JEE Full Syllabus MCQs Set 03

Question. If there is an error of 1% in calculation of mass of disc & 1.5 % error in radius, then % error in moment of inertia about an axis tangent to disc is :
(a) 4%
(b) 5%
(c) 2.5 %
(d) 3.5%

Answer: A

Question. Unpolarized light falls on two polarizing sheets placed one after another. What should be the angle between pass axis of the sheets so that final transmitted light have one fourth intensity of incident light?
(a) None of these
(b) 0°
(c) 30°
(d) 60°

Answer: A

Question. A hydrogen atom at rest emits a photon during its transition from n = 2 to n = 1. Choose the INCORRECT statement.
(a) Kinetic energy of recoil H-atom will be equal to energy of emitted photon
(b) Kinetic energy of recoil H-atom will be less than 10.2 eV
(c) Energy of emitted photon will be less than 10.2 eV
(d) De-Broglie wavelength of hydrogen atom during recoil will be same as wavelength of emitted photon

Answer: A

Question. Resolving power of a microscope can NOT be increased by
(a) Decreasing the aperture, keeping focal length same
(b) Decreasing the focal length of objective, keeping aperture same
(c) Decreasing the wavelength of light used
(d) Using "oil immersion objective"

Answer: A

Question. Brakes are being applied in a car moving with speed 20 m/s which produces a retardation of 5 m/s2. The distance travelled by car till it stops is :
(a) 40 m
(b) 20 m
(c) 30 m
(d) 50 m

Answer: A

Question. A particle is revolving in a circle of radius 2m with angular velocity w = t2 – 4t + 8 rad/s. The time when speed of the particle becomes 8 m/s is
(a) 2 sec
(b) 4 sec
(c) 1 sec
(d) 3 sec

Answer: A

Question. If electronic charge on electron alone is doubled then as per bohr model, K.E. of an e– revolving in the nth orbit becomes
(a) Becomes 4 times
(b) Becomes 16 times
(c) Becomes 2 times
(d) Remains same

Answer: A

Question. A monoatomic gas is taken through a process TP–1/3 = constant. If heat is given to the gas :
(a) Its temperature will decrease
(b) Cann't be predicted
(c) Its temperature will increase
(d) Its temperature remains constant

Answer: A

Question. When a load W is hung from a wire of length 2L, it just breaks. Now this wire is completely melted and a new wire of length L is formed. If the load W is hung from this new wire
(a) It will definitely not break
(b) It will definitely break
(c) cannot be predicted
(d) None of these

Answer: A

Question. A string of length 1m fixed at both ends is vibrating in 3rd overtone. Tension in string is 200 N and linear mass density is 5 gm/m. Frequency of these vibrations is
(a) 400 Hz
(b) 250 Hz
(c) 200 Hz
(d) 300 Hz

Answer: A

Question. Two balls in free space are colliding with each other. Which of the following statement regarding linear momentum conservation of the system is true ?
(a) is conserved
(b) is not conserved
(c) Will depend on type of collision (head on or oblique)
(d) Will depend on type of collision (elastic or inelastic)

Answer: A

Question. 60 ml NaOH solution is required for complete neutralisation of 0.98 gm orthophosphoric acid. The concentration of NaOH solution is
(a) 0.5 M
(b) 1.5 M
(c) 0.167 M
(d) 0.33 M

Answer: A

Question. The number of 3c-2e bond and 2c-2e bond present in Be2(CH3)4 are _____ and _____respectively
(a) 2, 14
(b) 2, 10
(c) 14, 2
(d) 2, 12

Answer: A

Question. A gaseous mixture contains equal masses of dihydrogen gas, dioxygen gas and methane gas at a total pressure of 380 torr. The partial pressure of methane gas is
(a) 40 torr
(b) 30 torr
(c) 20 torr
(d) 320 torr

Answer: A

Question. For hydrogen like atoms, the average distance of electron from nucleus for the orbitals belonging to the 4th orbit, is minimum for :
(a) 4f
(b) 4d
(c) 4p
(d) 4s

Answer: A

Question. "On moving left to right ionisation energy increases due to increasing Zeff" In which of the following pair above statement is NOT CORRECT?
(a) Mg, Al
(b) B, C
(c) Na, Mg
(d) O, F

Answer: A

Question. Van-Arkel process and Mond's process are used for refining for which of the metals respectively
(a) Ti and Ni
(b) Zr and Ti
(c) Ni and Zr
(d) Ni and Fe

Answer: A

Question. Which of the following vitamin is water soluble?
(a) Vitamin-C
(b) Vitamin-D
(c) Vitamin-K
(d) Vitamin-E

Answer: A

Question. Which of the following statement is INCORRECT?
(a) Lu(OH)3 is more basic compared to La(OH)3.
(b) Lanthanide carbide (LnC2) produces on hydrolysis
(c) CeS is used to make Crucible
(d) Misch-metal is used for making Cigarette lighter

Answer: A

Question. The only INCORRECT statement for cubic metallic crystal is
(a) For same edge-length of unit cell, the atomic radius is minimum for SC
(b) For the same atomic radius, the edge length of unit cell is minimum for SC
(c) Co-ordination number is minimum for simple cubic (SC)
(d) Packing efficiency (or fraction) is maximum for FCC

Answer: A

Question. Which of the following is electron precise type of hydride.
(a) GeH4
(b) NH3
(c) CaH2
(d) CuH

Answer: A

Question. The boiling point of 0.2m- aq. urea solution is (Kb of water = 0.52 K.kg.mol–1)
(a) 100.104ºC
(b) –0.104ºC
(c) 101.04ºC
(d) 273.104ºC

Answer: A

Question. Opticaly inactive amino acid is ?
(a) Glycine
(b) Proline
(c) Alanine
(d) Histidine

Answer: A

Question. NaHSO3 is heated to produce H2O and compound 'A'. Which of the following statement is INCORRECT about 'A'.
(a) A has S–O–S type of linkage
(b) 'S' atoms have sp3 hybridisation
(c) 'A' has S–S linkage
(d) One 'S' has one lone pair

Answer: A

Question. The eccentricity of an ellipse whose length of latus rectum is equal to distance between its foci, is
(a) 2sin18°
(b) sin18°
(c) 2cos36°
(d) cos36°

Answer: B

Question. The equation of the plane passing through the line of intesection of the planes x + y + z = 5 and 2x + 3y + 4z + 5 = 0 and perpendicular to the plane x + y + z = 5 is
(a) x – z = 20
(b) x + y – 2z = 20
(c) x – z = 10
(d) x + y – 2z = 10

Answer: A