വജ്രത്തിൻറെ തിളക്കത്തിന് കാരണം എന്ത്

- Aഅപവർത്തനം
- Bപ്രകീർണനം
- Cആന്തരിക പ്രതിഫലനം
- Dവിസരണം

തീ പിടിച്ചാൽ ഒരു വസ്തുവിനുണ്ടാകുന്ന മാറ്റം എന്താണെന്ന് അറിയാനായി സ്വന്തം വീടിൻറെ ധാന്യപ്പുരയ്ക്ക് തീയിട്ട ശാസ്ത്രജ്ഞൻ ആര്

- Aതോമസ് ആൽവാ എഡിസൺ
- Bഐൻസ്റ്റീൻ
- Cഐസക് ന്യൂട്ടൺ
- Dഅർക്കമിഡീസ്

ഒരു ഘൂർണ്ണന ചലനത്തിന് ഉദാഹരണം എന്ത്

- Aസീസോയുടെ ചലനം
- Bമൺപാത്ര നിർമാണത്തിന് ഉപയോഗിക്കുന്ന ചക്രത്തിൻറെ കറക്കം
- Cക്ലോക്കിലെ പെൻഡുലത്തിന്റെ ചലനം
- Dതരംഗ ചലനം

A rod of weight W is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The knives are at a distance d from each other. The centre of mass of the rod is at distance x from A. The normal reaction on A is :-

- AWd/x
- BW(d-x)/x
- CW(d-x)/d
- DWx/d
**Explanation:**

A ship A is moving Westwards with a speed of 10 km h1 and a ship B 100 km South of A, is moving Northwards with a speed of 10 km h1. The time after which the distance between them becomes shortest, is :-

- A5 h
- B5 √2h
- C10 √2 h
- D0 h
**Explanation:**

Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

- A
- B
- C
- D
**Explanation:**

A particle of mass m is driven by a machine that delivers a constant power k watts. If the particle starts from rest the force on the particle at time t is :

- A√mk t
^{-1/2} - B√mk t
^{-1/2} - C1/2√mk t
^{-1/2} - D√mk/2 t
^{-1/2} **Explanation:**

A conducting square frame of side 'a' and a long straight wire carrying current I are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity 'V'. The emf induced in the frame will be proportional to :

- A1/(2x-a)
^{2} - B1/(2x+a)
^{2} - C1/(2x-a)(2x+a)
- D1/x
^{2} **Explanation:**

Two similar springs P and Q have spring constants K

_{P}and K_{Q}, such that K_{P}> K_{Q}. The are stretched, first by the same amount (case a,) then by the same force (case b). The work done by the springs W_{P}and W_{Q}are related as, in case (a) and case (b), respectively :- AW
_{P}= W_{Q}; W_{P}= W_{Q} - BW
_{P}> W_{Q}; W_{Q}> W_{P} - CW
_{P}< W_{Q}; W_{Q}< W_{P} - DW
_{P}= W_{Q}; W_{P}> W_{Q} **Explanation:**

The two ends of a metal rod are matainted at temperatures 100°C and 110°C. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200°C and 210°C, the rate of heat flow will be :

- A16.8 J/s
- B8.0 J/s
- C4.0 J/s
- D44.0 J/s
**Explanation:**

The electeric field in a certain region is acting radially outward and is given by E = Ar.A charge contained in a shepere of radius 'a' centred at the origin of the field, will be given by :

- AA ε
_{0}a^{2} - B4 πε
_{0}Aa^{3} - Cε
_{0}Aa^{3} - D4 πε
_{0}Aa^{2} **Explanation:**

Three identical spherical shells, each of mass m and radius r are placed as shown in figure. Consider an axis XX' which is touching to two shells and passing through diameter of third shell. Moment of inertia of the system consisting of these three spherical shells about XX' axis is :-

- A3mr
^{2} - B16/5mr
^{2} - C4mr
^{2} - D11/5mr
^{2} **Explanation:**

A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are V

_{A}, V_{B}and V respectively. Then :- AV
^{A}≠ V^{B}= V^{C} - BV
^{A}=V^{B}≠V^{C} - CV
^{A}≠V^{B}≠V^{C} - DV
^{A}=V^{B}=V^{C} **Explanation:**

Three blocks A, B and C of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on

the 4 kg block, then the contact force between A and B is :- A6 N
- B8 N
- C18 N
- D2 N
**Explanation:**

If energy (E), velocity (V) and time (T) are chosen as the fundamental quantities, the dimensional formula of surface tension will be :

- A[EV
^{-1}T^{-2}] - B[EV
^{-2}T^{-2}] - C[E
^{-2}V^{-1}T^{-3}] - DEV
^{-2}T-1] **Explanation:**

Figure below shows two paths that may be taken by a gas to go from a state A to a state C.

- A500 J
- B460 J
- C300 J
- D380 J
**Explanation:**

The ratio of the specific heats C

_{p}/C_{v}=λ in terms of degrees of freedom (n) is given by :- A[1+n/3]
- B[1+2/n]
- C[1+n/2]
- D[1+1/n]
**Explanation:**λ = 1+2/n

Here degree of freedom = n

λ = 1+2/n

A resitance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes 'Z', the power drawn will be :

- AP√R/Z
- BP[R/Z]
- CP
- DP[R/Z]
^{2} **Explanation:**

Two spherical bodies of mass M and 5 M and radiiR and 2 R are released in free space with initialseparation between their centres equal to 12 R. If they attract each other due to gravitational forceonly, then the distance covered by the smaller body before collision is :

- A4.5 R
- B7.5 R
- C1.5 R
- D2.5 R
**Explanation:**

Two identical thin plano-convex glass lenses

(refractive index 1.5) each having radius of

curvature of 20 cm are placed with their convex

surfaces in contact at the centre. The intervening

space is filled with oil of refractive index 1.7. The

focal length of the combination is :-- A25 cm
- B50 cm
- C50 cm
- D20 cm
**Explanation:**

A mass m moves in a circle on a smooth horizontal

plane with velocity v0 at a radius R0. The mass is

attached to a string which passes through a smooth

hole in the plane as shown.The tension in the string is increased gradually and

finally m moves in a circle of radius R_{0}/2.The final

value of the kinetic energy is :-- A1/4 mv
^{2}_{0} - B2 mv
^{2}_{0} - C1/2 mv
^{2}_{0} - Dmv
^{2}_{0} **Explanation:**

A radiation of energy E falls normally on a perfectly

reflecting surface. The momentum transferred to

the surface is (C = Velocity of light) :-- A2E/ C
- B2E/ C
^{2} - CE/ C
^{2} - DE/ C
**Explanation:**

A Carnot engine, having an efficiency of n = 1/10 as

heat engine, is used as a refrigerator. If the work

done on the system is 10 J, the amount of energy

absorbed from the reservoir at lower temperature is- A99 J
- B90 J
- C1 J
- D100 J
**Explanation:**

Which logic gate is represented by the following

combination of logic gates ?- ANAND
- BAND
- CNOR
- DOR
**Explanation:**

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