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51.

Statement 1: Long distance radio broadcasts use short wave bands. Statement 2: Short wavelength signals are reflected by the ionosphere.A. Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.B. Both Statement-1 and Statement-2 are true but Statement -2 is not the correct explanation of Statement-1C. Statement-1 is true but Statement-2 is false.D. Statement-1 is false but Statement-2 is true.

Answer» Correct Answer - A
Discussion
52.

Statement 1: Sky wave communication is not suitable for frequencies greater than 30 MHz Statement 2: High frequency signals die out before reaching the ionosphere.A. Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.B. Both Statement-1 and Statement-2 are true but Statement -2 is not the correct explanation of Statement-1C. Statement-1 is true but Statement-2 is false.D. Statement-1 is false but Statement-2 is true.

Answer» Correct Answer - C
Discussion
53.

A.A diode merely converts A.C. into D.C.B.A diode cannot given amplifiction.A. Both A and B are correctB. A incorrect B is wrongC. A is wrong B is correctD. None

Answer» Correct Answer - A
Discussion
54.

Which of the following statements is // are correct?A. A real gas approaches perfect gas behaviour at high temperature and low pressureB. Molecules of ideal gas posses only translational kinetic energy at all temperaturesC. An ideal gas would never condense into the liquid stateD. The average translational kinetic energy per molecule at any given temperature is independent of the type of ideal gas

Answer» Correct Answer - A::C::D
Discussion
55.

In the circuit shown, some potential difference is applied between A and B If C is joined to D A. no charge will flow between C and DB. some charge will flow between C and DC. the equivalent capacitance between A and B will not changeD. the equivalent capacitance between A and B will change.

Answer» Correct Answer - A::C
Discussion
56.

An electric box contains three e.m.f sources as shown in the figure A. emf of the electric box is `1/3` VB. point B is at higher potential than point AC. internal resistance of the box is `5/3Omega`D. terminal voltage for `2V` source is `4/3`v

Answer» Correct Answer - A::B::C::D
Discussion
57.

The circuit shown in figure consisting of three identical lamps and two coils is connected to a direct current source. The ohmic resistance of the coils is negligible After some time switch S is opened. Which of the following statement(s) is // are correct for the instant immediately after opening the switch? A. All the lamps are turned offB. Brightness of `B_(2) & B_(3)` remains unchangedC. Brightness of `B_(1)` suddenly increasesD. Insufficient data to draw any conclusion.

Answer» Correct Answer - B::C
Discussion
58.

The figure shows P - V diagram of a thermodynamic cycle If `T_(A),T_(B),T_(C)andT_(D)` are the respective temperature at A,B,C and D. Then, choose the correct statement `T_(A)=T_(0)`A. The maximum temperature during the cycle accurs at C.B. `T_(D)=3T_(0)`C. `T_(B)=2T_(0)`D. all the above

Answer» Correct Answer - D
Discussion