Related InterviewSolutions

• Mucosal epithelium lining of stomach is protected from concentrated hydrochloric acid byA. Mucus and bicarbonatesB. PeptidasesC. LipasesD. Carbonates and sodium ions.
• Iron, once dipped in concentrated `H_(2)SO_(4)`, does not displace copper from copper sulphate solution, becauseA. it is less reactive than copperB. a layer of sulphate is deposited on itC. a layer of oxide is deposited on itD. none of the above
• On the basis of detail given about two measuring instruments, select the corect statement (i) vernier calliper having main scale of divison = 0.05 cm and vernier scale divison = `2.45/50`cm screw gauge having pitch 0.5 mmand its circular scale divison measures 0.1 mmA. Both the instruments have same least countB. Least count of screw gauge is lesser than that of vernier callipersC. Both the instruments have same least count but screw gauge is more preciseD. Both the instruments have different least count and screw gauge is more precise
• A student performed the experiment of determination of focal length of a concave mirror by `u-v` method using an optical bench of length 1.5 meter. The focal length of the mirror used is 24 cm. The maximum error in the location of the image can be 0.2 cm. The 5 sets of `(u,v)` values recorded by the student (in cm) are: `(42,56),(48,48),(60,40),(66,33),(78,39)` . The data set (s) that cannot come from experiment and is (are) incorrectly recorded, is (are)A. (42,56)B. (48,48)C. (66,32)D. (78,39)
• Humus is good for plant growth becauseA. It improves physical condition of soilB. It makes the soil porousC. It increases water holding and aeration of soilD. All the above
• An `(alpha)`-particle and a proton are both simultaneously projected in opposite direction into a region of constant magnetic field perpendicular to the direction of the field. After some time it is found that the velocity of the `(alpha)`-particle has changed in a direction by `45^(@)`. Then at this time, the angle between velocity vectors of `(alpha)`-particle and proton isA. `90^(@)`B. `45^(@)`C. `45^(@)+90^(@)`D. `((45^(@)+90^(@)))/(2)`
• The plane face of a plano convex lens is silvered.If `mu`be the refrative index and R, the radius of curvature of curved suraface, then system will behave like a concave mirror of curvatureA. `muR`B. `(R)/((mu-1))`C. `(R^(2))/(mu)`D. `[((mu+1))/((mu-1))]R`
• Two organ pipes are emitting their fundamental notes, when each closed at end, give 5 beat/s if their foundamental frequencies are 250 Hz and 255 Hz. Then find the ratio of their lenghts.A. `(49)/(50)`B. `(49)/(51)`C. `(50)/(51)`D. `(51)/(50)`
• Which of the following bonds are present in a DNA double helix ? a. Hydrogen bond b. Peptide bond c. Glycosidic bond d. Phosphodiester bondA. a,b and dB. a,c and dC. c and d onlyD. a and b
• Assertion : Enzymes lower the activation energy. Reason : A substrate molecule can be acted upon by a particular enzyme.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is falseD. If both assertion and reason are false