is to the right of the zero of the main scale, the error is positive. ` therefore "zero error" = + n xx L.C` `=+ 4 xx 0.025 mm` ` =+ 0.100 mm` `=+ 0.01 cm =+ 100 mum` |
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| 189. |
Maran walks 1.5 km every day to reach the school while Mahizhan walks 1400 m. Who walks more distance and by how much? |
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Answer» Distance which Maran walks = 1.5 km = 1.5 × 1000 m = 1500 m The distance which Mahizhan walks = 1400 m. Here 1500 > 1400 ∴ Difference = 1500 – 1400 = 100 m. ∴ Maran walks more distance = 100 m. |
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| 190. |
In which of the following numerical values, all zeros are significant?A. `0.2020`B. `20.0`C. `2020`D. `None of these |
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Answer» Correct Answer - B Only in 20.2 all zero are significant becouse in this number zero lines between two digits. |
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| 191. |
How many glasses of the given capacity will fill a 2 litre jug?(i) 100 ml ……….(ii) 50 ml ……….(iii) 500 ml ………(iv) 1 l ………(v) 250 ml ……… |
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Answer» (i) 20 (ii) 40 (iii) 4 (iv) 2 (v) 8 |
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| 192. |
If you serve a cup of coffee measuring 150 ml each for 200 people find the volume of coffee needed in litres? |
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Answer» For one cup of coffee it needs 150 ml. For 200 people it needs 150 × 200 ml = 30000 ml = 30000 × 1/1000 l = 30 l Coffee needed = 30 l. |
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| 193. |
If N divisions on the vernier scale are equal to (N-2) divisions on the main scale then the least count Is `"______"` |
| Answer» Correct Answer - `(1 M.S.D)/(N)` | |
| 194. |
Compare and put > or < or = in the following:(i) 800 g + 150 g ____ 1 kg(ii) 600 ml + 400 ml ____ 1 l(iii) 6 m 25 cm ____ 600 cm + 25 cm(iv) 88 cm ____ 8 m 8 cm(v) 55 g ____ 550 mg |
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Answer» (i) 800 g + 150g < 3kg (ii) 600 ml + 400 ml = 1 l (iii) 6 m 25 cm = 600 cm + 25 cm (iv) 88 cm < 8 m 8 cm (v) 55 g > 550 mg |
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| 195. |
If the number of divisions on a vernier scale is 20 and the least count of the instrument is 0.025 mm, then 1 M.S.d. = __________ cm. |
| Answer» Correct Answer - 0.05 cm | |
| 196. |
How many metre are there in a light year?A. `5.5xx10^(15)m`B. `7.6xx10^(15)m`C. `9.46xx10^(15)m`D. `3.8xx10^(14)m` |
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Answer» Correct Answer - c Light year = Distance travelled by light in one year = Speed of light (in m/s) `xx` time (in sec) `=3xx10^(8)xx365xx30xx24xx60xx60` `=9.46xx10^(15)m` |
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| 197. |
The density of a body is 500 kg `m^(-3)`. Then its equivalent value in CGS system is______. |
| Answer» Correct Answer - o.5 g cm^(-3) | |
| 198. |
9 m 4 cm is equal to _____(a) 94 cm(b) 904 cm(c) 9.4 cm(d) 0.94 cm |
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Answer» (b) 904 cm 9 m 4 cm is equal to 904 cm. |
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| 199. |
The CGS unit of volume is____. |
| Answer» Correct Answer - `cm^(3)` | |
| 200. |
The density o a substance in CGS system is 4 g `cm^(-3)`. Its density in SI system is____ kg `m^(-3)`.A. 4B. 40C. 400D. 4000 |
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Answer» Correct Answer - D 1 g `cm^(-3)=1000" kg "m^(-3)` so, `2g" "cm^(-3)=2000" kg "m^(-3)`. |
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