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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.
| 601. |
When ultraviolet radiation of a certain frequency falls on a potassium target, the photoelectrons released can be stopped completely by a retarding potential of 0.6 V. If the frequency of the radiation is increased by 10%, this stopping potential rises to 0.9 V. The work function of potassium isA. 2.0 eVB. 2.4 eVC. 3.0 eVD. 2.8 eV |
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Answer» Correct Answer - B |
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| 602. |
A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque, thenA. only half of the image will be visibleB. the image position shifts towards the lensC. the image position shifts away from the lensD. the brightness of the image reduces |
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Answer» Correct Answer - D |
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| 603. |
Startification is more common is which of the following ?A. Deciduous forestB. Tropical rain forestC. Temperate forestD. Tropical savannah |
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Answer» Correct Answer - B Tropical rain rofest shows vertical zonation i.e., stratification. |
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| 604. |
Which ONE of the following statements is TRUE with respect to human ovary? (A) Estrogen is secreted by Graafian follicles and progesterone by corpus luteum (B) Estrogen is secreted by corpus luteum and progesterone by Graafian follicles (C) Both estrogen and progesterone are secreted by Graafian follicles (D) Both estrogen and progesterone are secreted by corpus luteum |
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Answer» Correct option (A) Estrogen is secreted by Graafian follicles and progesterone by corpus luteum Explanation: During puberty age hypothalamus releases GnRH harmone that promote secretion of gonadotrophins (FSH and LH) from anterior pituitary gland. FSH promotes growth and development of follicles in ovary two produce estrogen hormone, where as LH promotes ovulation and carpous leuteum formation which produces progesterone hormone that maintain endometrium of uterus. |
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| 605. |
Which ONE of the following statements is INCORRECT with respect to human antibodies ? (A) They can neutralize microbes (B) They are synthesized by T cells (C) They are made up of four polypeptide chains (D) Milk contains antibodies |
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Answer» Correct option (B) They are synthesized by T cells Explanation: Antibodies synthesized by ‘B’ cells not by T-cells. ‘B’ cells produced humoral immunity.
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| 606. |
Which ONE of the following statements is INCORRECT with respect to human antibodies ?A. They can neutralize microbesB. They are synthesised by T cellsC. They are made up of four polypeptide chainsD. Milk contains antibodies |
| Answer» Correct Answer - B | |
| 607. |
Which ONE of the following statements is TRUE about the Golgi apparatus ? (A) It is found only in animals(B) It is found only in prokaryotes (C) It modifies and targets proteins to the plasma membrane (D) It is a site for ATP production |
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Answer» Correct option (C) It modifies and targets proteins to the plasma membrane Explanation: Golgi apparatus found in animals & also in plants & fungi as dictyosome. Golgi is respobsible for glycosylation protein and lipids. The glycosylated proteins are modified proteins of plams membrane.
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| 608. |
A researcher found petridied disnosaur faeces. Which ONE of the following is unlikely to be found in this fossil ?A. Decayed conifer woodB. BambooC. CycadD. Giant fern |
| Answer» Correct Answer - B | |
| 609. |
Concentration (%) of NaCl isotonic to human blood isA. 0.085-0.09%B. 1.7-1.8%C. 3.4-3.6%D. 0.85-0.9% |
| Answer» Correct Answer - D | |
| 610. |
Creutzfeldt Jakob Disease (CJD) is a transmissible disease caused by a (A) virus (B) bacterium (C) fungus (D) misfolded protein |
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Answer» Correct option (D) misfolded protein Explanation: It is degenerative fatal brain disorder, in the early stage of the deseases pupil have failing memory, behaviour changes and lack of coordination.
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| 611. |
Creutzfeldt Jakob Disease (CJD) is a transmissible disease caused by aA. VirusB. BacteriumC. FungusD. misfolded protein |
| Answer» Correct Answer - D | |
| 612. |
A coffee maker makes coffee by passing steam through a mixture of coffee powder, milk and water. If the steam is mixed at the rate of `50 g `per minute in a mug containing `500 g` of mixture, then it takes about `t_(0)` seconds to make coffee at `70^(@)C` when the initial temperature of the mixture is `25^(@)C`. The value of `t_(0)` is close to (ratio of latent heat of evaporation to specific heat of water is `540^(@)C`) and specific heat of the mixture can taken to be the same as that of water)A. 30B. 45C. 60D. 90 |
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Answer» Correct Answer - B |
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| 613. |
Diabetes insipidus is due to –(A) hypersecretion of vasopressin (B) hyposecretion of insulin (C) hypersecretion of insulin (D) hyposecretion of vasopressin |
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Answer» Correct :- (D) hyposecretion of vasopressin Explanation :- Diabetes incipidus (DI) is a condition characterized by excessive thirst and excretion of large amounts of severely diluted urine. DI is caused by a deficiency of vasopressin also known as antidiuretic hormone. |
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| 614. |
Fossils are most often found in which kind of rocks ? (A) meteorites (B) sedimentary rocks (C) igneous rocks (D) metamorphic rocks |
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Answer» Correct :- (B) sedimentary rocks Explanation :- Sedimentary rocks are type of rock that are formed by deposition of material at the earth's surface and within bodies of water. It forms only 8% of total volume of crust fossils are mostly found in these. |
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| 615. |
A box filled with water has a small hole on its side near the bottom. It is dropped from the top of a tower. As it falls, a camera attached on the side of the box records the shape of the water stream coming out of the hole. The resulting video will show (A) the water coming down forming a parabolic stream (B) the water going up forming a parabolic stream (C) the water coming out in a straight line (D) no water coming out |
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Answer» The Correct option is (D) no water coming out |
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| 616. |
A very large block of ice of the size of a volleyball court and of uniform thickness of `8m` is floating on water. A person standing near its edge wishes to fetch a bucketful of water using a rope. The smallest length of rope required for this is aboutA. `3.6m`B. `1.8m`C. `0.9m`D. `0.4m` |
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Answer» Correct Answer - C |
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| 617. |
A desert lizard (an ectotherm ) and a mouse (an endotherm) are placed inside a chamber at `15^(@)C` and their body temperature [T(L) for the lizard and T(M) for the mouse] and metabolic rates [ML(L) for the lizard nad M(M) for the mouses] are monitored. Which one of the following is correct-A. T(L) and M(L) will fall while T(M) will increaseB. T(L) and M(L) will increase while T(M) and M(M) will fallC. T(L) and M(L) will fall, T(M) will remain same and M(M) will increaseD. T(L) and M(L) will remain same and T(M) and M(M) will decrease |
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Answer» Correct Answer - C Desert lizard is an ectotherm (poikiliotherm ) whose body temperature vaires according to enviromental temperature . So, at `15^(@)C` T(L) will fal due ot fall in T(M) While mouse is a endotherm (Homeotherm) whose body temperature remains constant always due to variation is metabolic rate In homeotherms metabolic rate is inversely proportinal to enviromental tempertue. So at `15^(@)C` T(M) remain same and M(M) will increased. |
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| 618. |
Consider the equation (1+ a + b)2 = 3(1+ a2 + b2 ), where a , b are real numbers. Then (A) there is no solution pair (a, b) (B) there are infinitely many solution pairs (a, b) (C) there are exactly two solution pairs (a, b) (D) there is exactly one solution pair (a, b) |
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Answer» Correct Option :- (D) there is exactly one solution pair (a , b) Explanation :- (1 + a + b)2 = 3 (1 + a2 + b2 ) ⇒ 1 • a + a • b + 1 • b = 12 + a2 + b2 ⇒ 1 = a = b exactly one pair. |
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| 619. |
Let t be real number such that `t^2=at+b` for some positive integers a and b. Then forany choice of positive integers a and b.`t^3` is never equal toA. 4t+3B. 8t+5C. 10t+3D. 6t+5 |
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Answer» Correct Answer - b `t^(2)=at+b,a,bin 1^(+)` `t^(3)=at^(2)+bt` a(at +b)+bt `a^(2)t+bt=bt` `Rightarrow t^(3)= (a^(2)+b) t +ab` , check possibilty for a,b, `in I^(+)` from options. `a^(2)+b=4` ab=3 possible (b) `a^(2)+b=8` ab=5 not possible (c) `a^(2) +b=10` ab = 3 possible (d) `a^(2) +b=6` ab=5 possible |
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| 620. |
Consider the equation `(1+a+b)^2=3(1+a^2+b^2)`. where a, b are real numbers.thenA. There is no solution pair (a,b)B. there are infinitely many solution pairs (a,b)C. there are exactly two solution pairs (a,b)D. there is exactly one solution pair (a,b) |
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Answer» Correct Answer - d `(1+a+b)^(2)=3 (1+a^(2)+b^(2))` `1.a.+a.b+1.b=1^(2)+a^(2)+b^(2)` 1=a=b exactly one pair. |
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| 621. |
The electron in hydrogen atom is in the first Bohr orbit `(n = 1)`. The ratio of transition energies, `E(n-1 rarr n =3)` to `E(n=1 rarr n=2)`, is-A. 32/27B. 16/27C. 32/9D. `8//9` |
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Answer» Correct Answer - A `DeltaE=13.6 (1/n_(1)^(2)-1/n_(2)^(2))eV//"atom" , (DeltaE_(1 rarr 3))/(DeltaE_(1 rarr 2))=(1/1^(2)-1/3^(2))/(1/1^(2)-1/2^(2))=.32/27` |
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| 622. |
If `E_(Fe^(2+)//Fe)^(@)=-0.440 V` and `E_(Fe^(3+)//Fe^(2+))^(@)=0.770 V`, then `E_(Fe^(3+)//Fe)^(@)` is -A. 0.330 VB. `-0.037 V`C. `-0.330 V`D. `-1.210 V` |
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Answer» Correct Answer - B `{:(Fe^(+3)//Fe,),(Fe^(+2)+2e^(-) rarr Fe,E^(@)=-0.44),(Fe^(+3)+e^(-) rarr Fe^(+2),E^(@)=0.770),(ulbar(Fe^(+3)+3e^(-) rarr Fe),E^(@)=?):}` `E^(@)=(n_(1)E_(1)^(@)+n_(2)E_(2)^(@))/n_(3)=(2(-0.44)+1xx(0.770))/(3)=(-0.88+0.770)/(3)=-0.037` volt |
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| 623. |
The arithemetic mean and the geometric mean of two distinct 2-digit numbers x and y are two integers one of which can be obtained by reserving the digits of the other (in base 10 representation). Then x + y equalsA. 82B. 116C. 130D. 148 |
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Answer» Correct Answer - C `(x+y)/(2)=10 a+b, sqrt(xy)=10 b+a" "(a, b in N)` `xy=(10b+a)^(2)` `(x-y)^(2)=4(11a+11b)(9a-9b)` `=4.11 . (a+b). 9(a-b)` `rArr a+b=11, a-b=1` `a=6, b=5` `((x-y)^(2)" is perfect square of an integer")` `x+y=130` |
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| 624. |
In the circuit shown, the switch is closed at time t = 0. Which of the graphs shown below best represents the voltage across the inductor, as seen on an oscilloscope ? A. IB. IIC. IIID. IV |
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Answer» Correct Answer - D |
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| 625. |
The circuit shown consists of a switch (S), a battery (B) of emf E, a resistance R, and an inductor L. The current in the circuit at the instant the switch is closed is- (A) E/R (B) E/R(1 – e) (C) ∞ (D) 0 |
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Answer» Correct Option :- (D) 0 Explanation :- Using the equation I = I0 (1 − e−t/tL ) Put t = 0 we get I = 0 Just when the battery is closed inductor provides infinite resistance to the current flow ∴ current is zero initially. |
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| 626. |
Consider a uniform spherical volume charge distribution of radius R. Which of the following graphs correctly represents the magnitude of the electric field E as a distance r from the center of the sphere ?A. B. C. D. |
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Answer» Correct Answer - A |
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| 627. |
The circuit shown consists of a switch (S), a battery (B) of emf E, a resistance R, and an inductor L. The current in the circuit at the instant the switch is closed is-A. `E//R`B. `E//R(1-e)`C. `oo`D. 0 |
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Answer» Correct Answer - D |
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| 628. |
Let a and b be two positive real numbers such that `a + 2b |
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Answer» Correct Answer - b `a+2ble1` `A_(1) =pia^(2)b^(6)` `A_(2)=pib^(4)` `Rightarrow (A_(1))/(A_(2))=a^(2)b^(2)` `& 1& 1ge2bge2sqrt(2ab)(AMgeGM)` `1ge2sqrt(2ab)` `1ge4.2ab` `Rightarrow1/64gea^(2)b^(2)` |
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| 629. |
Consider a cuboid all of whose edges are integers and whose base is square. Suppose the sum of all its edges is numerically equal to the sum of the areas of alll its six faces. Then the sum of all its edges is.A. 12B. 18C. 24D. 36 |
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Answer» Correct Answer - c Let sides are a,a,h `So, 4a+4h+4a=2(a^(2)+ah+ah)` `Rightarrow a^(2)-4a=2h(1-a)` `(a^(2)-1)+1-4(a-1)-4=2h(1-a)` `(a-1) (a+1)-4 (a-1)-3=2h(1-a)` `Rightarrow2h= 3/(a-1)+4-(a+1)` Soa=2 & h=2 are the only integral solution (a & h are positive integers). |
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| 630. |
Let `f` be a funcation defined on the set of all positive integers such that `f (x) +f(y) ` for all postive integers x,y,if f (12) =24 and f(8) =15 the value of f(48) isA. 31B. 32C. 33D. 34 |
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Answer» Correct Answer - d f (x y) = f(x) +f(y) f(x) =`log_(a)x` so , f(12) =24 `Rightarrow log_(a) 12=24` `Rightarrow 12 = a^(24)& f(8)=15` `Rightarrow log_(a) 8 =15` `Rightarrow 8=a^(15) Rightarrow 2=a^(5) ` So, f(48) = `log_(a)48=log_(a) 12 + log_(a)4` `log_(a)12 + log_(a)2^(2)` 24+2.5 34 |
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| 631. |
The number of digits in the decimal expansion of 165 5 16 is (A) 16 (B) 17 (C) 18 (D) 19 |
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Answer» Correct Option :- (C) 18 Explanation :- 165 516 = 16 × 164 × 516 = 16 × 1016 It is 18 digit number |
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| 632. |
The number of digits in the decimal expansion of `16^55^16` isA. 16B. 17C. 18D. 19 |
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Answer» Correct Answer - c `16^5 5^(16)` `=16xx16^(4)xx5^(16)` `16xx10^(16)` it is 18 digit number |
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| 633. |
A solid hemisphsere is mounted on a solid cylinder, both having equla radii. If the whole solid is to have a fixed surface are and the maximum possible volume, then the ratio of the height of the cylinder to the common radius isA. `1:1`B. `1:2`C. `2:1`D. `sqrt(2):1` |
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Answer» Correct Answer - A `S=2 pi R^(2)+2 pi Rh +pi R^(2)` (R= radius of hemisphere & cylinder) `V=(2)/(3)pi R^(3)+piR^(2)H` `V=(2)/(3)pr R^(3)+ piR^(2)xx((5-3 pi R^(2))/(2 pi R))` `(dV)/(dR)= 2 pi R^(2)+(5)/(2)-(9 pi)/(2) R^(2)` For maximum & minimum `(dV)/(dR)=0` `5pi R^(2)=S` `5piR^(2)=3piR^(2)+2 piRh` `h:H=1:1` |
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| 634. |
Let x,y,z be positive reals , which of the which following imples `x=y=z?`A. `x^(3) +y^(3) +z^(3) =3xyz`B. `x^(3) +y^(3)z +yz^(2) =3xyz`C. `x^(3) +y^(3)z +z^(2)x =3xyz`D. `(x+y+z)^(3) =27xyz` |
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Answer» Correct Answer - B `(i) (x^(3) +y^(3) +z^(3))/(3) =(x^(3) y^(3) z^(3) )^(1//3)` hence x=y=z { AM=GM} (ii) `(x^(3) +y^(2) z+yz^(2) )/(3) le (x^(3) y^(3) z^(3) ) ^(1//3)(AM=GM)` `(iii) x^(3) +y^(2) z+x=3xuyz` `(x^(3) +(y^(2) z)/(2) +(y^(2)z)/(2) +z^(2) x)/(4) ge((x^(4) y^(4) z^(4) )/(4))^(1//4)` `implies (3xyz)/(4) ge((xyz))/(sqrt(2))`Not possible `(iv) (x+y+z)/(3) ge (xyz)^(1//3) implies (x+y+z) ^(1//3) implies (x+y+z)^(3)=27xyz.` |
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| 635. |
I carried 1000 kg of watermelon in summer by train. In the beginning, the water content was 99%. By the time I reached the destination, the water content had dropped to 98%. The reduction in the weight of the watermelon was-A. 10 kgB. 50 kgC. 100 kgD. 500 kg |
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Answer» Correct Answer - D Initially `1000kg [ 990kg " water"+10 kg" rest"]` Now x kg melon `[(98x)/(100)" water"+(2x)/(100)" rest"]` Weight of solid part should remain same `(2x)/(100)=10 rArr x =500` Weight reduction 1000-500=500kg |
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| 636. |
At 298 K, assuming ideal behaviour, the average kinetic energy of a deuterium molecule isA. two times that of a hydrogen moleculeB. four times that of a hydrogen moleculeC. half of that of a hydrogen moleculeD. same as that of a hydrogen molecule |
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Answer» Correct Answer - D `"(K.E)"_("average")=3/2` kT i.e., average kinetic depends only on temperature. |
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| 637. |
Which of the following entities causes syphillis ?A. Treponema pallidumB. Neisseria gonorrhoeaC. HIVD. Hepatits B |
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Answer» Correct Answer - a Causative agent of syphilis is Treponema Pallidum |
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| 638. |
When a pure bred, red flower-producing plant of genotype RR is crossed with a pure bred, white flower-producing plant of genotype rr, all the `F_(1)` plants produced pink flowers If all the plants in each generation form `F_(1) to F_(6)` are selfed, what will be the percentage of plant with red and white flowers in the final population consisting of a large number of individuals ? (Consider that flower colour has no effect on reproduction and survival.)A. `3-4`B. `12-13`C. `49-51`D. `97-100` |
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Answer» Correct Answer - D After selfing homozygous indivisiual produces All white & red offspring and heterozygous also produces 50%. Red & White flower. |
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| 639. |
A breeder crossed a pure bred tall plant having white flowers toa pure short plant having bule flowers. He obtained 202 `F_(1)` progeny and found and found that they are all tall having white flowers. Upon selfing these these `F_(1)` Plants, he obtained a progeny of 2160 plants. Approximately, how many of these are likely to be short and having blue flower?A. 1215B. 405C. 540D. 135 |
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Answer» Correct Answer - d TW-9, Tw-3 tW-3 tw-1 according to ratio of dihybrid cross. The total number of short and blue flowered plants is- `1/16xx2130=1080/8=135` |
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| 640. |
Match the different types of heart given in column A with organisms given in the column B. Choose the correct combination. Column AColumn BP. Neurogenic hearti. HumanQ. Bronchial heartii. King crabR. Pulmonary heartiii. Shark(A) P-ii, Q-iii, R-i (B) P-iii, Q-ii, R-i (C) P-i, Q-iii, R-ii (D) P-ii, Q-i, R-iii |
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Answer» Correct Option :- (A) P-ii, Q-iii, R-i Explanation :- – Neurogenic Heart → King crab [Arthropod] – Bronchial Heart → Shark [Single circulation] – Pulmonary Heart → Human |
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| 641. |
Restriction endonucleses are enzymes that are used by biotechnologists to -A. cut DNA at specific base sequenceB. join fragments of DNAC. digest DNA form the 3endD. digest DNA form the 5 end |
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Answer» Correct Answer - A Restriction endonuclese form breaks the phosphodiester bond on specific pallindromic sequences . |
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| 642. |
The heat of an amphibian is usually – (A) two chambered (B) three chambered (C) four chambered (D) three and half chambered |
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Answer» Correct option (B) three chambered Explanation: The amphibian heart is 3 chambered having 2 auricles + one ventricle |
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| 643. |
Myeloid tissue is a type of-A. haematopoietic tissueB. cartilage tissueC. muscular tissueD. areolar tissue |
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Answer» Correct Answer - A Myeloid tissue is a biologic tissue with the ability to perform hemotopiesis. It is mainly found as the red bone moved in bone and is after, synonymous with this |
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| 644. |
which ,among grass , goat , tiger and vulture , in a food chain , will have the maximum concentration of harmful chemicals in its body due to contamination of pesticides in the soil ?A. Grass since it grows in the contaminated soilB. Goat since it eats the grassC. Tiger since it feeds on the goat which in turn eats the goat , which feeds on the grassD. Vulture since it eats the tiger , which in turn eats the goat , which eats the grass |
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Answer» Correct Answer - D Vulture will have the maximum concentration of pesticide because it feeds on tiger which in term eat the goat which eat the grass . |
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| 645. |
Two masses `m_(1)` and `m_(2)` connected by a spring of spring constant k rest on a frictionless surface. If the masses are pulled apart and let go, the time period of oscillation is-A. `T=2pisqrt((1)/(k)((m_(1)m_(2))/(m_(1)+m_(2))))`B. `T=2pisqrt((1)/(k)((m_(1)+m_(2))/(m_(1)m_(2))))`C. `T=2pisqrt(((m_(1))/(k)))`D. `T=2pisqrt(((m_(2))/(k)))` |
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Answer» Correct Answer - A |
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| 646. |
The metal with the highest oxidation state presnt in `K_(2)CrO_(4),NbCl_(5) and MnO_(2)` is -A. NbB. MnC. KD. Cr |
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Answer» Correct Answer - D `K_(2)CrO_(4)rArrCr^(+6)` (highest oxidation taste) `NbCl_(5)rArrNb^(+5)` `MnO_(2)rArrMn^(4+)` |
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| 647. |
Let Sn = ∑k k∈[k=1,n] denote the sum of the first n positive integers. The numbers S1, S2, S3,…S99 are written on 99 cards. The probability of drawing a card with an even number written on it is – (A) 1/2 (B) 49/100 (C) 49/99 (D) 48/99 |
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Answer» Correct :- (C) 49/99 Explanation :- 1,3,6,10,15,21,28,36,45, 55,66,78,91,105 till 98 terms 48 terms are even and 48 terms odd 99th term = 99 x 100/2 =even Total even terms = 48 + 1 = 49 Probability =49/99 |
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| 648. |
A juggler tosses a ball up in the air with initial speed u. At the instant it reaches its maximum height H, he tosses up a second ball with the same initial speed. The two balls will collide at a heightA. `(H)/(4)`B. `(H)/(2)`C. `(3H)/(2)`D. `sqrt((3)/(4))H` |
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Answer» Correct Answer - C |
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| 649. |
Air (density `rho`) is the being down on soap film (surface tension `T`) by pipe of radius `R` with its opening right next to the film. The film is deformed and a bubble detached from the film when the shape of the deformed surface is a hemisphere. Given that the dynamic pressure on the film due to the air blown at speed `v` is `1/2 rho v^(2)` the speed at which the bubble is formed isA. `sqrt(T/(rhoR))`B. `sqrt((2T)/(rho R))`C. `sqrt((4T)/(rho R))`D. `sqt((8T)/(rhoR)` |
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Answer» Correct Answer - D |
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| 650. |
A rigid body in the shape of a "V" has two equal arms made of uniform rods. What must the angle between the two rods be so that when the body is suspended from one end, the other arm is horizontal ?A. `cos^(-1)((1)/(3))`B. `cos^(-1)((1)/(2))`C. `cos^(-1)((1)/(4))`D. `cos^(-1)((1)/(6))` |
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Answer» Correct Answer - A |
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