List of practice Questions

A transmitting antenna at the top of a tower has a height 18 m and the height of the receiving antenna is 32 m. What is the maximum distance between them for satisfactory communication in line-of-sight mode? Given radius of earth is 6.4 × 106 m
Brief exposure to the sound of minimum can damage ear drums of humans.
The graph showing correct variation of photo current with intensity of incident light:
Which of the following graph correctly shows the relation between photoelectric current (I) and wavelength (λ) of incident radiation
Match List I with List II

List-I

List-II

(A)To slow down fast moving neutrons(I)Thermal neutrons
(B)A neutron or a proton(II)Fission
(C)Slow neutrons(III)Moderator
(D)Neutron induced nuclear reaction(IV)Nucleon

Choose the correct answer from the options given below:
Which of the following statements are correct for a transistor action ?
(A) The input resistance depends upon the current IC in the transistor
(B) Collector currents is equal to the sum of base current and emitter current
(C) The emitter junction is forward biased
(D) The collector junction is reverse biased
(E) Both the emitter junction as well as the collector junction are forward biased
Choose the correct answer from the options given below:
Who among the following in Ancient India made some prominent discoveries in Physics?
Match LIST I with LIST II

LIST I
Device

LIST II 
Purpose
AMicrophoneIUsed in vehicles to measure distance
BAudiometerIIFor measuring the force and velocity of
wind
C OdometerIIIConverts sound waves to electrical vibrations
DAnemometer IVMeasures intensity of sound
Choose the most appropriate answer from the options given below:
Match List I with List II
List IList II
(A) Rn22286 → Po21884(III) α particle
(B) Bi21483 → Po21484(I) β− particle
(C) Th23490 → U23492(I) β− particle
(D) Na2211 → Na2210(II) β+ particle
Identify the logic operation carried out by the following circuit.
logic operation carried out
Mobility of electrons
\(lim _{n→∞}{(2^½-2^½)(2^½-2^½)….(2^½-^2{\frac{1}{2n+1}})}\) is equal to
Let B =\(\begin{bmatrix} 1 & 3 & α \\ 1 & 2& 3 \\ α & α & 4 \end{bmatrix}\) , α>2 be the adjoint of a matrix A and |A| = 2, then [α - 2α α] B\(\begin{bmatrix} α \\ -2α  \\ α \end{bmatrix}\)is equal to
Among the two statements
(S1) : (p ⇒ q)∧(q ∧(~q)) is a contradiction and  
(S2) : (p∧q) v ((~p)∧q) v (p ∧ (~q)) v ((~p) ∧ (~q)) is a tautology 
The number of five-digit numbers, greater than 40000 and divis ible by 5, which can be formed using the digits 0, 1, 3, 5, 7, and 9 without repetition, is equal to:
What is the correct order of acidity of compounds I, II and III?
i. 4-Nitrobenzoic acid 
ii. 4-Methoxy Benzoic acid
iii. Benzoic acid
Which base is not found in DNA?
polyethylene-glycol is used in the preparation of which types of detergent?
Which of the following statemnt is incorect for physisorption?
Which of the following are peroxo acids of sulpher?
What is the de Broglie wavelength associated with an electron accelerated through a potential difference of 64 volts?
Which one of the following elements will remain as liquid inside pure boiling water?

Gadolinium has a low value of third ionisation enthalpy because of

The stability of \(Cu^{2+}\) is more than \(Cu^+\) salts in aqueous solution due to
The alkaline earth metal with lowest density is